/* ========================================
   Toshi's Midnight Laboratory - Main Stylesheet
   深夜の研究室をイメージしたデザイン
   ======================================== */

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

/* --- CSS Custom Properties (Dark Theme - Default) --- */
:root {
  /* Midnight Laboratory Colors */
  --color-bg: #050810;
  --color-bg-secondary: #0a0f1a;
  --color-text: #c8d6e5;
  --color-text-secondary: #7f8c9b;
  --color-accent: #00e5ff;
  --color-accent-hover: #40efff;
  --color-accent-glow: rgba(0, 229, 255, 0.3);
  --color-accent-secondary: #7c4dff;
  --color-border: #141c2a;
  --color-card-bg: #0a1018;
  --color-card-shadow: rgba(0, 229, 255, 0.05);
  --color-card-hover-shadow: rgba(0, 229, 255, 0.12);
  --color-hero-bg: linear-gradient(160deg, #030508 0%, #0a1020 40%, #0c0a22 70%, #050810 100%);
  --color-hero-text: #e0e8f0;
  --color-footer-bg: #030508;
  --color-footer-text: #3a4558;
  --color-code-bg: #080e18;
  --color-badge-bg: rgba(0, 229, 255, 0.1);
  --color-badge-text: #00e5ff;

  /* Typography */
  --font-family: "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  --font-size-base: 16px;
  --line-height: 1.7;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 5rem;

  /* Layout */
  --max-width: 1100px;
  --border-radius: 10px;
  --border-radius-sm: 6px;

  /* Transitions */
  --transition: 0.3s ease;
}

/* --- Morning Theme (夜明け) --- */
[data-theme="morning"] {
  --color-bg: #a89888;
  --color-bg-secondary: #9a8a7a;
  --color-text: #1a1008;
  --color-text-secondary: #4a3828;
  --color-accent: #d2691e;
  --color-accent-hover: #e07828;
  --color-accent-glow: rgba(210, 105, 30, 0.25);
  --color-accent-secondary: #c44d2a;
  --color-border: #8a7a6a;
  --color-card-bg: #b8a898;
  --color-card-shadow: rgba(210, 105, 30, 0.06);
  --color-card-hover-shadow: rgba(210, 105, 30, 0.15);
  --color-hero-bg: linear-gradient(160deg, #1a1008 0%, #2e1a0a 40%, #281510 70%, #1a1008 100%);
  --color-hero-text: #f0e8e0;
  --color-footer-bg: #2c1810;
  --color-footer-text: #a08878;
  --color-code-bg: #9a8a7a;
  --color-badge-bg: rgba(210, 105, 30, 0.15);
  --color-badge-text: #d2691e;
}

/* --- Afternoon Theme (明るい昼) --- */
[data-theme="afternoon"] {
  --color-bg: #f0f2f8;
  --color-bg-secondary: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #555;
  --color-accent: #0077b6;
  --color-accent-hover: #005f8f;
  --color-accent-glow: rgba(0, 119, 182, 0.15);
  --color-accent-secondary: #6a3de8;
  --color-border: #d0d7e2;
  --color-card-bg: #ffffff;
  --color-card-shadow: rgba(0, 0, 0, 0.06);
  --color-card-hover-shadow: rgba(0, 119, 182, 0.12);
  --color-hero-bg: linear-gradient(160deg, #0d1b2a 0%, #1b2d45 40%, #1f1845 70%, #0d1b2a 100%);
  --color-hero-text: #e0e8f0;
  --color-footer-bg: #1a1a2e;
  --color-footer-text: #aaa;
  --color-code-bg: #e8ecf2;
  --color-badge-bg: rgba(0, 119, 182, 0.1);
  --color-badge-text: #0077b6;
}

/* --- Evening Theme (夕暮れ) --- */
[data-theme="evening"] {
  --color-bg: #2a1c28;
  --color-bg-secondary: #302030;
  --color-text: #dcd0c4;
  --color-text-secondary: #9a8878;
  --color-accent: #ff8c42;
  --color-accent-hover: #ffaa66;
  --color-accent-glow: rgba(255, 140, 66, 0.3);
  --color-accent-secondary: #e06030;
  --color-border: #3d2d3a;
  --color-card-bg: #302030;
  --color-card-shadow: rgba(255, 140, 66, 0.05);
  --color-card-hover-shadow: rgba(255, 140, 66, 0.12);
  --color-hero-bg: linear-gradient(160deg, #18101a 0%, #2a1c28 40%, #251520 70%, #18101a 100%);
  --color-hero-text: #e8dcd0;
  --color-footer-bg: #18101a;
  --color-footer-text: #6a5a50;
  --color-code-bg: #241828;
  --color-badge-bg: rgba(255, 140, 66, 0.12);
  --color-badge-text: #ff8c42;
}

/* --- Base Styles --- */
html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition), color var(--transition);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent-hover);
}

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

ul {
  list-style: none;
}

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

/* --- Header --- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition), border-color var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

:root .header {
  background-color: rgba(15, 21, 37, 0.85);
}

[data-theme="morning"] .header {
  background-color: rgba(154, 138, 122, 0.9);
}

[data-theme="afternoon"] .header {
  background-color: rgba(255, 255, 255, 0.9);
}

[data-theme="evening"] .header {
  background-color: rgba(48, 32, 48, 0.85);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

/* Logo - Midnight Laboratory Style */
.logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo .logo-midnight {
  color: var(--color-accent);
  font-weight: 400;
  font-size: 0.85em;
  opacity: 0.9;
}

.logo .logo-lab {
  color: var(--color-accent-secondary);
}

:root .logo,
[data-theme="evening"] .logo {
  text-shadow: 0 0 20px var(--color-accent-glow);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition), text-shadow var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-accent);
}

:root .nav-links a:hover,
:root .nav-links a.active,
[data-theme="evening"] .nav-links a:hover,
[data-theme="evening"] .nav-links a.active {
  text-shadow: 0 0 8px var(--color-accent-glow);
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--color-text);
  transition: border-color var(--transition), color var(--transition),
    box-shadow var(--transition);
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  box-shadow: 0 0 12px var(--color-accent-glow);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  flex-direction: column;
  gap: 5px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero Section --- */
.hero {
  background: url("../images/kochi_night.png") center 20% / cover no-repeat;
  color: var(--color-hero-text);
  padding: var(--spacing-2xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  min-height: 480px;
  display: flex;
  align-items: center;
}

/* Hero backgrounds per theme */
[data-theme="morning"] .hero {
  background-image: url("../images/kochi_morning.png");
}
[data-theme="afternoon"] .hero {
  background-image: url("../images/kochi_afternoon.png");
}
[data-theme="evening"] .hero {
  background-image: url("../images/kochi_evening.png");
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    linear-gradient(180deg, rgba(7, 11, 20, 0.3) 0%, rgba(7, 11, 20, 0.55) 50%, rgba(10, 14, 26, 0.9) 100%),
    radial-gradient(ellipse 600px 300px at 50% 30%, rgba(0, 229, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

[data-theme="morning"] .hero::before {
  background:
    linear-gradient(180deg, rgba(40, 25, 10, 0.2) 0%, rgba(40, 25, 10, 0.45) 50%, rgba(168, 152, 136, 0.95) 100%),
    radial-gradient(ellipse 600px 300px at 50% 30%, rgba(210, 105, 30, 0.08) 0%, transparent 70%);
}

[data-theme="afternoon"] .hero::before {
  background:
    linear-gradient(180deg, rgba(13, 27, 42, 0.3) 0%, rgba(13, 27, 42, 0.55) 50%, rgba(240, 242, 248, 0.95) 100%),
    radial-gradient(ellipse 600px 300px at 50% 30%, rgba(0, 119, 182, 0.08) 0%, transparent 70%);
}

[data-theme="evening"] .hero::before {
  background:
    linear-gradient(180deg, rgba(16, 8, 14, 0.3) 0%, rgba(16, 8, 14, 0.55) 50%, rgba(26, 16, 24, 0.9) 100%),
    radial-gradient(ellipse 600px 300px at 50% 30%, rgba(255, 140, 66, 0.1) 0%, transparent 70%);
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.02em;
  line-height: 1.2;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.6);
}

[data-theme="morning"] .hero-title,
[data-theme="afternoon"] .hero-title {
  color: #ffffff;
  text-shadow:
    1px 1px 2px rgba(0, 0, 0, 0.6),
    -1px -1px 2px rgba(0, 0, 0, 0.6),
    1px -1px 2px rgba(0, 0, 0, 0.6),
    -1px 1px 2px rgba(0, 0, 0, 0.6);
}

.hero-title .title-midnight {
  display: block;
  font-size: 0.45em;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent);
  opacity: 0.8;
  margin-bottom: 0.5rem;
}

.hero-title .title-main {
  background: linear-gradient(135deg, #ffffff 0%, var(--color-accent) 50%, var(--color-accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

[data-theme="morning"] .hero-title .title-main,
[data-theme="afternoon"] .hero-title .title-main {
  text-shadow: none;
  filter: drop-shadow(0 0 2px rgba(0, 0, 0, 0.3));
}

[data-theme="morning"] .hero-title .title-main {
  background: linear-gradient(135deg, #ffffff 0%, #e8a060 50%, #d2691e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

[data-theme="afternoon"] .hero-title .title-main {
  background: linear-gradient(135deg, #ffffff 0%, #50aadd 50%, #6a3de8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

[data-theme="evening"] .hero-title .title-main {
  background: linear-gradient(135deg, #ffe0c0 0%, #ff8c42 50%, #e06030 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  opacity: 0.85;
  max-width: 560px;
  margin: var(--spacing-md) auto var(--spacing-lg);
  line-height: 1.8;
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.7);
}

[data-theme="morning"] .hero-subtitle,
[data-theme="afternoon"] .hero-subtitle {
  color: #ffffff;
  opacity: 1;
  text-shadow:
    1px 1px 2px rgba(0, 0, 0, 0.6),
    -1px -1px 2px rgba(0, 0, 0, 0.6),
    1px -1px 2px rgba(0, 0, 0, 0.6),
    -1px 1px 2px rgba(0, 0, 0, 0.6);
}

.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  border-radius: var(--border-radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition), transform var(--transition),
    box-shadow var(--transition);
  border: none;
  text-align: center;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background-color: var(--color-accent);
  color: #0a0e1a;
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: #0a0e1a;
  box-shadow: 0 4px 20px var(--color-accent-glow);
}

.btn-accent {
  background-color: var(--color-accent);
  color: #0a0e1a;
}

.btn-accent:hover {
  background-color: var(--color-accent-hover);
  color: #0a0e1a;
  box-shadow: 0 4px 16px var(--color-accent-glow);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn-outline:hover {
  background-color: var(--color-accent);
  color: #0a0e1a;
  box-shadow: 0 4px 16px var(--color-accent-glow);
}

/* --- Section --- */
.section {
  padding: var(--spacing-2xl) 0;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--color-text);
}

/* --- App Cards Grid --- */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.app-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  transition: transform var(--transition), box-shadow var(--transition),
    background-color var(--transition), border-color var(--transition);
}

.app-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px var(--color-card-hover-shadow);
  border-color: rgba(0, 229, 255, 0.2);
}

[data-theme="morning"] .app-card:hover {
  border-color: rgba(210, 105, 30, 0.3);
}

[data-theme="afternoon"] .app-card:hover {
  border-color: rgba(0, 119, 182, 0.3);
}

[data-theme="evening"] .app-card:hover {
  border-color: rgba(255, 140, 66, 0.2);
}

.app-card-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #0f1a2e, #1a1040);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: var(--spacing-md);
}

[data-theme="morning"] .app-card-icon {
  background: linear-gradient(135deg, #9a8878, #8a7868);
}

[data-theme="afternoon"] .app-card-icon {
  background: linear-gradient(135deg, #e8ecf2, #dde0f0);
}

[data-theme="evening"] .app-card-icon {
  background: linear-gradient(135deg, #2d1820, #1f1028);
}

.app-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.app-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.app-card-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  background-color: var(--color-badge-bg);
  color: var(--color-badge-text);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.app-card-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.app-card-actions .btn {
  padding: 0.5rem 1.2rem;
  font-size: 0.9rem;
}

/* --- About Section --- */
.about {
  background-color: var(--color-bg-secondary);
  transition: background-color var(--transition);
  position: relative;
}

.about::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse 400px 200px at 70% 50%, rgba(124, 77, 255, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

.about .container {
  position: relative;
  z-index: 1;
}

.about-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.about-content p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.about-content p + p {
  margin-top: var(--spacing-md);
}

/* --- App Detail Page --- */
.app-detail-header {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.app-detail-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #0f1a2e, #1a1040);
  border: 1px solid var(--color-border);
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: #fff;
  flex-shrink: 0;
}

[data-theme="morning"] .app-detail-icon {
  background: linear-gradient(135deg, #9a8878, #8a7868);
}

[data-theme="afternoon"] .app-detail-icon {
  background: linear-gradient(135deg, #e8ecf2, #dde0f0);
}

[data-theme="evening"] .app-detail-icon {
  background: linear-gradient(135deg, #2d1820, #1f1028);
}

.app-detail-info h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.app-detail-info p {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
}

.app-detail-info .app-card-meta {
  margin-top: var(--spacing-sm);
}

.screenshot-area {
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  text-align: center;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: background-color var(--transition), border-color var(--transition);
  overflow: hidden;
}

.screenshot-area img {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius-sm);
}

/* --- Video Section --- */
.app-video-section {
  margin-bottom: var(--spacing-xl);
}

.app-video-section h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.video-container {
  position: relative;
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background-color: var(--color-code-bg);
}

.video-container video {
  width: 100%;
  display: block;
}

.video-placeholder {
  padding: var(--spacing-xl);
  text-align: center;
  color: var(--color-text-secondary);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* How-to Dropdown */
.howto-details {
  margin-top: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  transition: border-color var(--transition);
}

.howto-details[open] {
  border-color: var(--color-accent);
}

.howto-details summary {
  padding: 0.8rem var(--spacing-md);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-accent);
  background-color: var(--color-card-bg);
  transition: background-color var(--transition), color var(--transition);
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.howto-details summary::-webkit-details-marker {
  display: none;
}

.howto-details summary::before {
  content: "\25B6";
  font-size: 0.7em;
  transition: transform var(--transition);
}

.howto-details[open] summary::before {
  transform: rotate(90deg);
}

.howto-details summary:hover {
  background-color: var(--color-code-bg);
}

.howto-content {
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  line-height: 1.9;
}

.howto-content ol {
  padding-left: var(--spacing-lg);
  list-style: decimal;
}

.howto-content ul {
  padding-left: var(--spacing-lg);
  list-style: disc;
}

.howto-content li {
  margin-bottom: var(--spacing-sm);
  font-size: 0.95rem;
}

.howto-content p {
  margin-bottom: var(--spacing-sm);
  font-size: 0.95rem;
}

.howto-content p:last-child {
  margin-bottom: 0;
}

.howto-content strong {
  color: var(--color-text);
}

.howto-content code {
  background-color: var(--color-code-bg);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  font-size: 0.9em;
}

.howto-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-sm) 0;
  font-size: 0.9rem;
}

.howto-content th,
.howto-content td {
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--color-border);
  text-align: left;
}

.howto-content th {
  background-color: var(--color-code-bg);
  color: var(--color-text);
  font-weight: 600;
}

.details-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.details-group .howto-details {
  margin-top: 0;
}

.app-description {
  margin-bottom: var(--spacing-xl);
}

.app-description h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.app-description p {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.download-section {
  margin-bottom: var(--spacing-xl);
}

.download-section h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.download-buttons {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.version-history {
  margin-bottom: var(--spacing-xl);
}

.version-history h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.version-list {
  border-left: 2px solid var(--color-accent);
  padding-left: var(--spacing-lg);
}

:root .version-list,
[data-theme="evening"] .version-list {
  box-shadow: -2px 0 8px var(--color-accent-glow);
}

.version-item {
  margin-bottom: var(--spacing-lg);
}

.version-item h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.version-item .version-date {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.version-item ul {
  list-style: disc;
  padding-left: var(--spacing-lg);
}

.version-item li {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

/* --- Footer --- */
.footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  text-align: center;
  padding: var(--spacing-lg) 0;
  margin-top: auto;
  font-size: 0.85rem;
  transition: background-color var(--transition);
  border-top: 1px solid var(--color-border);
}

/* --- Lab Entry (light themes only) --- */
.lab-entry {
  display: none;
}
[data-theme="morning"] .lab-entry,
[data-theme="afternoon"] .lab-entry {
  display: inline;
  color: inherit;
  opacity: 0.3;
  font-size: 0.75em;
  text-decoration: none;
  margin-left: 0.3em;
  transition: opacity 0.3s ease;
}
[data-theme="morning"] .lab-entry:hover,
[data-theme="afternoon"] .lab-entry:hover {
  opacity: 0.6;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--spacing-md) var(--spacing-lg);
    gap: var(--spacing-md);
  }

  :root .nav-links {
    background-color: rgba(15, 21, 37, 0.95);
  }

  [data-theme="morning"] .nav-links {
    background-color: rgba(154, 138, 122, 0.95);
  }

  [data-theme="afternoon"] .nav-links {
    background-color: rgba(255, 255, 255, 0.95);
  }

  [data-theme="evening"] .nav-links {
    background-color: rgba(48, 32, 48, 0.95);
  }

  .nav-links.open {
    display: flex;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .app-grid {
    grid-template-columns: 1fr;
  }

  .app-detail-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .app-detail-info .app-card-meta {
    justify-content: center;
  }

  .download-buttons {
    flex-direction: column;
  }

  .download-buttons .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero {
    padding: var(--spacing-xl) 0;
    min-height: 360px;
  }

  .hero-title {
    font-size: 1.6rem;
  }

  .hero-title .title-midnight {
    font-size: 0.5em;
    letter-spacing: 0.2em;
  }

  .section {
    padding: var(--spacing-xl) 0;
  }

  .logo {
    font-size: 1rem;
  }
}