/* ============================================================
   RaQvo Design System — Phase 1 Foundation
   ============================================================
   Premium fashion-tech aesthetic: refined, restrained, high-trust.
   All tokens defined here; consumed by app.css and page-level styles.
   ============================================================ */

/* ----------------------------------------------------------
   1. COLOR TOKENS
   ---------------------------------------------------------- */
:root {
  /* --- Primary Accent: Deep Indigo --- */
  --color-accent: #4338CA;
  --color-accent-hover: #3730A3;
  --color-accent-light: #6366F1;
  --color-accent-subtle: rgba(67, 56, 202, 0.08);
  --color-accent-ring: rgba(67, 56, 202, 0.18);

  /* --- Neutrals: Warm ink palette --- */
  --color-ink: #111111;
  --color-ink-secondary: #3D3935;
  --color-ink-muted: #78716C;
  --color-ink-faint: #A8A29E;

  /* --- Surfaces: 3-level hierarchy --- */
  --color-surface-page: #FAF9F7;
  --color-surface-card: #FFFFFF;
  --color-surface-elevated: #F5F3EF;

  /* --- Borders --- */
  --color-border: rgba(0, 0, 0, 0.08);
  --color-border-strong: rgba(0, 0, 0, 0.14);

  /* --- Semantic Colors --- */
  --color-success: #16A34A;
  --color-success-subtle: rgba(22, 163, 74, 0.08);
  --color-warning: #D97706;
  --color-warning-subtle: rgba(217, 119, 6, 0.08);
  --color-error: #DC2626;
  --color-error-subtle: rgba(220, 38, 38, 0.08);
  --color-info: #2563EB;
  --color-info-subtle: rgba(37, 99, 235, 0.08);

  /* --- Overlay --- */
  --color-overlay: rgba(17, 17, 17, 0.5);
  --color-white: #FFFFFF;

  /* ----------------------------------------------------------
     2. TYPOGRAPHY TOKENS
     ---------------------------------------------------------- */

  /* Font Families */
  --font-heading: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-body: 'DM Sans', system-ui, -apple-system, sans-serif;

  /* Font Sizes — Minor Third scale (1.2) */
  --text-xs: 0.694rem;   /* ~11px */
  --text-sm: 0.833rem;   /* ~13px */
  --text-base: 1rem;     /* 16px  */
  --text-md: 1.125rem;   /* 18px  */
  --text-lg: 1.25rem;    /* 20px  */
  --text-xl: 1.5rem;     /* 24px  */
  --text-2xl: 1.875rem;  /* 30px  */
  --text-3xl: 2.25rem;   /* 36px  */
  --text-4xl: 3rem;      /* 48px  */
  --text-5xl: 3.75rem;   /* 60px  */

  /* Font Weights */
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* Line Heights */
  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.65;

  /* Letter Spacing */
  --tracking-tight: -0.03em;
  --tracking-normal: 0;
  --tracking-wide: 0.04em;
  --tracking-wider: 0.08em;

  /* ----------------------------------------------------------
     3. SPACING TOKENS (4px base grid)
     ---------------------------------------------------------- */
  --space-1: 0.25rem;  /* 4px  */
  --space-2: 0.5rem;   /* 8px  */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */

  /* ----------------------------------------------------------
     4. COMPONENT TOKENS
     ---------------------------------------------------------- */

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows — soft, layered */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(0, 0, 0, 0.05);

  /* Transitions */
  --transition-fast: 120ms ease;
  --transition-base: 180ms ease;
  --transition-slow: 280ms ease;

  /* Z-Index Scale */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal-backdrop: 900;
  --z-modal: 1000;
  --z-toast: 1100;

  /* Container widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1200px;
}

/* ============================================================
   5. GLOBAL RESETS & BASE STYLES
   ============================================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--color-ink);
  background-color: var(--color-surface-page);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--color-ink);
}

h1 { font-size: clamp(var(--text-2xl), 5vw, var(--text-5xl)); }
h2 { font-size: clamp(var(--text-xl), 4vw, var(--text-3xl)); }
h3 { font-size: var(--text-lg); }
h4 { font-size: var(--text-md); }

p {
  color: var(--color-ink-muted);
  line-height: var(--leading-relaxed);
}

a {
  color: inherit;
  text-decoration: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

/* Focus visible — accessible, styled */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============================================================
   6. BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  line-height: 1;
  padding: var(--space-3) var(--space-6);
  min-height: 44px;
  border: 1.5px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  -webkit-user-select: none;
  user-select: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px var(--color-accent-ring);
}

.btn-secondary {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-border-strong);
}
.btn-secondary:hover {
  background: var(--color-surface-elevated);
  border-color: var(--color-ink-muted);
}

.btn-ghost {
  background: transparent;
  color: var(--color-ink-muted);
  border-color: transparent;
  padding: var(--space-2) var(--space-3);
}
.btn-ghost:hover {
  background: var(--color-surface-elevated);
  color: var(--color-ink);
}

.btn-accent-outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.btn-accent-outline:hover {
  background: var(--color-accent-subtle);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

.btn-lg {
  font-size: var(--text-base);
  padding: var(--space-4) var(--space-8);
  min-height: 48px;
  border-radius: var(--radius-md);
}

.btn-sm {
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-4);
  min-height: 36px;
}

/* Dark button variant (for dark backgrounds) */
.btn-dark {
  background: var(--color-ink);
  color: var(--color-white);
  border-color: var(--color-ink);
}
.btn-dark:hover {
  background: #222;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ============================================================
   7. FORM INPUTS
   ============================================================ */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-ink);
  letter-spacing: var(--tracking-normal);
}

.form-input,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="url"],
input[type="tel"],
input[type="search"],
textarea,
select {
  font-family: var(--font-body);
  font-size: var(--text-base); /* 16px prevents iOS auto-zoom */
  color: var(--color-ink);
  background: var(--color-white);
  border: 1.5px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  min-height: 44px;
  width: 100%;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-ring);
}

.form-input::placeholder,
input::placeholder,
textarea::placeholder {
  color: var(--color-ink-faint);
}

.form-input[aria-invalid="true"],
.form-input.input-error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px var(--color-error-subtle);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--color-ink-faint);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--color-error);
  font-weight: var(--weight-medium);
}

/* ============================================================
   8. CARDS
   ============================================================ */
.card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card-interactive {
  cursor: pointer;
}
.card-interactive:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.card-elevated {
  border: none;
  box-shadow: var(--shadow-sm);
}
.card-elevated:hover {
  box-shadow: var(--shadow-lg);
}

/* ============================================================
   9. BADGES / CHIPS
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-surface-elevated);
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.badge-accent {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.badge-success {
  background: var(--color-success-subtle);
  color: var(--color-success);
}

.badge-warning {
  background: var(--color-warning-subtle);
  color: var(--color-warning);
}

.badge-error {
  background: var(--color-error-subtle);
  color: var(--color-error);
}

/* ============================================================
   10. NAVIGATION
   ============================================================ */
.ds-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-8);
  background: rgba(250, 249, 247, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.ds-nav .logo {
  font-family: var(--font-heading);
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-tight);
  color: var(--color-ink);
  text-decoration: none;
}

.ds-nav .logo span {
  color: var(--color-accent);
}

.ds-nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.ds-nav-links a {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-ink-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.ds-nav-links a:hover {
  color: var(--color-ink);
  background: var(--color-surface-elevated);
}

.ds-nav-links a.active {
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  font-weight: var(--weight-semibold);
}

/* ============================================================
   11. TOAST / ALERTS
   ============================================================ */
.toast {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  background: var(--color-ink);
  color: var(--color-white);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  z-index: var(--z-toast);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s ease;
  max-width: 400px;
  box-shadow: var(--shadow-xl);
}
.toast.show {
  transform: translateY(0);
  opacity: 1;
}
.toast.error {
  background: var(--color-error);
}
.toast.success {
  background: var(--color-success);
}

.alert {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
}

.alert-error {
  background: var(--color-error-subtle);
  color: var(--color-error);
  border: 1px solid rgba(220, 38, 38, 0.15);
}

.alert-success {
  background: var(--color-success-subtle);
  color: var(--color-success);
  border: 1px solid rgba(22, 163, 74, 0.15);
}

.alert-info {
  background: var(--color-info-subtle);
  color: var(--color-info);
  border: 1px solid rgba(37, 99, 235, 0.15);
}

/* ============================================================
   12. MODAL
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  padding: var(--space-4);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--color-surface-card);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  max-width: 500px;
  width: 100%;
  box-shadow: var(--shadow-xl);
  transform: translateY(20px);
  transition: transform var(--transition-base);
}
.modal-overlay.open .modal {
  transform: translateY(0);
}

/* ============================================================
   13. SPINNER
   ============================================================ */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2.5px solid var(--color-border-strong);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: ds-spin 0.7s linear infinite;
}
.spinner-light {
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: var(--color-white);
}

@keyframes ds-spin {
  to { transform: rotate(360deg); }
}

/* ============================================================
   14. EMPTY STATE
   ============================================================ */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-8);
  color: var(--color-ink-muted);
}
.empty-state .empty-icon {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-4);
}
.empty-state h3 {
  font-size: var(--text-lg);
  color: var(--color-ink);
  margin-bottom: var(--space-2);
}
.empty-state p {
  max-width: 380px;
  margin: 0 auto var(--space-6);
}

/* ============================================================
   15. FOOTER
   ============================================================ */
.ds-footer {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: var(--space-8) var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* ============================================================
   16. UTILITY CLASSES
   ============================================================ */
.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-ink-muted); }
.text-faint { color: var(--color-ink-faint); }
.text-success { color: var(--color-success); }
.text-error { color: var(--color-error); }

.font-heading { font-family: var(--font-heading); }
.font-body { font-family: var(--font-body); }

.fw-regular { font-weight: var(--weight-regular); }
.fw-medium { font-weight: var(--weight-medium); }
.fw-semibold { font-weight: var(--weight-semibold); }
.fw-bold { font-weight: var(--weight-bold); }

.uppercase {
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
}

/* Container */
.container {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding-left: var(--space-8);
  padding-right: var(--space-8);
}

/* Section spacing */
.section {
  padding-top: var(--space-24);
  padding-bottom: var(--space-24);
}

/* ============================================================
   17. RESPONSIVE BREAKPOINTS
   ============================================================ */
@media (max-width: 768px) {
  :root {
    --space-8: 1.5rem;
    --space-16: 3rem;
    --space-24: 4rem;
  }

  .ds-nav {
    padding: var(--space-3) var(--space-5);
  }

  .ds-nav .logo {
    font-size: var(--text-md);
  }

  .ds-nav-links a {
    padding: var(--space-2) var(--space-2);
    font-size: var(--text-xs);
  }

  .ds-footer {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
    padding: var(--space-6) var(--space-5);
  }

  .container {
    padding-left: var(--space-5);
    padding-right: var(--space-5);
  }

  .section {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }

  .btn-lg {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  :root {
    --space-8: 1.25rem;
    --space-16: 2.5rem;
    --space-24: 3rem;
  }

  .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .toast {
    left: var(--space-4);
    right: var(--space-4);
    bottom: var(--space-4);
    max-width: none;
  }
}