/* ========== DESIGN TOKENS ========== */
:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* 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-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fonts */
  --font-display: 'Clash Display', 'Inter', sans-serif;
  --font-body: 'General Sans', 'Inter', sans-serif;
}

/* ========== LIGHT MODE ========== */
:root, [data-theme="light"] {
  --color-bg:             #f5f3ff;
  --color-surface:        #ffffff;
  --color-surface-2:      #faf8ff;
  --color-surface-offset: #ede9fe;
  --color-surface-dynamic: #ddd6fe;
  --color-divider:        #d4d0e8;
  --color-border:         #c4bfdb;

  --color-text:           #1e1b2e;
  --color-text-muted:     #6b6785;
  --color-text-faint:     #a8a4be;
  --color-text-inverse:   #f5f3ff;

  --color-primary:        #7c3aed;
  --color-primary-hover:  #6d28d9;
  --color-primary-active: #5b21b6;
  --color-primary-light:  #ede9fe;

  --color-accent:         #f97316;
  --color-accent-hover:   #ea580c;
  --color-accent-light:   #fff7ed;

  --color-teal:           #0d9488;
  --color-teal-light:     #ccfbf1;

  --color-success:        #16a34a;
  --color-warning:        #eab308;

  --shadow-sm: 0 1px 2px rgba(30, 27, 46, 0.06);
  --shadow-md: 0 4px 12px rgba(30, 27, 46, 0.08);
  --shadow-lg: 0 12px 32px rgba(30, 27, 46, 0.12);
  --shadow-glow: 0 0 40px rgba(124, 58, 237, 0.15);
}

/* ========== DARK MODE ========== */
[data-theme="dark"] {
  --color-bg:             #0f0d1a;
  --color-surface:        #1a1726;
  --color-surface-2:      #211d30;
  --color-surface-offset: #161322;
  --color-surface-dynamic: #2a2540;
  --color-divider:        #2e2945;
  --color-border:         #3d3758;

  --color-text:           #e8e5f5;
  --color-text-muted:     #9b96b0;
  --color-text-faint:     #6b6580;
  --color-text-inverse:   #1e1b2e;

  --color-primary:        #a78bfa;
  --color-primary-hover:  #8b5cf6;
  --color-primary-active: #7c3aed;
  --color-primary-light:  #2e2545;

  --color-accent:         #fb923c;
  --color-accent-hover:   #f97316;
  --color-accent-light:   #2a2030;

  --color-teal:           #2dd4bf;
  --color-teal-light:     #1a2a2a;

  --color-success:        #4ade80;
  --color-warning:        #facc15;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(167, 139, 250, 0.2);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #0f0d1a;
    --color-surface:        #1a1726;
    --color-surface-2:      #211d30;
    --color-surface-offset: #16132a;
    --color-surface-dynamic: #2a2540;
    --color-divider:        #2e2945;
    --color-border:         #3d3758;
    --color-text:           #e8e5f5;
    --color-text-muted:     #9b96b0;
    --color-text-faint:     #6b6580;
    --color-text-inverse:   #1e1b2e;
    --color-primary:        #a78bfa;
    --color-primary-hover:  #8b5cf6;
    --color-primary-active: #7c3aed;
    --color-primary-light:  #2e2545;
    --color-accent:         #fb923c;
    --color-accent-hover:   #f97316;
    --color-accent-light:   #2a2030;
    --color-teal:           #2dd4bf;
    --color-teal-light:     #1a2a2a;
    --color-success:        #4ade80;
    --color-warning:        #facc15;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(167, 139, 250, 0.2);
  }
}

/* ========== GLOBAL STYLES ========== */
body {
  font-family: var(--font-body);
  overflow-x: hidden;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}
a:hover {
  color: var(--color-primary-hover);
}

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

/* ========== HEADER ========== */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  padding: var(--space-4) 0;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header__logo svg {
  width: 36px;
  height: 36px;
}

.header__logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.header__logo-text span {
  color: var(--color-primary);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.header__nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
  transition: color var(--transition-interactive);
}
.header__nav a:hover {
  color: var(--color-text);
}

.lang-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-border);
  font-size: var(--text-xs);
  font-weight: 700;
  font-family: var(--font-body);
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  cursor: pointer;
  background: transparent;
  transition: background var(--transition-interactive), color var(--transition-interactive), border-color var(--transition-interactive);
}
.lang-toggle:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: background var(--transition-interactive), color var(--transition-interactive);
}
.theme-toggle:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}

/* ========== HERO ========== */
.hero {
  position: relative;
  padding: clamp(var(--space-16), 10vw, var(--space-32)) 0;
  overflow: hidden;
  text-align: center;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  filter: blur(2px);
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--color-bg) 0%, transparent 30%, transparent 70%, var(--color-bg) 100%);
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  margin-bottom: var(--space-6);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-6);
}

.hero__title .highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__desc {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto var(--space-8);
  line-height: 1.7;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition-interactive), box-shadow var(--transition-interactive);
}
.hero__cta:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-glow);
  color: var(--color-text-inverse);
}

/* ========== STATS ========== */
.stats {
  padding: var(--space-12) 0;
  border-bottom: 1px solid var(--color-divider);
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  text-align: center;
}

.stat__number {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.stat__label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* ========== APPS SECTION ========== */
.apps {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) 0;
}

.section-header {
  text-align: center;
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-16));
}

.section-header__label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
}

.section-header__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.section-header__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 560px;
  margin: var(--space-4) auto 0;
}

/* App Cards */
.apps__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.app-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  transition: box-shadow var(--transition-interactive), transform var(--transition-interactive);
  display: flex;
  flex-direction: column;
}

.app-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.app-card__header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

.app-card__icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.75rem;
}

.app-card__icon--kisstory {
  background: linear-gradient(135deg, #f97316, #ef4444);
}
.app-card__icon--tonos {
  background: linear-gradient(135deg, #7c3aed, #3b82f6);
}
.app-card__icon--midwest {
  background: linear-gradient(135deg, #3b82f6, #06b6d4);
}
.app-card__icon--abc {
  background: linear-gradient(135deg, #ef4444, #f97316);
}

.app-card__info h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.app-card__category {
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: 500;
}

.app-card__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-6);
  flex: 1;
}

.app-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.app-card__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.app-card__meta-item svg {
  width: 16px;
  height: 16px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.app-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.tag {
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
}

.app-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  align-self: flex-start;
  transition: background var(--transition-interactive), box-shadow var(--transition-interactive);
}

.app-card__link:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-glow);
  color: var(--color-text-inverse);
}

.app-card__link svg {
  width: 16px;
  height: 16px;
}

/* ========== ABOUT SECTION ========== */
.about {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.about__text h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
}

.about__text p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.about__features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-bg);
  border-radius: var(--radius-lg);
}

.feature-item svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.feature-item span {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 500;
}

.about__visual {
  display: flex;
  justify-content: center;
}

.about__image {
  width: 100%;
  max-width: 440px;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about__image img {
  width: 100%;
  height: auto;
  display: block;
}

/* ========== FOOTER ========== */
.footer {
  padding: var(--space-12) 0 var(--space-8);
  border-top: 1px solid var(--color-divider);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.footer__brand svg {
  width: 28px;
  height: 28px;
}

.footer__brand-name {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
}

.footer__brand-name span {
  color: var(--color-primary);
}

.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__links {
  display: flex;
  gap: var(--space-6);
}

.footer__links a {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
.footer__links a:hover {
  color: var(--color-primary);
}

/* ========== ANIMATIONS ========== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  opacity: 0;
  animation: fadeUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  .header__nav a:not(.theme-toggle) {
    display: none;
  }

  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }

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

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

  .about__visual {
    order: -1;
  }

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

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }

  .footer__links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: clamp(1.75rem, 1rem + 3vw, 2.5rem);
  }

  .app-card {
    padding: var(--space-6);
  }

  .app-card__header {
    flex-direction: column;
  }
}