/* ═══════════════════════════════════════════════════════════════════
   TPS — Thailand Political Simulation
   Root Main Menu Stylesheet
   ───────────────────────────────────────────────────────────────────
   Palette: Deep Navy (#0a0e1a), Thai Gold (#d4af37), Ice White     
   Typography: Cinzel (display), Inter (body), Noto Sans Thai        
   ═══════════════════════════════════════════════════════════════════ */

/* ─── CSS Custom Properties ──────────────────────────────────────── */
:root {
  /* Core Navy Palette */
  --navy-900: #060a16;
  --navy-850: #0a0e1a;
  --navy-800: #0f1528;
  --navy-700: #141c36;
  --navy-600: #1a2544;
  --navy-500: #1f2e52;
  --navy-400: #2a3d6b;
  --navy-300: #3a5289;
  --navy-200: #5b7ab5;
  --navy-100: #8ba3d0;

  /* Thai Gold Palette */
  --gold-100: #fef9e7;
  --gold-200: #f5e6a3;
  --gold-300: #f5d778;
  --gold-400: #e8c84a;
  --gold-500: #d4af37;
  --gold-600: #b8941f;
  --gold-700: #96760f;
  --gold-800: #6d5508;

  /* Text */
  --text-primary: #e8eaf0;
  --text-secondary: #9ba3b8;
  --text-muted: #6b748a;
  --text-gold: var(--gold-500);

  /* Typography */
  --font-display: 'Cinzel', 'Georgia', serif;
  --font-body: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-thai: 'Noto Sans Thai', var(--font-body);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 100px;

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--navy-850);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1.6;
}

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

::selection {
  background: rgba(212, 175, 55, 0.3);
  color: var(--gold-100);
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--navy-900); }
::-webkit-scrollbar-thumb { background: var(--navy-500); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--navy-400); }

/* ═══════════════════════════════════════════════════════════════════
   ANIMATED BACKGROUND
   ═══════════════════════════════════════════════════════════════════ */
.bg-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.bg-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% 20%, rgba(26, 37, 68, 0.9) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 15% 85%, rgba(212, 175, 55, 0.05) 0%, transparent 60%),
    radial-gradient(ellipse 40% 40% at 85% 85%, rgba(212, 175, 55, 0.04) 0%, transparent 60%),
    radial-gradient(ellipse 50% 30% at 50% 100%, rgba(26, 37, 68, 0.8) 0%, transparent 70%),
    linear-gradient(180deg, var(--navy-900) 0%, var(--navy-850) 30%, var(--navy-800) 60%, var(--navy-900) 100%);
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(212, 175, 55, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 175, 55, 0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  animation: gridDrift 40s linear infinite;
}

@keyframes gridDrift {
  0% { transform: translate(0, 0); }
  100% { transform: translate(60px, 60px); }
}

.bg-noise {
  position: absolute;
  inset: 0;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

.bg-vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 35%, rgba(6, 10, 22, 0.85) 100%);
}

/* ─── Ambient Light Orbs ─────────────────────────────────────────── */
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0;
  animation: orbFloat 12s ease-in-out infinite;
}

.orb-1 {
  width: 300px;
  height: 300px;
  background: rgba(212, 175, 55, 0.06);
  top: 10%;
  left: 20%;
  animation-delay: 0s;
}

.orb-2 {
  width: 250px;
  height: 250px;
  background: rgba(91, 122, 181, 0.05);
  bottom: 15%;
  right: 15%;
  animation-delay: -4s;
}

.orb-3 {
  width: 200px;
  height: 200px;
  background: rgba(212, 175, 55, 0.04);
  top: 50%;
  right: 30%;
  animation-delay: -8s;
}

@keyframes orbFloat {
  0%, 100% {
    opacity: 0.3;
    transform: translate(0, 0) scale(1);
  }
  25% {
    opacity: 0.6;
    transform: translate(30px, -20px) scale(1.1);
  }
  50% {
    opacity: 0.4;
    transform: translate(-20px, 15px) scale(0.95);
  }
  75% {
    opacity: 0.7;
    transform: translate(15px, 25px) scale(1.05);
  }
}

/* ─── Floating Gold Particles ────────────────────────────────────── */
.particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.particle {
  position: absolute;
  background: var(--gold-500);
  border-radius: 50%;
  pointer-events: none;
}

@keyframes floatUp {
  0% {
    transform: translateY(0) translateX(0) scale(1);
    opacity: 0;
  }
  5% {
    opacity: var(--particle-opacity, 0.15);
  }
  50% {
    opacity: var(--particle-opacity, 0.15);
  }
  95% {
    opacity: 0;
  }
  100% {
    transform: translateY(-110vh) translateX(var(--drift, 0px)) scale(0.4);
    opacity: 0;
  }
}

/* ═══════════════════════════════════════════════════════════════════
   MENU CONTAINER
   ═══════════════════════════════════════════════════════════════════ */
.menu-container {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  max-width: 660px;
  width: 100%;
  padding: var(--space-2xl) var(--space-lg);
  min-height: 100vh;
}

/* ─── Top Accent Bar ─────────────────────────────────────────────── */
.top-accent {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  width: 100%;
  justify-content: center;
}

.accent-line {
  height: 1px;
  flex: 1;
  max-width: 120px;
  background: linear-gradient(90deg, transparent, var(--gold-500), transparent);
  opacity: 0.4;
}

.accent-diamond {
  color: var(--gold-500);
  font-size: 0.55rem;
  opacity: 0.6;
  animation: diamondPulse 3s ease-in-out infinite;
}

@keyframes diamondPulse {
  0%, 100% { opacity: 0.35; transform: scale(1) rotate(0deg); }
  50% { opacity: 1; transform: scale(1.4) rotate(45deg); }
}

/* ═══════════════════════════════════════════════════════════════════
   EMBLEM / CREST
   ═══════════════════════════════════════════════════════════════════ */
.emblem-wrapper {
  position: relative;
  margin-bottom: var(--space-xl);
}

.emblem-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.1) 0%, transparent 65%);
  border-radius: 50%;
  animation: glowPulse 5s ease-in-out infinite;
}

.emblem-ring-outer {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 160px;
  height: 160px;
  border: 1px solid rgba(212, 175, 55, 0.1);
  border-radius: 50%;
  animation: ringRotate 30s linear infinite;
}

@keyframes ringRotate {
  0% { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes glowPulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
  50% { transform: translate(-50%, -50%) scale(1.25); opacity: 1; }
}

.emblem {
  position: relative;
  width: 130px;
  height: 130px;
  transition: transform 0.15s ease-out;
}

.emblem-svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 0 24px rgba(212, 175, 55, 0.2));
}

.emblem-star {
  animation: starRotate 80s linear infinite;
  transform-origin: 70px 70px;
}

@keyframes starRotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ═══════════════════════════════════════════════════════════════════
   GAME TITLE
   ═══════════════════════════════════════════════════════════════════ */
.game-title {
  text-align: center;
  margin-bottom: var(--space-md);
  line-height: 1.1;
}

.title-thai {
  display: block;
  font-family: var(--font-thai);
  font-size: clamp(0.7rem, 1.5vw, 0.85rem);
  color: var(--gold-600);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  opacity: 0.6;
  font-weight: 500;
}

.title-line {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
}

.title-main {
  font-size: clamp(2rem, 6vw, 3rem);
  letter-spacing: 0.12em;
  background: linear-gradient(
    135deg,
    var(--gold-300) 0%,
    var(--gold-500) 25%,
    var(--gold-300) 50%,
    var(--gold-600) 75%,
    var(--gold-400) 100%
  );
  background-size: 300% 300%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: titleShimmer 8s ease-in-out infinite;
  text-shadow: none;
}

.title-sub {
  font-size: clamp(1rem, 3vw, 1.55rem);
  color: var(--text-primary);
  letter-spacing: 0.2em;
  margin-top: 0.2em;
  opacity: 0.88;
}

@keyframes titleShimmer {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ─── Subtitle ───────────────────────────────────────────────────── */
.game-subtitle {
  text-align: center;
  font-size: clamp(0.85rem, 2vw, 1rem);
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1.7;
  max-width: 440px;
  margin-bottom: var(--space-lg);
}

/* ─── Divider ────────────────────────────────────────────────────── */
.divider {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
  opacity: 0.45;
}

.divider-wing {
  color: var(--gold-600);
  font-size: 0.45rem;
  letter-spacing: 0.3em;
  opacity: 0.5;
}

.divider-icon {
  color: var(--gold-500);
  font-size: 0.5rem;
}

/* ═══════════════════════════════════════════════════════════════════
   MENU BUTTONS
   ═══════════════════════════════════════════════════════════════════ */
.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  width: 100%;
  margin-bottom: var(--space-2xl);
}

.menu-btn {
  position: relative;
  display: block;
  padding: var(--space-lg) var(--space-xl);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: all 0.4s var(--ease-out);
  border: 1px solid transparent;
}

/* Shine sweep effect */
.menu-btn .btn-shine {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255,255,255,0.06),
    transparent
  );
  transition: left 0.7s var(--ease-out);
  z-index: 1;
}

.menu-btn:hover .btn-shine {
  left: 100%;
}

/* Button content layout */
.menu-btn .btn-content {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.menu-btn .btn-icon-wrap {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: all 0.35s var(--ease-out);
}

.menu-btn .btn-svg-icon {
  width: 26px;
  height: 26px;
  transition: transform 0.3s var(--ease-spring);
}

.menu-btn:hover .btn-svg-icon {
  transform: scale(1.1);
}

.menu-btn .btn-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.menu-btn .btn-label {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  transition: color 0.3s ease;
}

.menu-btn .btn-desc {
  font-size: 0.78rem;
  opacity: 0.6;
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.5;
  transition: opacity 0.3s ease;
}

.menu-btn:hover .btn-desc {
  opacity: 0.85;
}

.menu-btn .btn-arrow {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  opacity: 0.3;
  transition: all 0.35s var(--ease-out);
}

.menu-btn .btn-arrow svg {
  width: 100%;
  height: 100%;
}

.menu-btn:hover .btn-arrow {
  opacity: 1;
  transform: translateX(6px);
}

/* ── PRIMARY Campaign Button ─────────────────────────────────────── */
.menu-btn-primary {
  background: linear-gradient(
    135deg,
    rgba(212, 175, 55, 0.1) 0%,
    rgba(212, 175, 55, 0.03) 100%
  );
  border-color: rgba(212, 175, 55, 0.2);
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(212, 175, 55, 0.08);
}

/* Primary glow accent */
.menu-btn-primary .btn-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    circle at 50% 80%,
    rgba(212, 175, 55, 0.06) 0%,
    transparent 50%
  );
  pointer-events: none;
  z-index: 0;
  transition: opacity 0.5s ease;
  opacity: 0.5;
}

.menu-btn-primary:hover .btn-glow {
  opacity: 1;
}

.menu-btn-primary:hover {
  background: linear-gradient(
    135deg,
    rgba(212, 175, 55, 0.18) 0%,
    rgba(212, 175, 55, 0.06) 100%
  );
  border-color: rgba(212, 175, 55, 0.4);
  box-shadow:
    0 8px 48px rgba(212, 175, 55, 0.12),
    0 4px 24px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(212, 175, 55, 0.12);
  transform: translateY(-3px);
}

.menu-btn-primary:active {
  transform: translateY(0);
  box-shadow:
    0 2px 12px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(212, 175, 55, 0.08);
}

.menu-btn-primary .btn-icon-wrap {
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.18), rgba(212, 175, 55, 0.06));
  border: 1px solid rgba(212, 175, 55, 0.18);
}

.menu-btn-primary .btn-svg-icon { color: var(--gold-400); }
.menu-btn-primary .btn-label { color: var(--gold-300); }
.menu-btn-primary .btn-desc { color: var(--gold-200); }
.menu-btn-primary .btn-arrow { color: var(--gold-400); }

.menu-btn-primary:hover .btn-icon-wrap {
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.28), rgba(212, 175, 55, 0.1));
  box-shadow: 0 0 24px rgba(212, 175, 55, 0.15);
  border-color: rgba(212, 175, 55, 0.3);
}

/* ── SECONDARY Quick Start Button ────────────────────────────────── */
.menu-btn-secondary {
  background: linear-gradient(
    135deg,
    rgba(91, 122, 181, 0.08) 0%,
    rgba(91, 122, 181, 0.02) 100%
  );
  border-color: rgba(91, 122, 181, 0.15);
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(91, 122, 181, 0.06);
}

.menu-btn-secondary:hover {
  background: linear-gradient(
    135deg,
    rgba(91, 122, 181, 0.16) 0%,
    rgba(91, 122, 181, 0.05) 100%
  );
  border-color: rgba(91, 122, 181, 0.35);
  box-shadow:
    0 8px 48px rgba(91, 122, 181, 0.08),
    0 4px 24px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(91, 122, 181, 0.1);
  transform: translateY(-3px);
}

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

.menu-btn-secondary .btn-icon-wrap {
  background: linear-gradient(135deg, rgba(91, 122, 181, 0.12), rgba(91, 122, 181, 0.04));
  border: 1px solid rgba(91, 122, 181, 0.15);
}

.menu-btn-secondary .btn-svg-icon { color: var(--navy-200); }
.menu-btn-secondary .btn-label { color: var(--text-primary); }
.menu-btn-secondary .btn-desc { color: var(--text-secondary); }
.menu-btn-secondary .btn-arrow { color: var(--navy-200); }

.menu-btn-secondary:hover .btn-icon-wrap {
  background: linear-gradient(135deg, rgba(91, 122, 181, 0.22), rgba(91, 122, 181, 0.06));
  box-shadow: 0 0 20px rgba(91, 122, 181, 0.1);
  border-color: rgba(91, 122, 181, 0.25);
}

/* ═══════════════════════════════════════════════════════════════════
   INFO STRIP
   ═══════════════════════════════════════════════════════════════════ */
.info-strip {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
  padding: 0.6rem var(--space-lg);
  background: rgba(212, 175, 55, 0.03);
  border: 1px solid rgba(212, 175, 55, 0.07);
  border-radius: var(--radius-pill);
  backdrop-filter: blur(8px);
}

.info-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.info-icon {
  font-size: 0.8rem;
}

.info-text {
  font-size: 0.72rem;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  font-weight: 500;
  white-space: nowrap;
}

.info-sep {
  width: 1px;
  height: 14px;
  background: rgba(212, 175, 55, 0.15);
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════════════════════ */
.menu-footer {
  text-align: center;
}

.footer-text {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.footer-version {
  font-size: 0.62rem;
  color: var(--navy-400);
  letter-spacing: 0.06em;
}

/* ═══════════════════════════════════════════════════════════════════
   RESPONSIVE DESIGN
   ═══════════════════════════════════════════════════════════════════ */
@media (max-width: 640px) {
  .menu-container {
    padding: var(--space-xl) var(--space-md);
  }

  .emblem {
    width: 100px;
    height: 100px;
  }

  .emblem-glow {
    width: 180px;
    height: 180px;
  }

  .menu-btn {
    padding: var(--space-md) var(--space-lg);
  }

  .menu-btn .btn-icon-wrap {
    width: 42px;
    height: 42px;
  }

  .menu-btn .btn-svg-icon {
    width: 22px;
    height: 22px;
  }

  .menu-btn .btn-label {
    font-size: 0.95rem;
  }

  .info-strip {
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
    border-radius: var(--radius-lg);
  }

  .info-sep:nth-of-type(3) {
    display: none;
  }
}

@media (max-width: 400px) {
  .menu-btn .btn-content {
    gap: var(--space-md);
  }

  .menu-btn .btn-arrow {
    display: none;
  }

  .title-sub {
    letter-spacing: 0.1em;
  }

  .info-sep {
    display: none;
  }

  .info-strip {
    gap: var(--space-xs);
  }

  .title-thai {
    display: none;
  }
}

/* ═══════════════════════════════════════════════════════════════════
   ANIMATIONS
   ═══════════════════════════════════════════════════════════════════ */

/* Prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}