/* ============================================================
   Split Bill — Design System
   Multi-theme (dark/light), Lucide icons, modern glassmorphism
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Outfit:wght@400;500;600;700;800&display=swap');

/* ── Dark Theme (default) ── */
[data-theme="dark"], :root {
  /* Brand Colors */
  --color-primary: #00C853;
  --color-primary-light: #69F0AE;
  --color-primary-dark: #009624;
  --color-secondary: #FFD600;
  --color-secondary-light: #FFFF52;
  --color-secondary-dark: #C7A500;
  --color-accent: #2979FF;
  --color-accent-light: #75A7FF;

  /* Surfaces */
  --bg-primary: #0A0E17;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.8);
  --bg-card-hover: rgba(25, 35, 55, 0.9);
  --bg-glass: rgba(255, 255, 255, 0.05);
  --bg-glass-hover: rgba(255, 255, 255, 0.08);
  --bg-input: rgba(255, 255, 255, 0.06);
  --bg-input-focus: rgba(255, 255, 255, 0.1);

  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.12);
  --border-focus: var(--color-primary);

  /* Text */
  --text-primary: #F9FAFB;
  --text-secondary: #9CA3AF;
  --text-tertiary: #6B7280;
  --text-inverse: #0A0E17;

  /* Semantic Colors */
  --color-success: #00E676;
  --color-warning: #FFD600;
  --color-error: #FF5252;
  --color-info: #448AFF;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #00C853 0%, #00E676 50%, #69F0AE 100%);
  --gradient-hero: linear-gradient(135deg, #00C853 0%, #FFD600 100%);
  --gradient-card: linear-gradient(145deg, rgba(0, 200, 83, 0.08) 0%, rgba(255, 214, 0, 0.04) 100%);
  --gradient-bg: radial-gradient(ellipse at 20% 50%, rgba(0, 200, 83, 0.12) 0%, transparent 50%),
                 radial-gradient(ellipse at 80% 20%, rgba(255, 214, 0, 0.08) 0%, transparent 50%),
                 radial-gradient(ellipse at 50% 80%, rgba(41, 121, 255, 0.06) 0%, transparent 50%);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow-green: 0 0 20px rgba(0, 200, 83, 0.3), 0 0 60px rgba(0, 200, 83, 0.1);
  --shadow-glow-yellow: 0 0 20px rgba(255, 214, 0, 0.2), 0 0 60px rgba(255, 214, 0, 0.05);
  --color-primary-soft: rgba(0, 200, 83, 0.12);
  --color-primary-softer: rgba(0, 200, 83, 0.08);
  --color-primary-focus-ring: rgba(0, 200, 83, 0.15);
  --color-primary-border-strong: rgba(0, 200, 83, 0.3);
  --color-primary-border-soft: rgba(0, 200, 83, 0.2);
  --color-primary-surface: rgba(0, 200, 83, 0.1);
  --text-accent: var(--color-primary-light);
  --surface-accent-bg: rgba(0, 200, 83, 0.1);
  --surface-accent-border: rgba(0, 200, 83, 0.2);

  --header-bg: rgba(10, 14, 23, 0.8);
  --modal-bg: var(--bg-secondary);
  --scrollbar-thumb: var(--border-medium);
}

/* ── Light Theme ── */
[data-theme="light"] {
  --bg-primary: #F8FAFC;
  --bg-secondary: #FFFFFF;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --bg-glass: rgba(15, 23, 42, 0.04);
  --bg-glass-hover: rgba(15, 23, 42, 0.075);
  --bg-input: rgba(15, 23, 42, 0.045);
  --bg-input-focus: rgba(15, 23, 42, 0.07);

  --border-subtle: rgba(15, 23, 42, 0.12);
  --border-medium: rgba(15, 23, 42, 0.18);

  --text-primary: #111827;
  --text-secondary: #4B5563;
  --text-tertiary: #6B7280;
  --text-inverse: #FFFFFF;

  --color-primary: #009624;
  --color-primary-light: #00C853;
  --color-primary-dark: #006B1D;

  --gradient-card: linear-gradient(145deg, rgba(0, 200, 83, 0.06) 0%, rgba(255, 214, 0, 0.03) 100%);
  --gradient-bg: radial-gradient(ellipse at 20% 50%, rgba(0, 200, 83, 0.06) 0%, transparent 50%),
                 radial-gradient(ellipse at 80% 20%, rgba(255, 214, 0, 0.04) 0%, transparent 50%);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-glow-green: 0 0 20px rgba(0, 200, 83, 0.15), 0 0 60px rgba(0, 200, 83, 0.05);
  --color-primary-soft: rgba(0, 200, 83, 0.1);
  --color-primary-softer: rgba(0, 200, 83, 0.06);
  --color-primary-focus-ring: rgba(0, 200, 83, 0.15);
  --color-primary-border-strong: rgba(0, 200, 83, 0.28);
  --color-primary-border-soft: rgba(0, 200, 83, 0.2);
  --color-primary-surface: rgba(0, 200, 83, 0.1);
  --text-accent: var(--color-primary-dark);
  --surface-accent-bg: rgba(0, 200, 83, 0.12);
  --surface-accent-border: rgba(0, 200, 83, 0.22);

  --header-bg: rgba(248, 250, 252, 0.94);
  --modal-bg: #FFFFFF;
  --scrollbar-thumb: rgba(0, 0, 0, 0.15);
}

/* ── Locale Themes ── */
[data-theme="dark"][data-locale="ja"] {
  --color-primary: #2563EB;
  --color-primary-light: #7DD3FC;
  --color-primary-dark: #1D4ED8;
  --color-secondary: #F59E0B;
  --color-secondary-light: #FCD34D;
  --color-secondary-dark: #D97706;
  --color-accent: #F97316;
  --color-accent-light: #FDBA74;
  --gradient-primary: linear-gradient(135deg, #2563EB 0%, #38BDF8 55%, #7DD3FC 100%);
  --gradient-hero: linear-gradient(135deg, #2563EB 0%, #F59E0B 100%);
  --gradient-card: linear-gradient(145deg, rgba(37, 99, 235, 0.1) 0%, rgba(245, 158, 11, 0.05) 100%);
  --gradient-bg: radial-gradient(ellipse at 20% 50%, rgba(37, 99, 235, 0.18) 0%, transparent 50%),
                 radial-gradient(ellipse at 80% 18%, rgba(245, 158, 11, 0.1) 0%, transparent 48%),
                 radial-gradient(ellipse at 55% 80%, rgba(56, 189, 248, 0.09) 0%, transparent 50%);
  --shadow-glow-green: 0 0 20px rgba(37, 99, 235, 0.28), 0 0 60px rgba(37, 99, 235, 0.1);
  --shadow-glow-yellow: 0 0 20px rgba(245, 158, 11, 0.2), 0 0 60px rgba(245, 158, 11, 0.06);
  --color-primary-soft: rgba(37, 99, 235, 0.12);
  --color-primary-softer: rgba(37, 99, 235, 0.08);
  --color-primary-focus-ring: rgba(37, 99, 235, 0.16);
  --color-primary-border-strong: rgba(37, 99, 235, 0.3);
  --color-primary-border-soft: rgba(37, 99, 235, 0.22);
  --color-primary-surface: rgba(37, 99, 235, 0.1);
}

[data-theme="light"][data-locale="ja"] {
  --color-primary: #1D4ED8;
  --color-primary-light: #2563EB;
  --color-primary-dark: #1E40AF;
  --color-secondary: #F59E0B;
  --color-secondary-light: #FCD34D;
  --color-secondary-dark: #D97706;
  --color-accent: #F97316;
  --color-accent-light: #FDBA74;
  --gradient-primary: linear-gradient(135deg, #1D4ED8 0%, #2563EB 52%, #7DD3FC 100%);
  --gradient-hero: linear-gradient(135deg, #1D4ED8 0%, #F59E0B 100%);
  --gradient-card: linear-gradient(145deg, rgba(37, 99, 235, 0.08) 0%, rgba(245, 158, 11, 0.04) 100%);
  --gradient-bg: radial-gradient(ellipse at 20% 50%, rgba(37, 99, 235, 0.07) 0%, transparent 50%),
                 radial-gradient(ellipse at 80% 20%, rgba(245, 158, 11, 0.05) 0%, transparent 50%);
  --shadow-glow-green: 0 0 20px rgba(37, 99, 235, 0.14), 0 0 60px rgba(37, 99, 235, 0.04);
  --shadow-glow-yellow: 0 0 20px rgba(245, 158, 11, 0.14), 0 0 60px rgba(245, 158, 11, 0.04);
  --color-primary-soft: rgba(37, 99, 235, 0.1);
  --color-primary-softer: rgba(37, 99, 235, 0.08);
  --color-primary-focus-ring: rgba(37, 99, 235, 0.16);
  --color-primary-border-strong: rgba(37, 99, 235, 0.28);
  --color-primary-border-soft: rgba(37, 99, 235, 0.2);
  --color-primary-surface: rgba(37, 99, 235, 0.1);
}

[data-theme="dark"][data-locale="pt-BR"] {
  --color-primary: #00C853;
  --color-primary-light: #69F0AE;
  --color-primary-dark: #009624;
  --color-secondary: #FFD600;
  --color-secondary-light: #FFF176;
  --color-secondary-dark: #C7A500;
  --color-accent: #2979FF;
  --color-accent-light: #75A7FF;
}

[data-theme="light"][data-locale="pt-BR"] {
  --color-primary: #009624;
  --color-primary-light: #00C853;
  --color-primary-dark: #006B1D;
  --color-secondary: #FFD600;
  --color-secondary-light: #FFF176;
  --color-secondary-dark: #C7A500;
  --color-accent: #2979FF;
  --color-accent-light: #75A7FF;
  --gradient-primary: linear-gradient(135deg, #009624 0%, #00C853 52%, #69F0AE 100%);
  --gradient-hero: linear-gradient(135deg, #009624 0%, #FFD600 100%);
  --gradient-card: linear-gradient(145deg, rgba(0, 200, 83, 0.06) 0%, rgba(255, 214, 0, 0.03) 100%);
  --gradient-bg: radial-gradient(ellipse at 20% 50%, rgba(0, 200, 83, 0.06) 0%, transparent 50%),
                 radial-gradient(ellipse at 80% 20%, rgba(255, 214, 0, 0.04) 0%, transparent 50%);
  --shadow-glow-green: 0 0 20px rgba(0, 200, 83, 0.15), 0 0 60px rgba(0, 200, 83, 0.05);
  --shadow-glow-yellow: 0 0 20px rgba(255, 214, 0, 0.14), 0 0 60px rgba(255, 214, 0, 0.04);
}

[data-theme="dark"][data-locale="es-MX"] {
  --color-primary: #FF6B35;
  --color-primary-light: #FDBA74;
  --color-primary-dark: #EA580C;
  --color-secondary: #0F766E;
  --color-secondary-light: #5EEAD4;
  --color-secondary-dark: #115E59;
  --color-accent: #EAB308;
  --color-accent-light: #FDE68A;
  --gradient-primary: linear-gradient(135deg, #FF6B35 0%, #F97316 52%, #FDBA74 100%);
  --gradient-hero: linear-gradient(135deg, #FF6B35 0%, #0F766E 100%);
  --gradient-card: linear-gradient(145deg, rgba(255, 107, 53, 0.1) 0%, rgba(15, 118, 110, 0.05) 100%);
  --gradient-bg: radial-gradient(ellipse at 18% 50%, rgba(255, 107, 53, 0.18) 0%, transparent 50%),
                 radial-gradient(ellipse at 82% 20%, rgba(15, 118, 110, 0.12) 0%, transparent 48%),
                 radial-gradient(ellipse at 55% 82%, rgba(234, 179, 8, 0.08) 0%, transparent 50%);
  --shadow-glow-green: 0 0 20px rgba(255, 107, 53, 0.26), 0 0 60px rgba(255, 107, 53, 0.09);
  --shadow-glow-yellow: 0 0 20px rgba(15, 118, 110, 0.18), 0 0 60px rgba(15, 118, 110, 0.05);
  --color-primary-soft: rgba(255, 107, 53, 0.12);
  --color-primary-softer: rgba(255, 107, 53, 0.08);
  --color-primary-focus-ring: rgba(255, 107, 53, 0.16);
  --color-primary-border-strong: rgba(255, 107, 53, 0.3);
  --color-primary-border-soft: rgba(255, 107, 53, 0.22);
  --color-primary-surface: rgba(255, 107, 53, 0.1);
}

[data-theme="light"][data-locale="es-MX"] {
  --color-primary: #EA580C;
  --color-primary-light: #F97316;
  --color-primary-dark: #C2410C;
  --color-secondary: #0F766E;
  --color-secondary-light: #5EEAD4;
  --color-secondary-dark: #115E59;
  --color-accent: #EAB308;
  --color-accent-light: #FDE68A;
  --gradient-primary: linear-gradient(135deg, #EA580C 0%, #F97316 52%, #FDBA74 100%);
  --gradient-hero: linear-gradient(135deg, #EA580C 0%, #0F766E 100%);
  --gradient-card: linear-gradient(145deg, rgba(255, 107, 53, 0.08) 0%, rgba(15, 118, 110, 0.04) 100%);
  --gradient-bg: radial-gradient(ellipse at 20% 50%, rgba(255, 107, 53, 0.08) 0%, transparent 50%),
                 radial-gradient(ellipse at 80% 20%, rgba(15, 118, 110, 0.05) 0%, transparent 50%);
  --shadow-glow-green: 0 0 20px rgba(255, 107, 53, 0.14), 0 0 60px rgba(255, 107, 53, 0.04);
  --shadow-glow-yellow: 0 0 20px rgba(15, 118, 110, 0.14), 0 0 60px rgba(15, 118, 110, 0.04);
  --color-primary-soft: rgba(255, 107, 53, 0.1);
  --color-primary-softer: rgba(255, 107, 53, 0.08);
  --color-primary-focus-ring: rgba(255, 107, 53, 0.16);
  --color-primary-border-strong: rgba(255, 107, 53, 0.28);
  --color-primary-border-soft: rgba(255, 107, 53, 0.2);
  --color-primary-surface: rgba(255, 107, 53, 0.1);
}

[data-theme="dark"][data-locale="vi"] {
  --color-primary: #EF4444;
  --color-primary-light: #FCA5A5;
  --color-primary-dark: #DC2626;
  --color-secondary: #F59E0B;
  --color-secondary-light: #FDE68A;
  --color-secondary-dark: #D97706;
  --color-accent: #FB7185;
  --color-accent-light: #FDA4AF;
  --gradient-primary: linear-gradient(135deg, #EF4444 0%, #F97316 52%, #FCA5A5 100%);
  --gradient-hero: linear-gradient(135deg, #EF4444 0%, #F59E0B 100%);
  --gradient-card: linear-gradient(145deg, rgba(239, 68, 68, 0.1) 0%, rgba(245, 158, 11, 0.05) 100%);
  --gradient-bg: radial-gradient(ellipse at 18% 50%, rgba(239, 68, 68, 0.18) 0%, transparent 50%),
                 radial-gradient(ellipse at 82% 18%, rgba(245, 158, 11, 0.11) 0%, transparent 48%),
                 radial-gradient(ellipse at 55% 82%, rgba(251, 113, 133, 0.08) 0%, transparent 50%);
  --shadow-glow-green: 0 0 20px rgba(239, 68, 68, 0.24), 0 0 60px rgba(239, 68, 68, 0.08);
  --shadow-glow-yellow: 0 0 20px rgba(245, 158, 11, 0.2), 0 0 60px rgba(245, 158, 11, 0.05);
  --color-primary-soft: rgba(239, 68, 68, 0.12);
  --color-primary-softer: rgba(239, 68, 68, 0.08);
  --color-primary-focus-ring: rgba(239, 68, 68, 0.16);
  --color-primary-border-strong: rgba(239, 68, 68, 0.3);
  --color-primary-border-soft: rgba(239, 68, 68, 0.22);
  --color-primary-surface: rgba(239, 68, 68, 0.1);
}

[data-theme="light"][data-locale="vi"] {
  --color-primary: #DC2626;
  --color-primary-light: #EF4444;
  --color-primary-dark: #B91C1C;
  --color-secondary: #F59E0B;
  --color-secondary-light: #FDE68A;
  --color-secondary-dark: #D97706;
  --color-accent: #FB7185;
  --color-accent-light: #FDA4AF;
  --gradient-primary: linear-gradient(135deg, #DC2626 0%, #EF4444 52%, #FCA5A5 100%);
  --gradient-hero: linear-gradient(135deg, #DC2626 0%, #F59E0B 100%);
  --gradient-card: linear-gradient(145deg, rgba(239, 68, 68, 0.08) 0%, rgba(245, 158, 11, 0.04) 100%);
  --gradient-bg: radial-gradient(ellipse at 20% 50%, rgba(239, 68, 68, 0.08) 0%, transparent 50%),
                 radial-gradient(ellipse at 80% 20%, rgba(245, 158, 11, 0.05) 0%, transparent 50%);
  --shadow-glow-green: 0 0 20px rgba(239, 68, 68, 0.14), 0 0 60px rgba(239, 68, 68, 0.04);
  --shadow-glow-yellow: 0 0 20px rgba(245, 158, 11, 0.14), 0 0 60px rgba(245, 158, 11, 0.04);
  --color-primary-soft: rgba(239, 68, 68, 0.1);
  --color-primary-softer: rgba(239, 68, 68, 0.08);
  --color-primary-focus-ring: rgba(239, 68, 68, 0.16);
  --color-primary-border-strong: rgba(239, 68, 68, 0.28);
  --color-primary-border-soft: rgba(239, 68, 68, 0.2);
  --color-primary-surface: rgba(239, 68, 68, 0.1);
}

/* ── Shared Variables ── */
:root {
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --font-display: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  --z-dropdown: 100;
  --z-modal-backdrop: 200;
  --z-modal: 300;
  --z-toast: 400;
}

/* ── Reset & Base ── */
*, *::before, *::after {
  margin: 0; padding: 0; box-sizing: border-box;
}

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-base), color var(--transition-base);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: var(--gradient-bg);
  z-index: -1;
  pointer-events: none;
  transition: background var(--transition-slow);
}

a {
  color: var(--text-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-primary); }

img { max-width: 100%; height: auto; display: block; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* ── Lucide Icons ── */
.lucide-icon {
  width: 1em;
  height: 1em;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  vertical-align: -0.125em;
  flex-shrink: 0;
}

.lucide-icon--sm { width: 0.875em; height: 0.875em; }
.lucide-icon--lg { width: 1.25em; height: 1.25em; }
.lucide-icon--xl { width: 1.5em; height: 1.5em; }

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.25rem; }

.text-gradient {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-lg { font-size: 1.125rem; }

/* ── Layout ── */
.container { width: 100%; max-width: 680px; margin: 0 auto; padding: 0 var(--space-lg); }
.container--wide { max-width: 1100px; }

.page { min-height: 100vh; display: flex; flex-direction: column; }
.page-content { flex: 1; padding: var(--space-xl) 0; }

/* ── Header ── */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-base);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) 0;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--text-primary);
  text-decoration: none;
}

.header__logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--text-inverse);
  box-shadow: var(--shadow-glow-green);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.header__nav > .btn--primary {
  margin-left: var(--space-xs);
}

.header-utility {
  min-height: 2.25rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-md);
  gap: 0.55rem;
  flex-shrink: 0;
}

.header-utility .lucide-icon {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.header-utility span:not(.sr-only) {
  line-height: 1;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(255,255,255,0.2), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.btn:hover::after { opacity: 1; }
.btn:active { transform: scale(0.97); }

.btn--primary {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-glow-green);
}
.btn--primary:hover {
  box-shadow: var(--shadow-glow-green);
  transform: translateY(-1px);
}
.btn--secondary {
  background: var(--bg-glass);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  backdrop-filter: blur(10px);
}
.btn--secondary:hover {
  background: var(--bg-glass-hover);
  border-color: var(--color-primary);
}
.btn--ghost {
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
}
.btn--ghost:hover {
  color: var(--text-primary);
  background: var(--bg-glass);
}
.btn--danger {
  background: rgba(255, 82, 82, 0.15);
  color: var(--color-error);
  border: 1px solid rgba(255, 82, 82, 0.2);
}
.btn--danger:hover { background: rgba(255, 82, 82, 0.25); }

.btn--sm { padding: 0.4rem 0.8rem; font-size: 0.85rem; border-radius: var(--radius-sm); }
.btn--lg { padding: 1rem 2.5rem; font-size: 1.15rem; border-radius: var(--radius-lg); }
.btn--full { width: 100%; }
.btn--icon { width: 2.5rem; height: 2.5rem; padding: 0; border-radius: var(--radius-md); font-size: 1.1rem; }

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all var(--transition-base);
}
.card:hover { border-color: var(--border-medium); }
.card--glow { background: var(--gradient-card); }
.card--glow:hover {
  box-shadow: var(--shadow-glow-green);
  border-color: var(--color-primary-border-soft);
}
.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}
.card__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* ── Forms ── */
.form-group { margin-bottom: var(--space-lg); }
.form-label {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}
.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
}
.form-input:focus {
  outline: none;
  background: var(--bg-input-focus);
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-focus-ring);
}
.form-input::placeholder { color: var(--text-tertiary); }

.currency-input {
  position: relative;
}

.currency-input__field {
  width: 100%;
}

.currency-input__affix {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  font-weight: 600;
  pointer-events: none;
  white-space: nowrap;
}

.currency-input__affix--prefix {
  left: 1rem;
}

.currency-input__affix--suffix {
  right: 1rem;
}

.currency-input--prefix .currency-input__field {
  padding-left: 3.4rem;
}

.currency-input--suffix .currency-input__field {
  padding-right: 3.8rem;
}

input[type="number"] {
  -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239CA3AF' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}
.form-select:focus {
  outline: none;
  background-color: var(--bg-input-focus);
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-focus-ring);
}

/* ── Radio Group (Split Mode) ── */
.radio-group { display: flex; flex-direction: column; gap: var(--space-sm); }
.radio-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.6rem var(--space-md);
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.radio-item:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-medium);
}
.radio-item.active {
  background: var(--color-primary-softer);
  border-color: var(--color-primary);
}
.radio-item input[type="radio"] {
  appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-medium);
  border-radius: 50%;
  position: relative;
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}
.radio-item input[type="radio"]:checked {
  border-color: var(--color-primary);
  background: var(--color-primary);
}
.radio-item input[type="radio"]:checked::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 6px; height: 6px;
  border-radius: 50%;
  background: white;
}
.radio-item__label {
  font-weight: 500;
  font-size: 0.9rem;
}
.radio-item__sub {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.split-config {
  margin-top: var(--space-sm);
  padding: var(--space-md);
  background: var(--bg-glass);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}
.split-config__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  font-weight: 600;
  color: var(--text-primary);
}

/* ── Member Tags ── */
.member-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1;
  transition: all var(--transition-fast);
  cursor: default;
  border: 1.5px solid transparent;
}
.member-tag--interactive { cursor: pointer; }
.member-tag--interactive:hover { transform: scale(1.05); }
.member-tag__dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.member-tag--selected { border-color: currentColor; }
.member-tag--unselected { opacity: 0.4; }

/* ── Ratio Bar ── */
.ratio-bar {
  width: 100%;
  height: 10px;
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  overflow: hidden;
  display: flex;
}
.ratio-bar__segment {
  height: 100%;
  transition: width var(--transition-slow);
}
.ratio-bar__segment:first-child { border-radius: var(--radius-full) 0 0 var(--radius-full); }
.ratio-bar__segment:last-child { border-radius: 0 var(--radius-full) var(--radius-full) 0; }
.ratio-bar__segment:only-child { border-radius: var(--radius-full); }
.ratio-bar--lg { height: 16px; }

/* ── Expense List ── */
.expense-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: color-mix(in srgb, var(--bg-glass) 84%, transparent);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  position: relative;
}
.expense-item:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-sm);
}
.expense-item__icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
}
.expense-item__content { min-width: 0; }
.expense-item__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
}
.expense-item__title {
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.35;
  margin-bottom: 0.15rem;
}
.expense-item__meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: 0.2rem;
}
.expense-item__payer-tag {
  font-size: 0.72rem;
  padding: 0.15rem 0.45rem;
}
.expense-item__target {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  min-width: 0;
}
.expense-item__submeta {
  margin-top: 0.35rem;
  font-size: 0.74rem;
  color: var(--text-tertiary);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}
.expense-item__submeta span {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}
.expense-item__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.45rem;
}
.expense-mode-badge {
  display: inline-flex;
  align-items: center;
  min-height: 1.65rem;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-soft);
  color: var(--text-accent);
  border: 1px solid var(--color-primary-border-soft);
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.2;
}
.expense-mode-badge--subtle {
  background: var(--bg-glass);
  color: var(--text-secondary);
  border-color: var(--border-subtle);
}
.expense-item__amount {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-accent);
  text-align: right;
  flex-shrink: 0;
}
.expense-item__actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  opacity: 1;
  transition: opacity var(--transition-fast);
}

/* ── Settlement Cards ── */
.settlement-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--gradient-card);
  border: 1px solid var(--color-primary-soft);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}
.settlement-item:hover {
  border-color: var(--color-primary-border-strong);
  box-shadow: var(--shadow-glow-green);
}
.settlement-item__arrow {
  display: flex; align-items: center; gap: var(--space-sm); flex: 1;
}
.settlement-item__arrow-icon { color: var(--color-primary); font-size: 1.2rem; }
.settlement-item__amount {
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.25rem;
  color: var(--text-accent);
}

/* ── Modal ── */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: var(--z-modal-backdrop);
  display: flex; align-items: center; justify-content: center;
  padding: var(--space-lg);
  opacity: 0; visibility: hidden;
  transition: all var(--transition-base);
}
.modal-backdrop.active { opacity: 1; visibility: visible; }
.modal {
  background: var(--modal-bg);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  max-width: 480px; width: 100%; max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-spring);
}
.modal-backdrop.active .modal { transform: scale(1) translateY(0); }
.modal__header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: var(--space-xl);
}
.modal__title {
  font-family: var(--font-display);
  font-size: 1.25rem; font-weight: 700;
  display: flex; align-items: center; gap: var(--space-sm);
}
.modal__close {
  width: 2rem; height: 2rem;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.modal__close:hover { background: var(--bg-glass); color: var(--text-primary); }

/* ── Toast ── */
.toast-container {
  position: fixed;
  bottom: var(--space-xl); right: var(--space-xl);
  z-index: var(--z-toast);
  display: flex; flex-direction: column; gap: var(--space-sm);
}
.toast {
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  font-size: 0.9rem;
  display: flex; align-items: center; gap: var(--space-sm);
  box-shadow: var(--shadow-lg);
  animation: slideInRight var(--transition-spring) forwards;
  max-width: 360px;
}
.toast--success { border-color: rgba(0, 230, 118, 0.3); background: rgba(0, 230, 118, 0.1); }
.toast--error { border-color: rgba(255, 82, 82, 0.3); background: rgba(255, 82, 82, 0.1); }

/* ── Section Divider ── */
.section-divider {
  display: flex; align-items: center; gap: var(--space-md);
  margin: var(--space-xl) 0;
}
.section-divider__line { flex: 1; height: 1px; background: var(--border-subtle); }
.section-divider__text {
  font-family: var(--font-display);
  font-size: 0.85rem; font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex; align-items: center; gap: var(--space-xs);
}
.toolbar-menu {
  position: relative;
  flex-shrink: 0;
}
.toolbar-menu__trigger {
  min-width: 2.75rem;
  justify-content: center;
  gap: var(--space-xs);
}
.toolbar-menu__trigger-label {
  line-height: 1;
}
.toolbar-menu__panel {
  position: absolute;
  top: calc(100% + 0.45rem);
  right: 0;
  min-width: 140px;
  padding: 0.35rem;
  border-radius: var(--radius-md);
  background: var(--modal-bg);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-lg);
  z-index: 20;
}
.toolbar-menu__item {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-align: center;
  transition: all var(--transition-fast);
}
.toolbar-menu__item:hover {
  background: var(--bg-glass);
  color: var(--text-primary);
}
.toolbar-menu__item--active {
  background: var(--surface-accent-bg);
  color: var(--text-accent);
}

/* ── Checkbox ── */
.checkbox-item {
  display: flex; align-items: center; gap: var(--space-sm);
  cursor: pointer; padding: 0.4rem 0;
}
.checkbox-item input[type="checkbox"] {
  appearance: none;
  width: 20px; height: 20px;
  border: 2px solid var(--border-medium);
  border-radius: 5px;
  transition: all var(--transition-fast);
  position: relative;
  cursor: pointer; flex-shrink: 0;
}
.checkbox-item input[type="checkbox"]:checked {
  background: var(--color-primary);
  border-color: var(--color-primary);
}
.checkbox-item input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-inverse);
  font-size: 0.75rem; font-weight: 700;
}

/* ── Templates ── */
.template-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: var(--space-sm);
}
.template-chip {
  display: flex; flex-direction: column;
  align-items: center; gap: 0.25rem;
  padding: 0.6rem;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}
.template-chip:hover {
  background: var(--bg-glass-hover);
  border-color: var(--color-primary);
  color: var(--text-primary);
  transform: translateY(-2px);
}
.template-chip.active {
  background: var(--surface-accent-bg);
  border-color: var(--color-primary);
  color: var(--text-accent);
}
.template-chip__icon { font-size: 1.3rem; display: flex; align-items: center; justify-content: center; }
.custom-split-summary {
  margin-bottom: var(--space-md);
  font-size: 0.84rem;
  font-weight: 600;
}
.custom-split-summary--ok { color: var(--color-success); }
.custom-split-summary--error { color: var(--color-error); }
.custom-split-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}
.custom-split-row__input {
  flex: 1;
  min-width: 140px;
}

/* ── Hero ── */
.hero { text-align: center; padding: var(--space-3xl) 0; }
.hero__badge {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: var(--surface-accent-bg);
  border: 1px solid var(--surface-accent-border);
  font-size: 0.8rem;
  color: var(--text-accent);
  margin-bottom: var(--space-xl);
  font-weight: 500;
}
.hero__title { margin-bottom: var(--space-lg); }
.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.7;
}
.hero__cta {
  display: flex; flex-direction: column;
  align-items: center; gap: var(--space-md);
}

/* ── Features Grid ── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
}
.feature-card {
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-base);
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-lg);
}
.feature-card__icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
  background: var(--surface-accent-bg);
  color: var(--text-accent);
}
.feature-card__title {
  font-family: var(--font-display);
  font-weight: 600; font-size: 1.1rem;
  margin-bottom: var(--space-sm);
}
.feature-card__desc { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

/* ── Steps ── */
.steps { display: flex; gap: var(--space-xl); padding: var(--space-2xl) 0; }
.step { flex: 1; text-align: center; }
.step__number {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: var(--text-inverse);
  font-family: var(--font-display);
  font-weight: 800; font-size: 1.2rem;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto var(--space-md);
  box-shadow: var(--shadow-glow-green);
}
.step__title { font-family: var(--font-display); font-weight: 600; margin-bottom: var(--space-xs); }
.step__desc { font-size: 0.875rem; color: var(--text-secondary); }

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-xl) 0;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 0.85rem;
}
.footer-sites {
  margin-bottom: var(--space-xl);
  text-align: left;
}
.footer-sites__toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-glass);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: all var(--transition-fast);
}
.footer-sites__toggle:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
  border-color: var(--border-medium);
}
.footer-sites__toggle[aria-expanded="true"] .footer-sites__chevron {
  transform: rotate(180deg);
}
.footer-sites__chevron {
  transition: transform var(--transition-fast);
}
.footer-sites__panel {
  margin-top: var(--space-sm);
}
.footer-sites__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-sm);
}
.footer-site-card {
  display: block;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-glass);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-fast);
}
.footer-site-card:hover {
  border-color: var(--border-medium);
  background: var(--bg-glass-hover);
  transform: translateY(-1px);
}
.footer-site-card--current {
  border-color: rgba(0, 200, 83, 0.28);
  box-shadow: var(--shadow-glow-green);
}
.footer-site-card__eyebrow {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: 0.35rem;
}
.footer-site-card__name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}
.footer-site-card__meta {
  font-size: 0.78rem;
  color: var(--text-secondary);
}
.footer-legal {
  font-size: 0.75rem;
}
.footer-legal a {
  color: var(--text-secondary);
  text-decoration: none;
}
.footer-legal a:hover {
  color: var(--text-primary);
  text-decoration: underline;
}
.legal-page {
  max-width: 860px;
  margin: 0 auto;
}
.legal-card {
  text-align: left;
  line-height: 1.8;
}
.legal-card h1,
.legal-card h2 {
  font-family: var(--font-display);
}
.legal-card h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-bottom: var(--space-sm);
}
.legal-card h2 {
  font-size: 1.05rem;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}
.legal-card p {
  color: var(--text-secondary);
}
.legal-meta {
  color: var(--text-tertiary);
  font-size: 0.85rem;
}

/* ── Stats ── */
.stats-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: var(--space-md); }
.stat { text-align: center; padding: var(--space-md); border-radius: var(--radius-md); background: var(--bg-glass); }
.stat__value {
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.5rem;
  color: var(--text-accent);
  line-height: 1; margin-bottom: var(--space-xs);
}
.stat__label { font-size: 0.75rem; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.05em; }

/* ── Empty State ── */
.empty-state { text-align: center; padding: var(--space-3xl) var(--space-xl); color: var(--text-tertiary); }
.empty-state__icon { font-size: 3rem; margin-bottom: var(--space-md); opacity: 0.5; }
.empty-state__text { font-size: 0.95rem; max-width: 300px; margin: 0 auto; }

/* ── QR Code ── */
.qr-wrapper {
  background: white;
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  display: inline-flex;
  margin: var(--space-md) auto;
}
.pix-code-display {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  word-break: break-all;
  color: var(--text-secondary);
}

/* ── Status Badge ── */
.status-badge {
  display: inline-flex; align-items: center; gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.7rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.03em;
}
.status-badge--active { background: rgba(0, 230, 118, 0.15); color: var(--color-success); }

/* ── Ad slots ── */
.ad-slot {
  min-height: 90px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-glass);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
  color: var(--text-tertiary);
  font-size: 0.75rem;
}

/* ── Animations ── */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideInRight { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: translateX(0); } }
@keyframes scaleIn { from { opacity: 0; transform: scale(0.9); } to { opacity: 1; transform: scale(1); } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }

.animate-fade-in { animation: fadeIn var(--transition-slow) forwards; }
.animate-fade-in-up { animation: fadeInUp var(--transition-slow) forwards; }
.animate-scale-in { animation: scaleIn var(--transition-spring) forwards; }
.animate-float { animation: float 3s ease-in-out infinite; }

.stagger-1 { animation-delay: 0.05s; }
.stagger-2 { animation-delay: 0.1s; }
.stagger-3 { animation-delay: 0.15s; }
.stagger-4 { animation-delay: 0.2s; }
.stagger-5 { animation-delay: 0.25s; }
.stagger-6 { animation-delay: 0.3s; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ── Utilities ── */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.hidden { display: none !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); border: 0;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .container { padding: 0 var(--space-md); }
  .card { padding: var(--space-lg); }
  .header__inner { gap: var(--space-sm); }
  .header__logo { font-size: 1.2rem; min-width: 0; }
  .header__logo-icon { width: 32px; height: 32px; }
  .header__nav { gap: var(--space-xs); flex-shrink: 0; }
  .header__nav .btn { padding-left: 0.8rem; padding-right: 0.8rem; }
  .steps { flex-direction: column; gap: var(--space-lg); }
  .step { display: flex; align-items: center; text-align: left; gap: var(--space-md); }
  .step__number { margin: 0; flex-shrink: 0; }
  .features-grid { grid-template-columns: 1fr; }
  .hero { padding: var(--space-2xl) 0; }
  .expense-item__actions { opacity: 1; }
  .expense-item {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: start;
    padding-right: var(--space-md);
  }
  .expense-item__content {
    min-width: 0;
  }
  .expense-item__header {
    align-items: flex-start;
  }
  .expense-item__meta {
    flex-wrap: wrap;
  }
  .expense-item__amount {
    font-size: 1rem;
  }
  .expense-item__actions {
    grid-column: 2;
    justify-content: flex-end;
  }
  .settlement-item {
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-md);
  }
  .settlement-item__arrow {
    flex-wrap: wrap;
  }
  .settlement-item__amount {
    font-size: 1.1rem;
  }
  .settlement-item .btn {
    width: 100%;
  }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .template-grid { grid-template-columns: repeat(3, 1fr); }
  .modal { padding: var(--space-lg); border-radius: var(--radius-lg); }
  .modal-backdrop { padding: var(--space-md); }
  .modal__header {
    gap: var(--space-sm);
  }
  .modal__title {
    min-width: 0;
    font-size: 1.05rem;
  }
  .balance-row {
    grid-template-columns: 72px 1fr;
    grid-template-areas:
      "name amount"
      "bar bar";
    gap: var(--space-xs) var(--space-sm);
  }
  .balance-row__name { grid-area: name; }
  .balance-row__bar-wrapper { grid-area: bar; }
  .balance-row__amount {
    grid-area: amount;
    min-width: 0;
    font-size: 0.82rem;
  }
  .settlement-header {
    grid-template-columns: 1fr;
    align-items: stretch;
    position: static;
  }
  .settlement-header__side {
    display: none;
  }
  .settlement-header__title {
    position: static;
    width: 100%;
    pointer-events: auto;
  }
  .settlement-header > :last-child {
    justify-self: stretch;
    background: transparent;
    padding-left: 0;
  }
  .expense-sort {
    justify-content: flex-end;
    width: 100%;
  }
  .settlement-header .btn {
    width: 100%;
  }
  #group-header > .flex.items-center {
    flex-wrap: wrap;
    align-items: center;
  }
  .toast-container { left: var(--space-md); right: var(--space-md); bottom: var(--space-md); }
  .toast { max-width: 100%; }
  .header__nav .btn--ghost.nav-desktop { display: none; }
}

@media (max-width: 480px) {
  .header__inner {
    align-items: flex-start;
  }
  .header__nav {
    flex-wrap: wrap;
    justify-content: flex-end;
    max-width: 56%;
  }
  .header__nav .btn {
    min-width: 2.25rem;
    padding-left: 0.65rem;
    padding-right: 0.65rem;
  }
  .header__nav .header-utility {
    padding-inline: 0.7rem;
  }
  .header__nav > .btn--primary {
    margin-left: 0;
  }
  .btn--lg { padding: 0.85rem 1.5rem; font-size: 1rem; }
  .template-grid { grid-template-columns: repeat(3, 1fr); }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .expense-item {
    gap: var(--space-sm);
    padding-left: var(--space-md);
  }
  .expense-item__icon {
    width: 36px;
    height: 36px;
  }
  .expense-item__content {
    min-width: 0;
  }
  .expense-item__header {
    flex-direction: column;
    gap: 0.2rem;
    align-items: flex-start;
  }
  .expense-item__amount {
    text-align: left;
  }
  .expense-item__actions {
    grid-column: 1 / -1;
    justify-content: flex-end;
  }
  .group-card {
    flex-wrap: wrap;
    gap: var(--space-md);
  }
  .group-card__amount {
    width: calc(100% - 2.5rem);
    text-align: left;
  }
  .group-card__delete {
    margin-left: auto;
  }
  .footer-sites__grid {
    grid-template-columns: 1fr;
  }
  .modal {
    max-height: 85vh;
    padding: var(--space-md);
  }
  .modal__title {
    font-size: 1rem;
  }
}

/* ── History Page — Group Cards ── */
.history-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.history-toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(220px, 1fr);
  gap: var(--space-lg);
  align-items: end;
}

.history-toolbar__search,
.history-toolbar__sort {
  min-width: 0;
}

.history-toolbar__actions {
  display: flex;
  justify-content: flex-end;
  align-items: end;
}

.history-toolbar__clear {
  white-space: nowrap;
}

.group-card {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}
.group-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.group-card:hover {
  background: var(--bg-glass-hover);
  border-color: var(--surface-accent-border);
  box-shadow: var(--shadow-glow-green);
  transform: translateY(-2px);
}
.group-card:hover::before { opacity: 1; }

.group-card__icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-md);
  background: var(--surface-accent-bg);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  color: var(--text-accent);
  flex-shrink: 0;
}

.group-card__content { flex: 1; min-width: 0; }
.group-card__title {
  font-family: var(--font-display);
  font-weight: 600; font-size: 1rem;
  margin-bottom: 0.25rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.group-card__meta {
  display: flex; align-items: center; gap: var(--space-sm);
  font-size: 0.8rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}
.group-card__meta-divider {
  color: var(--text-tertiary);
  font-size: 0.6rem;
}

.group-card__amount {
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.1rem;
  color: var(--text-accent);
  flex-shrink: 0;
  text-align: right;
}
.group-card__amount-sub {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  font-weight: 400;
}

.group-card__delete {
  width: 2rem; height: 2rem;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-tertiary);
  transition: all var(--transition-fast);
  opacity: 1;
  flex-shrink: 0;
}
.group-card__delete:hover {
  background: rgba(255, 82, 82, 0.15);
  color: var(--color-error);
}

@media (max-width: 768px) {
  .history-toolbar {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .history-toolbar__actions {
    justify-content: stretch;
  }

  .history-toolbar__clear {
    width: 100%;
    justify-content: center;
  }
}

/* ── Balance Chart ── */
.balance-chart {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.balance-row {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
}

.balance-row__name {
  font-weight: 600;
  font-size: 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.balance-row__bar-wrapper {
  display: flex;
  align-items: center;
  height: 28px;
  position: relative;
}

.balance-row__bar {
  height: 100%;
  border-radius: var(--radius-sm);
  transition: width var(--transition-slow);
  position: absolute;
  min-width: 2px;
}

.balance-row__bar--positive {
  left: 50%;
  background: linear-gradient(90deg, rgba(0, 200, 83, 0.6), rgba(0, 200, 83, 0.9));
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.balance-row__bar--negative {
  right: 50%;
  background: linear-gradient(90deg, rgba(255, 82, 82, 0.9), rgba(255, 82, 82, 0.6));
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}
.balance-row__bar--paid {
  left: 0;
  background: linear-gradient(90deg, color-mix(in srgb, var(--color-primary) 65%, white), var(--color-primary));
  border-radius: var(--radius-sm);
}

.balance-row__center-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border-medium);
}

.balance-row__amount {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  min-width: 80px;
  text-align: right;
}
.balance-row__amount--positive { color: var(--color-success); }
.balance-row__amount--negative { color: var(--color-error); }
.balance-row__amount--paid { color: var(--text-accent); }

.currency-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.currency-section + .currency-section {
  margin-top: var(--space-lg);
}

.currency-section__title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.currency-section__title::before {
  content: '';
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 999px;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-primary) 20%, transparent);
}

.currency-section__title-text {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.currency-section__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* ── Settlement Header ── */
.settlement-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 1.4fr) minmax(0, 1fr);
  align-items: center;
  gap: var(--space-sm);
  min-height: 2.5rem;
}
.settlement-header__side {
  min-height: 1px;
}
.settlement-header__title {
  grid-column: 2;
  width: 100%;
  margin: 0;
}
.settlement-header > :last-child {
  grid-column: 3;
  justify-self: end;
}

@media (max-width: 768px) {
  .group-card__delete { opacity: 1; }
  .balance-row { grid-template-columns: 70px 1fr auto; }
  .balance-row__amount { min-width: 60px; }
}