/*
Theme Name: RiVER
Theme URI: https://river.dev
Author: RiVER
Author URI: https://river.dev
Description: RiVER公式サイト用オリジナルテーマ。軽量・モバイルファースト設計。
Version: 3.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: river
*/

/* ==========================================================================
   RiVER Design System v3.0 — "Liquid Clarity"

   Concept: 流れる水のような透明感と動き
   - Deep navy base with electric blue accents
   - Glass-morphism cards with subtle depth
   - Smooth, orchestrated animations
   - Japanese typography optimized
   ========================================================================== */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Zen+Kaku+Gothic+New:wght@400;500;700;900&family=Outfit:wght@300;400;500;600;700&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors - Deep Navy Base */
  --c-navy-950: #020617;
  --c-navy-900: #0a1628;
  --c-navy-800: #1e293b;
  --c-navy-700: #334155;
  --c-navy-600: #475569;
  --c-navy-500: #64748b;

  /* Colors - Electric Blue Accent */
  --c-blue-400: #60a5fa;
  --c-blue-500: #3b82f6;
  --c-blue-600: #2563eb;
  --c-blue-glow: rgba(59, 130, 246, 0.5);

  /* Colors - Cyan Highlight */
  --c-cyan-300: #67e8f9;
  --c-cyan-400: #22d3ee;

  /* Colors - Neutral */
  --c-white: #ffffff;
  --c-gray-50: #f8fafc;
  --c-gray-100: #f1f5f9;
  --c-gray-200: #e2e8f0;
  --c-gray-300: #cbd5e1;
  --c-gray-400: #94a3b8;

  /* Semantic */
  --c-text: var(--c-navy-800);
  --c-text-muted: var(--c-navy-600);
  --c-text-subtle: var(--c-navy-500);
  --c-bg: var(--c-white);
  --c-bg-subtle: #f0f7ff;

  /* Discord */
  --c-discord: #5865F2;
  --c-discord-hover: #4752c4;

  /* Status */
  --c-status-released: #10b981;
  --c-status-testflight: #3b82f6;
  --c-status-dev: #f59e0b;
  --c-status-planned: #8b5cf6;
  --c-status-ended: #6b7280;

  /* Typography */
  --ff-display: 'Outfit', 'Zen Kaku Gothic New', sans-serif;
  --ff-body: 'Zen Kaku Gothic New', -apple-system, BlinkMacSystemFont, sans-serif;

  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.25rem;
  --fs-2xl: 1.5rem;
  --fs-3xl: 2rem;
  --fs-4xl: 2.5rem;
  --fs-5xl: 3.5rem;
  --fs-6xl: 4.5rem;

  /* Spacing */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.25rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-20: 5rem;
  --sp-24: 6rem;
  --sp-32: 8rem;

  /* Border Radius */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-2xl: 32px;
  --r-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(10, 22, 40, 0.04);
  --shadow-md: 0 4px 20px rgba(10, 22, 40, 0.08);
  --shadow-lg: 0 12px 40px rgba(10, 22, 40, 0.12);
  --shadow-xl: 0 24px 60px rgba(10, 22, 40, 0.16);
  --shadow-glow: 0 0 40px var(--c-blue-glow);

  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-blur: blur(20px);

  /* Transitions */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

  /* Layout */
  --max-w: 1000px;
  --max-w-narrow: 680px;
}


/* ==========================================================================
   Animations - Keyframes
   ========================================================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-20px) rotate(2deg);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 0 20px var(--c-blue-glow);
  }
  50% {
    box-shadow: 0 0 40px var(--c-blue-glow), 0 0 60px rgba(59, 130, 246, 0.3);
  }
}

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

@keyframes ripple {
  0% {
    transform: scale(0);
    opacity: 0.5;
  }
  100% {
    transform: scale(4);
    opacity: 0;
  }
}

@keyframes slide-in-right {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes blob {
  0%, 100% {
    border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
  }
  50% {
    border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%;
  }
}


/* ==========================================================================
   Reset & Base
   ========================================================================== */

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

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

body {
  font-family: var(--ff-body);
  font-size: var(--fs-base);
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--c-text);
  background-color: var(--c-bg);
  overflow-x: hidden;
}

/* Subtle noise texture overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  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");
  opacity: 0.015;
  pointer-events: none;
  z-index: 9999;
}

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

::selection {
  background: var(--c-blue-500);
  color: var(--c-white);
}


/* ==========================================================================
   Links
   ========================================================================== */

a {
  color: var(--c-blue-500);
  text-decoration: none;
  transition: color 0.3s var(--ease-out-expo);
  position: relative;
}

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

a:focus-visible {
  outline: 2px solid var(--c-blue-400);
  outline-offset: 4px;
  border-radius: var(--r-sm);
}


/* ==========================================================================
   Layout
   ========================================================================== */

.site {
  position: relative;
}

.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--sp-6);
}

.section {
  position: relative;
  padding-block: var(--sp-24);
  overflow: hidden;
}

.section--alt {
  background: linear-gradient(180deg, var(--c-bg-subtle) 0%, var(--c-white) 100%);
}

/* Section title with animated underline */
.section__title {
  font-family: var(--ff-display);
  font-size: var(--fs-2xl);
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--c-navy-900);
  text-align: center;
  margin-block-end: var(--sp-16);
  position: relative;
  animation: fadeInUp 0.8s var(--ease-out-expo) both;
}

.section__title::after {
  content: "";
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--c-blue-400), var(--c-cyan-400));
  border-radius: var(--r-full);
  animation: shimmer 2s ease-in-out infinite;
  background-size: 200% 100%;
}


/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-4) var(--sp-8);
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  border: none;
  border-radius: var(--r-xl);
  cursor: pointer;
  text-decoration: none;
  overflow: hidden;
  transition: all 0.4s var(--ease-out-expo);
  -webkit-tap-highlight-color: transparent;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(255,255,255,0.3) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.btn:hover::before {
  opacity: 1;
}

.btn:focus-visible {
  outline: 2px solid var(--c-blue-400);
  outline-offset: 4px;
}

.btn:active {
  transform: scale(0.98);
}

/* Primary Button */
.btn--primary {
  background: linear-gradient(135deg, var(--c-navy-800) 0%, var(--c-navy-900) 100%);
  color: var(--c-white);
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255,255,255,0.1);
}

.btn--primary:hover {
  color: var(--c-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255,255,255,0.1);
}

/* Discord Button */
.btn--discord {
  background: linear-gradient(135deg, var(--c-discord) 0%, #4752c4 100%);
  color: var(--c-white);
  box-shadow: var(--shadow-md), 0 4px 20px rgba(88, 101, 242, 0.3);
}

.btn--discord:hover {
  color: var(--c-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 8px 30px rgba(88, 101, 242, 0.4);
}

/* Outline Button */
.btn--outline {
  background: transparent;
  border: 2px solid var(--c-gray-200);
  color: var(--c-text);
  backdrop-filter: var(--glass-blur);
}

.btn--outline:hover {
  border-color: var(--c-blue-500);
  color: var(--c-blue-500);
  background: rgba(59, 130, 246, 0.05);
}

/* Small Button */
.btn--small {
  padding: var(--sp-3) var(--sp-5);
  font-size: var(--fs-xs);
  border-radius: var(--r-lg);
}


/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-block: var(--sp-32);
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59, 130, 246, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(34, 211, 238, 0.08), transparent),
    radial-gradient(ellipse 50% 30% at 20% 80%, rgba(139, 92, 246, 0.06), transparent),
    var(--c-white);
  overflow: hidden;
}

/* Animated background orbs */
.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  animation: float 20s ease-in-out infinite;
  pointer-events: none;
}

.hero::before {
  width: 600px;
  height: 600px;
  background: linear-gradient(135deg, var(--c-blue-400), var(--c-cyan-300));
  top: -200px;
  right: -200px;
  animation-delay: 0s;
}

.hero::after {
  width: 400px;
  height: 400px;
  background: linear-gradient(135deg, var(--c-cyan-400), var(--c-blue-500));
  bottom: -100px;
  left: -100px;
  animation-delay: -10s;
}

.hero--has-bg {
  background-image: var(--hero-bg-image);
  background-size: cover;
  background-position: center;
}

.hero--has-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 22, 40, calc(var(--hero-overlay-opacity, 0.5) * 0.9)) 0%,
    rgba(10, 22, 40, var(--hero-overlay-opacity, 0.5)) 100%
  );
  z-index: 1;
}

.hero--has-bg .container {
  position: relative;
  z-index: 2;
}

.hero--has-bg .hero__title,
.hero--has-bg .hero__tagline,
.hero--has-bg .hero__description {
  color: var(--c-white);
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.hero .container {
  position: relative;
  z-index: 2;
}

.hero__title {
  font-family: var(--ff-display);
  font-size: var(--fs-6xl);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-navy-900);
  margin-block-end: var(--sp-4);
  background: linear-gradient(135deg, var(--c-navy-900) 0%, var(--c-navy-700) 50%, var(--c-blue-600) 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation:
    fadeInUp 1s var(--ease-out-expo) both,
    gradient-shift 8s ease-in-out infinite;
}

.hero__tagline {
  font-family: var(--ff-display);
  font-size: var(--fs-xl);
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.1em;
  color: var(--c-text-muted);
  margin-block-end: var(--sp-6);
  animation: fadeInUp 1s var(--ease-out-expo) 0.1s both;
}

.hero__description {
  font-size: var(--fs-lg);
  line-height: 1.9;
  color: var(--c-text-muted);
  max-width: 540px;
  margin-inline: auto;
  margin-block-end: var(--sp-10);
  animation: fadeInUp 1s var(--ease-out-expo) 0.2s both;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
  justify-content: center;
  animation: fadeInUp 1s var(--ease-out-expo) 0.3s both;
}


/* ==========================================================================
   Works Section
   ========================================================================== */

.works__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-8);
}

@media (min-width: 640px) {
  .works__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Glass-morphism Card */
.work-card {
  position: relative;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transition: all 0.5s var(--ease-out-expo);
  animation: fadeInScale 0.8s var(--ease-out-expo) both;
}

.work-card:nth-child(1) { animation-delay: 0.1s; }
.work-card:nth-child(2) { animation-delay: 0.2s; }
.work-card:nth-child(3) { animation-delay: 0.3s; }
.work-card:nth-child(4) { animation-delay: 0.4s; }

/* Gradient border effect on hover */
.work-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--r-2xl);
  padding: 2px;
  background: linear-gradient(135deg, var(--c-blue-400), var(--c-cyan-400), var(--c-blue-500));
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

.work-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.work-card:hover::before {
  opacity: 1;
}

.work-card__image {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: linear-gradient(135deg, var(--c-gray-100), var(--c-bg-subtle));
}

.work-card__image::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(10, 22, 40, 0.1) 100%);
  pointer-events: none;
}

.work-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease-out-expo);
}

.work-card:hover .work-card__image img {
  transform: scale(1.08);
}

.work-card__no-image {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  background:
    radial-gradient(ellipse at 30% 20%, rgba(59, 130, 246, 0.1), transparent 50%),
    radial-gradient(ellipse at 70% 80%, rgba(34, 211, 238, 0.08), transparent 50%),
    linear-gradient(135deg, var(--c-gray-100), var(--c-bg-subtle));
  color: var(--c-text-subtle);
}

.work-card__no-image svg {
  opacity: 0.3;
  animation: float 6s ease-in-out infinite;
}

.work-card__no-image span {
  font-size: var(--fs-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.4;
}

.work-card__header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-3);
  padding: var(--sp-6) var(--sp-6) 0;
  margin-block-end: var(--sp-3);
}

.work-card__title {
  font-family: var(--ff-display);
  font-size: var(--fs-lg);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-navy-900);
  margin: 0;
  transition: color 0.3s ease;
}

.work-card:hover .work-card__title {
  color: var(--c-blue-600);
}

.work-card__status {
  display: inline-flex;
  align-items: center;
  padding: var(--sp-1) var(--sp-3);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  border-radius: var(--r-full);
  background: var(--c-gray-100);
  color: var(--c-text-subtle);
  white-space: nowrap;
  transition: all 0.3s ease;
}

.work-card__status--released {
  background: linear-gradient(135deg, #d1fae5, #a7f3d0);
  color: #047857;
}

.work-card__status--testflight {
  background: linear-gradient(135deg, #dbeafe, #bfdbfe);
  color: #1d4ed8;
  animation: pulse-glow 3s ease-in-out infinite;
}

.work-card__status--running {
  background: linear-gradient(135deg, #d1fae5, #6ee7b7);
  color: #065f46;
  animation: pulse-glow 3s ease-in-out infinite;
}

.work-card__status--dev {
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  color: #b45309;
}

.work-card__status--planned {
  background: linear-gradient(135deg, #ede9fe, #ddd6fe);
  color: #6d28d9;
}

.work-card__status--ended {
  background: var(--c-gray-200);
  color: var(--c-gray-500);
}

.work-card__description,
.work-card__note,
.work-card__actions {
  padding-inline: var(--sp-6);
}

.work-card__description {
  font-size: var(--fs-sm);
  line-height: 1.9;
  color: var(--c-text-muted);
  margin-block-end: var(--sp-4);
}

.work-card__note {
  position: relative;
  font-size: var(--fs-xs);
  line-height: 1.8;
  color: var(--c-text-muted);
  background: linear-gradient(135deg, var(--c-bg-subtle), rgba(59, 130, 246, 0.05));
  padding: var(--sp-4);
  border-radius: var(--r-lg);
  margin: 0 var(--sp-6) var(--sp-5);
  border-left: 3px solid var(--c-blue-400);
}

.work-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  padding-block-end: var(--sp-6);
}


/* ==========================================================================
   About Section
   ========================================================================== */

.about__text {
  max-width: var(--max-w-narrow);
  margin-inline: auto;
  text-align: center;
  animation: fadeInUp 0.8s var(--ease-out-expo) 0.2s both;
}

.about__text p {
  font-size: var(--fs-lg);
  line-height: 2;
  color: var(--c-text-muted);
  margin-block-end: var(--sp-6);
}

.about__text p:last-child {
  margin-block-end: 0;
}


/* ==========================================================================
   Representative Section
   ========================================================================== */

.representative {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  animation: fadeInUp 0.8s var(--ease-out-expo) 0.1s both;
}

.representative__icon {
  position: relative;
  width: 120px;
  height: 120px;
  border-radius: var(--r-full);
  object-fit: cover;
  margin-block-end: var(--sp-6);
  background: linear-gradient(135deg, var(--c-gray-200), var(--c-bg-subtle));
  box-shadow: var(--shadow-lg);
  border: 4px solid var(--c-white);
  transition: all 0.5s var(--ease-out-expo);
  animation: blob 10s ease-in-out infinite;
}

.representative__icon:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.representative__name {
  font-family: var(--ff-display);
  font-size: var(--fs-xl);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-navy-900);
  margin-block-end: var(--sp-3);
}

.representative__bio {
  font-size: var(--fs-base);
  line-height: 1.9;
  color: var(--c-text-muted);
  max-width: 450px;
  margin-block-end: var(--sp-8);
}

.representative__links {
  display: flex;
  gap: var(--sp-4);
}

.representative__link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--r-full);
  background: var(--c-white);
  color: var(--c-text-muted);
  box-shadow: var(--shadow-md);
  transition: all 0.4s var(--ease-out-expo);
  overflow: hidden;
}

.representative__link::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--c-blue-500), var(--c-cyan-400));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.representative__link svg {
  position: relative;
  z-index: 1;
  transition: transform 0.3s var(--ease-out-back);
}

.representative__link:hover {
  color: var(--c-white);
  transform: translateY(-4px) scale(1.1);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.representative__link:hover::before {
  opacity: 1;
}

.representative__link:hover svg {
  transform: scale(1.1);
}

.representative__link:focus-visible {
  outline: 2px solid var(--c-blue-400);
  outline-offset: 4px;
}


/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact {
  text-align: center;
  animation: fadeInUp 0.8s var(--ease-out-expo) 0.2s both;
}

.contact__description {
  font-size: var(--fs-lg);
  line-height: 2;
  color: var(--c-text-muted);
  max-width: 500px;
  margin-inline: auto;
  margin-block-end: var(--sp-10);
}

.contact__cta .btn {
  font-size: var(--fs-base);
  padding: var(--sp-5) var(--sp-10);
  animation: pulse-glow 3s ease-in-out infinite;
}

.contact__cta .btn:hover {
  animation: none;
}


/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  position: relative;
  padding-block: var(--sp-12);
  text-align: center;
  background: linear-gradient(180deg, var(--c-white) 0%, var(--c-bg-subtle) 100%);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-blue-400), transparent);
}

.site-footer__text {
  font-size: var(--fs-sm);
  letter-spacing: 0.05em;
  color: var(--c-text-subtle);
  margin: 0;
}

.site-footer__text a {
  color: var(--c-text-muted);
  transition: color 0.3s ease;
  position: relative;
}

.site-footer__text a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--c-blue-400);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s var(--ease-out-expo);
}

.site-footer__text a:hover {
  color: var(--c-blue-500);
}

.site-footer__text a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.site-footer__separator {
  margin-inline: var(--sp-3);
  color: var(--c-gray-300);
}


/* ==========================================================================
   Utilities
   ========================================================================== */

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


/* ==========================================================================
   Page Content (Privacy Policy, etc.)
   ========================================================================== */

.page-content {
  padding-block: var(--sp-24);
  animation: fadeInUp 0.8s var(--ease-out-expo) both;
}

.page-content__header {
  margin-block-end: var(--sp-12);
  padding-block-end: var(--sp-8);
  border-bottom: 2px solid var(--c-gray-100);
}

.page-content__title {
  font-family: var(--ff-display);
  font-size: var(--fs-4xl);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-navy-900);
  margin: 0;
}

.page-content__body {
  max-width: 720px;
}

.page-content__body h2 {
  font-family: var(--ff-display);
  font-size: var(--fs-xl);
  font-weight: 600;
  line-height: 1.4;
  color: var(--c-navy-900);
  margin-block: var(--sp-16) var(--sp-6);
  padding-block-end: var(--sp-3);
  border-bottom: 2px solid var(--c-blue-400);
}

.page-content__body h3 {
  font-size: var(--fs-lg);
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-text);
  margin-block: var(--sp-10) var(--sp-4);
}

.page-content__body p {
  font-size: var(--fs-base);
  line-height: 2;
  color: var(--c-text);
  margin-block-end: var(--sp-5);
}

.page-content__body ul,
.page-content__body ol {
  margin-block-end: var(--sp-5);
  padding-inline-start: var(--sp-6);
}

.page-content__body li {
  margin-block-end: var(--sp-2);
  line-height: 2;
}

.page-content__body a {
  color: var(--c-blue-500);
  text-decoration: underline;
  text-decoration-color: var(--c-blue-300);
  text-underline-offset: 4px;
  transition: all 0.3s ease;
}

.page-content__body a:hover {
  color: var(--c-blue-600);
  text-decoration-color: var(--c-blue-500);
}

.page-content__meta {
  margin-block-start: var(--sp-16);
  padding-block-start: var(--sp-8);
  border-top: 1px solid var(--c-gray-200);
  font-size: var(--fs-sm);
  color: var(--c-text-subtle);
}


/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 768px) {
  :root {
    --fs-6xl: 2.5rem;
    --fs-5xl: 2rem;
    --fs-4xl: 1.75rem;
    --fs-3xl: 1.5rem;
    --fs-2xl: 1.25rem;
  }

  .container {
    padding-inline: var(--sp-5);
  }

  .hero {
    min-height: auto;
    padding-block: var(--sp-20) var(--sp-16);
  }

  .hero::before,
  .hero::after {
    opacity: 0.3;
    filter: blur(60px);
  }

  .hero__cta {
    flex-direction: column;
    align-items: stretch;
    gap: var(--sp-3);
    max-width: 280px;
    margin-inline: auto;
  }

  .section {
    padding-block: var(--sp-16);
  }

  .section__title {
    margin-block-end: var(--sp-10);
  }

  .works__grid {
    gap: var(--sp-6);
  }

  .work-card__header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-2);
  }

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

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