/* ============================================
   YUGM AI - Design System
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700;800&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Brand */
  --color-primary: #091525;
  --color-primary-light: #132847;
  --color-primary-dark: #050c15;
  --color-accent: #2083ff;
  --color-accent-strong: #1665d8;
  --color-accent-soft: #7fb6ff;
  --color-accent-glow: rgba(32, 131, 255, 0.26);
  --color-accent-wash: rgba(32, 131, 255, 0.1);

  /* Surfaces */
  --color-bg-light: #f5f8fc;
  --color-bg-dark: #07101b;
  --color-bg-darker: #040910;
  --color-bg-card: rgba(16, 27, 44, 0.82);
  --color-bg-card-solid: #0f1d30;
  --color-bg-card-hover: #152740;
  --color-bg-surface: rgba(255, 255, 255, 0.04);
  --color-bg-surface-strong: rgba(255, 255, 255, 0.08);

  /* Text */
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #8ea0ba;
  --color-text-white: #f4f8ff;
  --color-text-white-secondary: #b2bfd4;
  --color-text-white-muted: #7f90ab;

  /* Borders */
  --color-border: #d8e1ee;
  --color-border-dark: rgba(142, 160, 186, 0.18);
  --color-border-strong: rgba(142, 160, 186, 0.3);
  --color-border-accent: rgba(32, 131, 255, 0.34);

  /* Status */
  --color-success: #1fb56e;
  --color-success-bg: rgba(31, 181, 110, 0.14);
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.14);
  --color-danger: #ef4444;
  --color-danger-bg: rgba(239, 68, 68, 0.14);
  --color-info: #60a5fa;
  --color-info-bg: rgba(96, 165, 250, 0.14);

  /* Chat */
  --color-chat-user: #4ade80;
  --color-chat-admin: #e7edf7;

  /* Typography */
  --font-display: 'DM Sans', sans-serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Font sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-md: 1.125rem;
  --text-lg: 1.25rem;
  --text-xl: 1.5rem;
  --text-2xl: 1.875rem;
  --text-3xl: 2.25rem;
  --text-4xl: 3rem;
  --text-5xl: 3.75rem;
  --text-6xl: 4.5rem;

  /* Weights */
  --font-regular: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 1.75rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  --radius-full: 999px;

  /* Shadows */
  --shadow-sm: 0 8px 18px rgba(3, 7, 18, 0.12);
  --shadow-md: 0 16px 32px rgba(3, 7, 18, 0.16);
  --shadow-lg: 0 24px 56px rgba(3, 7, 18, 0.28);
  --shadow-xl: 0 36px 80px rgba(3, 7, 18, 0.42);
  --shadow-glow: 0 18px 50px rgba(32, 131, 255, 0.18);
  --shadow-glow-strong: 0 24px 70px rgba(32, 131, 255, 0.22);

  /* Motion */
  --transition-fast: 160ms ease;
  --transition-base: 260ms ease;
  --transition-slow: 360ms ease;
  --transition-spring: 420ms cubic-bezier(0.22, 1, 0.36, 1);

  /* Layout */
  --max-width: 1240px;
  --header-height: 84px;
  --sidebar-width: 280px;

  /* Z-index */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal-backdrop: 300;
  --z-modal: 400;
  --z-toast: 500;
  --z-fab: 600;
  --z-chatbot: 700;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-weight: var(--font-regular);
  line-height: 1.65;
  color: var(--color-text-white);
  background:
    radial-gradient(circle at top left, rgba(32, 131, 255, 0.12), transparent 30%),
    radial-gradient(circle at 85% 10%, rgba(96, 165, 250, 0.08), transparent 28%),
    linear-gradient(180deg, #08111c 0%, #050b13 48%, #03070d 100%);
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(circle at center, rgba(0, 0, 0, 0.8), transparent 88%);
  pointer-events: none;
}

main,
section,
footer {
  position: relative;
}

section {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: var(--font-bold);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

p {
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

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

input,
textarea,
select {
  font: inherit;
  color: inherit;
  outline: none;
  border: none;
}

ul,
ol {
  list-style: none;
}

::selection {
  color: white;
  background: rgba(32, 131, 255, 0.45);
}

:focus-visible {
  outline: 3px solid rgba(127, 182, 255, 0.45);
  outline-offset: 3px;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section-padding {
  padding: var(--space-20) 0;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: var(--space-4);
  left: var(--space-4);
  z-index: 1000;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-full);
  background: white;
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  transform: translateY(-140%);
  box-shadow: var(--shadow-lg);
}

.skip-link:focus {
  transform: translateY(0);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 46px;
  padding: 0.85rem 1.3rem;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  line-height: 1;
  white-space: nowrap;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.btn svg {
  flex-shrink: 0;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  color: white;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-strong) 100%);
  border-color: rgba(127, 182, 255, 0.24);
  box-shadow: 0 14px 30px rgba(32, 131, 255, 0.22);
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  color: var(--color-text-white);
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--color-border-dark);
}

.btn-secondary:hover {
  color: var(--color-text-white);
  background: rgba(255, 255, 255, 0.07);
  border-color: var(--color-border-strong);
}

.btn-outline {
  color: var(--color-accent-soft);
  background: transparent;
  border-color: rgba(127, 182, 255, 0.32);
}

.btn-outline:hover {
  color: white;
  background: rgba(32, 131, 255, 0.14);
  border-color: rgba(127, 182, 255, 0.5);
}

.btn-ghost {
  color: var(--color-text-white-secondary);
  background: transparent;
}

.btn-ghost:hover,
.btn-ghost.active {
  color: var(--color-text-white);
  background: rgba(255, 255, 255, 0.06);
}

.btn-lg {
  min-height: 54px;
  padding: 1rem 1.55rem;
  font-size: var(--text-base);
}

.btn-sm {
  min-height: 38px;
  padding: 0.7rem 1rem;
  font-size: var(--text-xs);
}

.btn-icon {
  width: 42px;
  min-width: 42px;
  height: 42px;
  padding: 0;
  border-radius: var(--radius-full);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: var(--font-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.badge-active {
  color: #8df0b8;
  background: var(--color-success-bg);
}

.badge-upcoming,
.badge-pending {
  color: #ffca61;
  background: var(--color-warning-bg);
}

.badge-rejected {
  color: #ff9e9e;
  background: var(--color-danger-bg);
}

.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: var(--radius-full);
  display: inline-block;
}

.badge-active .badge-dot { background: var(--color-success); }
.badge-upcoming .badge-dot,
.badge-pending .badge-dot { background: var(--color-warning); }
.badge-rejected .badge-dot { background: var(--color-danger); }

/* Cards */
.card,
.card-flat {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-dark);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.card {
  transition: border-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-accent);
  box-shadow: var(--shadow-glow);
}

/* Forms */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-white-secondary);
}

.form-input,
.form-select {
  width: 100%;
  padding: 0.95rem 1rem;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  background: rgba(4, 9, 16, 0.8);
  color: var(--color-text-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.form-input:hover,
.form-select:hover {
  border-color: var(--color-border-strong);
}

.form-input:focus,
.form-select:focus {
  border-color: rgba(127, 182, 255, 0.58);
  box-shadow: 0 0 0 4px rgba(32, 131, 255, 0.15);
  background: rgba(4, 9, 16, 0.96);
}

.form-input::placeholder {
  color: var(--color-text-white-muted);
}

textarea.form-input {
  min-height: 140px;
  resize: vertical;
}

.form-select {
  appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23b2bfd4' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.8rem;
}

/* Section heading */
.section-header {
  margin-bottom: var(--space-12);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  padding: 0.5rem 0.8rem;
  border: 1px solid rgba(127, 182, 255, 0.18);
  border-radius: var(--radius-full);
  color: var(--color-accent-soft);
  background: rgba(32, 131, 255, 0.08);
  font-size: 0.72rem;
  font-weight: var(--font-semibold);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(2rem, 3vw, 3.4rem);
  font-weight: var(--font-extrabold);
  color: var(--color-text-white);
  margin-bottom: var(--space-4);
}

.section-subtitle {
  max-width: 700px;
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  color: var(--color-text-white-secondary);
  line-height: 1.8;
}

.section-subtitle.centered {
  margin-left: auto;
  margin-right: auto;
}

/* Small utilities */
.eyebrow-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--color-text-white-secondary);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
}

.surface-card {
  background: linear-gradient(180deg, rgba(16, 27, 44, 0.92), rgba(9, 18, 31, 0.88));
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.stack-sm > * + * {
  margin-top: var(--space-3);
}

.stack-md > * + * {
  margin-top: var(--space-5);
}

/* Motion helpers */
.fade-in,
.fade-in-left,
.fade-in-right,
.scale-in {
  opacity: 0;
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.fade-in {
  transform: translateY(28px);
}

.fade-in-left {
  transform: translateX(-28px);
}

.fade-in-right {
  transform: translateX(28px);
}

.scale-in {
  transform: scale(0.95);
}

.fade-in.visible,
.fade-in-left.visible,
.fade-in-right.visible,
.scale-in.visible {
  opacity: 1;
  transform: none;
}

/* Grid utilities */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 1024px) {
  .section-padding {
    padding: var(--space-16) 0;
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  html {
    scroll-padding-top: calc(var(--header-height) + 18px);
  }

  .container {
    padding: 0 var(--space-4);
  }

  .section-padding {
    padding: var(--space-12) 0;
  }

  .section-header {
    margin-bottom: var(--space-10);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .btn,
  .btn-lg {
    min-height: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .fade-in,
  .fade-in-left,
  .fade-in-right,
  .scale-in {
    opacity: 1;
    transform: none;
  }
}