/* =============================================
   WeSightRead Design System
   Version 2.0 — Warm & Approachable
   ============================================= */

/* ===== Google Fonts are loaded via <link> in HTML ===== */

/* ===== CSS Custom Properties (Light Mode) ===== */
:root {
  /* --- Brand (Warm Blue) --- */
  --color-brand-50:  #eef3fd;
  --color-brand-100: #dae4fb;
  --color-brand-200: #b8ccf7;
  --color-brand-300: #8fadf2;
  --color-brand-400: #6f90ed;
  --color-brand-500: #4f74e8;
  --color-brand-600: #3a5bd4;
  --color-brand-700: #2d47b0;
  --color-brand-800: #23378a;
  --color-brand-900: #1a2968;

  /* --- Accent (Warm Teal) --- */
  --color-accent-50:  #effcfb;
  --color-accent-100: #d5f5f3;
  --color-accent-200: #aceae6;
  --color-accent-300: #72d8d0;
  --color-accent-400: #38c4b8;
  --color-accent-500: #14b8a6;
  --color-accent-600: #0d9488;
  --color-accent-700: #0f766e;
  --color-accent-800: #115e59;
  --color-accent-900: #134e4a;

  /* --- Success (Green) --- */
  --color-success-50:  #ecfdf5;
  --color-success-100: #d1fae5;
  --color-success-200: #a7f3d0;
  --color-success-300: #6ee7b7;
  --color-success-400: #34d399;
  --color-success-500: #10b981;
  --color-success-600: #059669;
  --color-success-700: #047857;
  --color-success-800: #065f46;
  --color-success-900: #064e3b;

  /* --- Warning (Amber) --- */
  --color-warning-50:  #fffbeb;
  --color-warning-100: #fef3c7;
  --color-warning-200: #fde68a;
  --color-warning-300: #fcd34d;
  --color-warning-400: #fbbf24;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;
  --color-warning-700: #b45309;
  --color-warning-800: #92400e;
  --color-warning-900: #78350f;

  /* --- Error (Red) --- */
  --color-error-50:  #fef2f2;
  --color-error-100: #fee2e2;
  --color-error-200: #fecaca;
  --color-error-300: #fca5a5;
  --color-error-400: #f87171;
  --color-error-500: #ef4444;
  --color-error-600: #dc2626;
  --color-error-700: #b91c1c;
  --color-error-800: #991b1b;
  --color-error-900: #7f1d1d;

  /* --- Neutral (Warm Stone) --- */
  --color-neutral-50:  #fafaf9;
  --color-neutral-100: #f5f5f4;
  --color-neutral-200: #e7e5e4;
  --color-neutral-300: #d6d3d1;
  --color-neutral-400: #a8a29e;
  --color-neutral-500: #78716c;
  --color-neutral-600: #57534e;
  --color-neutral-700: #44403c;
  --color-neutral-800: #292524;
  --color-neutral-900: #1c1917;

  /* --- Semantic Colors --- */
  --color-bg:          var(--color-neutral-50);
  --color-surface:     #ffffff;
  --color-surface-alt: var(--color-neutral-100);
  --color-border:      var(--color-neutral-200);
  --color-border-hover: var(--color-neutral-300);
  --color-text:        var(--color-neutral-900);
  --color-text-secondary: var(--color-neutral-500);
  --color-text-muted:  var(--color-neutral-400);

  /* --- Brand Gradient --- */
  --gradient-brand: linear-gradient(135deg, var(--color-brand-500) 0%, var(--color-brand-700) 100%);
  --gradient-brand-hover: linear-gradient(135deg, var(--color-brand-600) 0%, var(--color-brand-800) 100%);
  --gradient-hero: linear-gradient(135deg, #1a2968 0%, var(--color-brand-500) 50%, var(--color-accent-500) 100%);
  --gradient-success: linear-gradient(135deg, var(--color-success-500) 0%, var(--color-success-700) 100%);
  --gradient-warning: linear-gradient(135deg, var(--color-warning-500) 0%, var(--color-warning-600) 100%);

  /* --- Typography --- */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --text-xs:   0.75rem;   /* 12px */
  --text-sm:   0.875rem;  /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg:   1.125rem;  /* 18px */
  --text-xl:   1.25rem;   /* 20px */
  --text-2xl:  1.5rem;    /* 24px */
  --text-3xl:  1.875rem;  /* 30px */
  --text-4xl:  2.25rem;   /* 36px */

  --leading-tight: 1.2;
  --leading-normal: 1.5;
  --leading-relaxed: 1.7;

  --tracking-tight: -0.01em;
  --tracking-normal: 0;
  --tracking-wide: 0.03em;

  /* --- Spacing --- */
  --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 */

  /* --- Border Radius --- */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  20px;
  --radius-full: 9999px;

  /* --- Shadows --- */
  --shadow-xs:  0 1px 2px rgba(28, 25, 23, 0.05);
  --shadow-sm:  0 2px 4px rgba(28, 25, 23, 0.06);
  --shadow-md:  0 4px 12px rgba(28, 25, 23, 0.08);
  --shadow-lg:  0 8px 24px rgba(28, 25, 23, 0.1);
  --shadow-xl:  0 16px 40px rgba(28, 25, 23, 0.12);
  --shadow-2xl: 0 20px 60px rgba(28, 25, 23, 0.2);
  --shadow-brand: 0 4px 14px rgba(79, 116, 232, 0.25);
  --shadow-brand-lg: 0 8px 24px rgba(79, 116, 232, 0.35);
  --shadow-success: 0 4px 14px rgba(16, 185, 129, 0.25);
  --shadow-glow: 0 0 20px rgba(79, 116, 232, 0.15);

  /* --- Focus Ring --- */
  --focus-ring: 0 0 0 3px rgba(79, 116, 232, 0.4);
  --focus-ring-offset: 0 0 0 2px var(--color-surface), 0 0 0 4px rgba(79, 116, 232, 0.4);

  /* --- Transitions --- */
  --transition-fast:   150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow:   300ms ease;
  --transition-spring: 300ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* --- Z-Index Scale --- */
  --z-base:      1;
  --z-dropdown:  100;
  --z-sticky:    200;
  --z-overlay:   1000;
  --z-modal:     2000;
  --z-fullscreen: 3000;
  --z-toast:     4000;
}


/* ===== Dark Mode Overrides ===== */
[data-theme="dark"] {
  --color-bg:          #1a1816;
  --color-surface:     #262220;
  --color-surface-alt: #302c28;
  --color-border:      #3d3835;
  --color-border-hover: #524c47;
  --color-text:        #e7e5e4;
  --color-text-secondary: #a8a29e;
  --color-text-muted:  #78716c;

  /* Soften brand in dark mode */
  --color-brand-50:  #1e2640;
  --color-brand-100: #253058;

  /* Shadows need more opacity in dark mode */
  --shadow-xs:  0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm:  0 2px 4px rgba(0, 0, 0, 0.25);
  --shadow-md:  0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg:  0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-xl:  0 16px 40px rgba(0, 0, 0, 0.4);
  --shadow-2xl: 0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-brand: 0 4px 14px rgba(79, 116, 232, 0.2);
  --shadow-brand-lg: 0 8px 24px rgba(79, 116, 232, 0.25);
  --shadow-glow: 0 0 20px rgba(79, 116, 232, 0.1);

  --focus-ring: 0 0 0 3px rgba(79, 116, 232, 0.5);

  /* Gradient adjustments */
  --gradient-hero: linear-gradient(135deg, #0f1729 0%, #1e2f5a 50%, #0d4a44 100%);
}

/* Dark mode form element overrides */
[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
  background-color: var(--color-surface-alt);
  color: var(--color-text);
  border-color: var(--color-border);
}

[data-theme="dark"] input::placeholder,
[data-theme="dark"] textarea::placeholder {
  color: var(--color-text-muted);
}

[data-theme="dark"] input:focus,
[data-theme="dark"] select:focus,
[data-theme="dark"] textarea:focus {
  border-color: var(--color-brand-500);
  box-shadow: var(--focus-ring);
}


/* ===== Score Area — Always White ===== */
.score-area,
.score-area *,
[data-theme="dark"] .score-area,
[data-theme="dark"] .score-area * {
  background: #ffffff !important;
  color: #000000 !important;
}

.score-area svg text {
  fill: #000000 !important;
}


/* ===== Base Reset ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background: var(--color-bg);
  margin: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}


/* ===== Typography Utilities ===== */
.font-mono {
  font-family: var(--font-mono);
}

.text-xs   { font-size: var(--text-xs); }
.text-sm   { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg   { font-size: var(--text-lg); }
.text-xl   { font-size: var(--text-xl); }
.text-2xl  { font-size: var(--text-2xl); }
.text-3xl  { font-size: var(--text-3xl); }
.text-4xl  { font-size: var(--text-4xl); }

.font-medium   { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold     { font-weight: 700; }

.text-secondary { color: var(--color-text-secondary); }
.text-muted     { color: var(--color-text-muted); }
.text-brand     { color: var(--color-brand-500); }


/* ===== Interactive Element Defaults ===== */
a {
  color: var(--color-brand-500);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-brand-600);
}

button, .btn {
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-normal);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}


/* ===== Button Components ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: var(--gradient-brand);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-primary:hover {
  background: var(--gradient-brand-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-brand-lg);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  background: var(--color-neutral-400);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: var(--color-surface);
  color: var(--color-text);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-secondary:hover {
  border-color: var(--color-brand-500);
  background: var(--color-brand-50);
  color: var(--color-brand-600);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: transparent;
  color: var(--color-text-secondary);
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-ghost:hover {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: var(--color-surface);
  color: var(--color-text-secondary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-icon:hover {
  border-color: var(--color-brand-500);
  color: var(--color-brand-500);
  background: var(--color-brand-50);
}


/* ===== Card Components ===== */
.card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-elevated {
  background: var(--color-surface);
  border: none;
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
}


/* ===== Chip / Tag Components ===== */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface-alt);
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.chip-brand {
  background: var(--color-brand-50);
  color: var(--color-brand-600);
  border-color: var(--color-brand-200);
}

.chip-accent {
  background: var(--color-accent-50);
  color: var(--color-accent-600);
  border-color: var(--color-accent-200);
}

.chip-success {
  background: var(--color-success-50);
  color: var(--color-success-700);
  border-color: var(--color-success-200);
}


/* ===== Theme Toggle ===== */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: var(--color-surface-alt);
  color: var(--color-text-secondary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.theme-toggle:hover {
  border-color: var(--color-brand-500);
  color: var(--color-brand-500);
  background: var(--color-brand-50);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  width: 20px;
  height: 20px;
}

/* In light mode, show sun and hide moon */
.theme-toggle .icon-moon { display: none; }
.theme-toggle .icon-sun  { display: block; }

/* In dark mode, show moon and hide sun */
[data-theme="dark"] .theme-toggle .icon-sun  { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }


/* ===== Shared Page Patterns ===== */

/* Full-page gradient background (used by pre-lobby, utility pages) */
.page-gradient {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  background: var(--gradient-hero);
}

/* Card on gradient background */
.page-card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  width: 100%;
  max-width: 480px;
  overflow: hidden;
}

.page-card-header {
  padding: var(--space-8) var(--space-8) var(--space-5);
  text-align: center;
}

.page-card-body {
  padding: var(--space-5) var(--space-8) var(--space-8);
}


/* ===== Collapsible Section Component ===== */
.collapsible-section {
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  margin-bottom: var(--space-3);
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.collapsible-section:hover {
  border-color: var(--color-border-hover);
}

.collapsible-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  transition: background var(--transition-fast);
}

.collapsible-header:hover {
  background: var(--color-surface-alt);
}

.collapsible-header .section-icon {
  width: 20px;
  height: 20px;
  color: var(--color-brand-500);
  flex-shrink: 0;
}

.collapsible-header .section-title {
  flex: 1;
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-text);
}

.collapsible-header .section-chevron {
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.collapsible-section.collapsed .section-chevron {
  transform: rotate(-90deg);
}

.collapsible-body {
  padding: 0 var(--space-5) var(--space-5);
  max-height: 2000px;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow), opacity var(--transition-normal);
  opacity: 1;
}

.collapsible-section.collapsed .collapsible-body {
  max-height: 0;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
}


/* ===== Preset Chips ===== */
.preset-bar {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  padding: var(--space-4);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-3);
}

.preset-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface-alt);
  color: var(--color-text);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.preset-chip:hover {
  border-color: var(--color-brand-400);
  background: var(--color-brand-50);
  color: var(--color-brand-600);
  transform: translateY(-1px);
}

.preset-chip.active {
  background: var(--color-brand-500);
  color: #ffffff;
  border-color: var(--color-brand-500);
}

.preset-chip i,
.preset-icon {
  width: 16px;
  height: 16px;
}


/* ===== Page Load Animation ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.4s ease-out both;
}

.animate-in-delay-1 { animation-delay: 0.1s; }
.animate-in-delay-2 { animation-delay: 0.2s; }
.animate-in-delay-3 { animation-delay: 0.3s; }


/* ===== Responsive Breakpoints ===== */
/* Mobile: < 640px */
/* Tablet: 640px - 1023px */
/* Desktop: >= 1024px */

@media (max-width: 639px) {
  :root {
    --text-3xl: 1.5rem;
    --text-4xl: 1.875rem;
  }
}


/* ===== Print Styles ===== */
@media print {
  .theme-toggle,
  .preset-bar,
  .collapsible-header .section-chevron,
  .fullscreen-enter-btn,
  nav,
  footer {
    display: none !important;
  }

  body {
    background: white !important;
    color: black !important;
  }

  .score-area {
    box-shadow: none !important;
    border: none !important;
  }
}