/* Kisucha Studio - Landing Page Styles */
/* charset: UTF-8 / mobile-first / dark theme */

/* ===== CSS VARIABLES ===== */
:root {
  --color-bg: #0f0f13;
  --color-bg-2: #13131a;
  --color-surface: #1a1a24;
  --color-surface-2: #20202e;
  --color-border: #2a2a3a;
  --color-border-hover: #3a3a54;
  --color-text: #e8e8f0;
  --color-text-muted: #8888a8;
  --color-text-faint: #55556a;
  --color-accent: #7c6ff7;
  --color-accent-2: #4fa8e8;
  --color-accent-glow: rgba(124, 111, 247, 0.15);
  --color-android: #3ddc84;
  --color-ios: #a0a0b8;
  --color-windows: #0078d4;
  --color-coming-soon: #f0a050;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-3xl: 96px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --font: 'Inter', system-ui, -apple-system, sans-serif;

  --transition: 0.2s ease;
  --transition-slow: 0.35s ease;

  --max-width: 1200px;
  --header-height: 64px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
}

body {
  font-family: var(--font);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

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

img, svg {
  display: block;
  max-width: 100%;
}

button {
  font-family: var(--font);
  cursor: pointer;
  border: none;
  background: none;
}

/* ===== LAYOUT HELPERS ===== */
.section-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

@media (min-width: 768px) {
  .section-inner {
    padding: 0 var(--space-xl);
  }
}

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(15, 15, 19, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

@media (min-width: 768px) {
  .header-inner {
    padding: 0 var(--space-xl);
  }
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--color-text);
  transition: opacity var(--transition);
  flex-shrink: 0;
}

.logo:hover {
  opacity: 0.85;
}

.logo-icon {
  font-size: 1.4rem;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-nav {
  display: none;
  gap: var(--space-lg);
  margin-left: auto;
}

@media (min-width: 768px) {
  .header-nav {
    display: flex;
  }
}

.nav-link {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
  font-weight: 500;
}

.nav-link:hover {
  color: var(--color-text);
}

.lang-toggle {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-surface);
  transition: border-color var(--transition), background var(--transition);
  letter-spacing: 0.05em;
}

@media (min-width: 768px) {
  .lang-toggle {
    margin-left: 0;
  }
}

.lang-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
}

.lang-sep {
  opacity: 0.4;
}

.lang-option.active {
  color: var(--color-accent);
}

/* ===== HERO ===== */
.hero-section {
  position: relative;
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl) var(--space-md);
  overflow: hidden;
  text-align: center;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  max-width: 720px;
}

.hero-glow {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 20%, rgba(124, 111, 247, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 80% 70%, rgba(79, 168, 232, 0.08) 0%, transparent 60%);
  pointer-events: none;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.04em;
}

.hero-title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--color-text) 40%, var(--color-text-muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--color-text-muted);
  max-width: 560px;
  line-height: 1.7;
}

.hero-platforms {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

.platform-chip {
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid;
}

.platform-chip.android {
  color: var(--color-android);
  border-color: rgba(61, 220, 132, 0.3);
  background: rgba(61, 220, 132, 0.06);
}

.platform-chip.ios {
  color: var(--color-ios);
  border-color: rgba(160, 160, 184, 0.3);
  background: rgba(160, 160, 184, 0.06);
}

.platform-chip.windows {
  color: var(--color-windows);
  border-color: rgba(0, 120, 212, 0.3);
  background: rgba(0, 120, 212, 0.06);
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 12px 28px;
  background: var(--color-accent);
  color: white;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--transition), transform var(--transition);
  margin-top: var(--space-sm);
}

.hero-cta:hover {
  background: #9080ff;
  transform: translateY(-2px);
}

/* ===== APPS SECTION ===== */
.apps-section {
  padding: var(--space-3xl) 0;
  background: var(--color-bg-2);
  flex: 1;
}

.section-header {
  margin-bottom: var(--space-xl);
  text-align: center;
}

.section-title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.section-subtitle {
  color: var(--color-text-muted);
  font-size: 1rem;
}

/* ===== APP GRID ===== */
.app-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 600px) {
  .app-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .app-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== APP CARD ===== */
.app-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: transform var(--transition-slow), border-color var(--transition-slow), box-shadow var(--transition-slow);
}

.app-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), 0 0 0 1px var(--color-accent-glow);
}

.app-card.coming-soon {
  border-style: dashed;
  opacity: 0.8;
}

.app-card.coming-soon:hover {
  opacity: 1;
}

.app-icon-wrap {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.app-icon-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.app-name {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.app-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
}

.app-platforms {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.app-platform-tag {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  border: 1px solid;
}

.app-platform-tag.android {
  color: var(--color-android);
  border-color: rgba(61, 220, 132, 0.25);
  background: rgba(61, 220, 132, 0.05);
}

.app-platform-tag.ios {
  color: var(--color-ios);
  border-color: rgba(160, 160, 184, 0.25);
  background: rgba(160, 160, 184, 0.05);
}

.app-platform-tag.windows {
  color: var(--color-windows);
  border-color: rgba(0, 120, 212, 0.25);
  background: rgba(0, 120, 212, 0.05);
}

/* ===== STORE LINKS ===== */
.store-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: auto;
}

.store-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text);
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

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

.store-btn.play-store:hover {
  background: rgba(61, 220, 132, 0.1);
  border-color: rgba(61, 220, 132, 0.4);
  color: var(--color-android);
}

.store-btn.app-store:hover {
  background: rgba(160, 160, 184, 0.1);
  border-color: rgba(160, 160, 184, 0.4);
  color: var(--color-ios);
}

.store-btn.ms-store:hover {
  background: rgba(0, 120, 212, 0.1);
  border-color: rgba(0, 120, 212, 0.4);
  color: var(--color-windows);
}

.store-btn-icon {
  display: inline-block;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* ===== COMING SOON BADGE ===== */
.coming-soon-badge {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 12px 16px;
  background: rgba(240, 160, 80, 0.06);
  border: 1px dashed rgba(240, 160, 80, 0.3);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-coming-soon);
}

.coming-soon-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-coming-soon);
  animation: pulse 2s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

/* ===== ABOUT SECTION ===== */
.about-section {
  padding: var(--space-3xl) 0;
  background: var(--color-bg);
}

.about-inner {
  text-align: center;
  max-width: 640px;
}

.about-logo {
  font-size: 3rem;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-md);
  display: inline-block;
}

.about-title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.about-text {
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: var(--space-xl);
}

.contact-link {
  display: inline-flex;
  align-items: center;
  padding: 10px 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-surface);
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.contact-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-glow);
}

/* ===== FOOTER ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0;
  background: var(--color-bg);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  text-align: center;
}

@media (min-width: 768px) {
  .footer-inner {
    padding: 0 var(--space-xl);
  }
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--color-text-faint);
}

/* ===== EMPTY STATE ===== */
.apps-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-3xl) var(--space-md);
  color: var(--color-text-muted);
}

.apps-empty-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  opacity: 0.4;
}

/* ===== CATEGORY FILTERS ===== */
.category-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.category-filter-btn {
  padding: 6px 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.category-filter-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.category-filter-btn.active {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* ===== LOADING STATE ===== */
.apps-loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-3xl) var(--space-md);
  color: var(--color-text-muted);
}

/* ===== SMOOTH SCROLL OFFSET ===== */
[id] {
  scroll-margin-top: calc(var(--header-height) + 16px);
}