/* LLM Desk Website - Design Tokens */
:root {
  --color-bg: #F4F1EA;
  --color-bg-alt: #EBE8E0;
  --color-surface: #FFFFFF;
  --color-surface-alt: #FAFAF9;
  --color-border: #E7E5E4;
  --color-border-light: #F5F5F4;
  --color-text-primary: #1F1F1F;
  --color-text-secondary: #4A4A4A;
  --color-text-muted: #787878;
  --color-text-inverse: #FAFAF9;
  --color-accent: #D9795F;
  --color-accent-hover: #C06045;
  --color-accent-bg: #FBECE8;
  --color-accent-border: #F5D8CF;
  --color-success: #16a34a;
  --font-sans: "Inter", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  --text-xs: 0.75rem; --text-sm: 0.875rem; --text-base: 1rem;
  --text-lg: 1.125rem; --text-xl: 1.25rem; --text-2xl: 1.5rem;
  --text-3xl: 1.875rem; --text-4xl: 2.25rem; --text-5xl: 3rem; --text-6xl: 3.75rem;
  --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-sm: 0.25rem; --radius-md: 0.5rem; --radius-lg: 0.75rem;
  --radius-xl: 1rem; --radius-2xl: 1.5rem; --radius-3xl: 2rem; --radius-full: 9999px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.04); --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12); --shadow-xl: 0 16px 48px rgba(0,0,0,0.16);
  --transition-fast: 0.15s ease; --transition-base: 0.3s ease;
}
.dark {
  --color-bg: #0c0a09; --color-bg-alt: #1c1917; --color-surface: #1c1917;
  --color-surface-alt: #292524; --color-border: #292524; --color-border-light: #44403c;
  --color-text-primary: #FAFAF9; --color-text-secondary: #a8a29e; --color-text-muted: #78716c;
  --color-text-inverse: #1F1F1F; --color-accent-bg: rgba(217,121,95,0.15);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3); --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body {
  font-family: var(--font-sans); font-size: var(--text-base); line-height: 1.6;
  color: var(--color-text-primary); background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--space-6); }
.section { padding: var(--space-20) 0; }
@media (min-width: 768px) { .section { padding: var(--space-32) 0; } }

/* Header */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background-color: rgba(244,241,234,0.85); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}
.dark .header { background-color: rgba(12,10,9,0.85); }
.header__inner { display: flex; align-items: center; justify-content: space-between; height: 4.5rem; }
.logo { display: flex; align-items: center; gap: var(--space-3); font-family: var(--font-mono); font-weight: 700; font-size: var(--text-xl); }
.logo__icon {
  width: 2.5rem; height: 2.5rem; border-radius: var(--radius-lg);
}
.nav { display: none; gap: var(--space-8); }
@media (min-width: 768px) { .nav { display: flex; } }
.nav__link { font-size: var(--text-sm); font-weight: 500; color: var(--color-text-secondary); transition: color var(--transition-fast); }
.nav__link:hover { color: var(--color-accent); }
.header__actions { display: flex; align-items: center; gap: var(--space-4); }
.theme-toggle {
  width: 2.5rem; height: 2.5rem; border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-secondary); transition: all var(--transition-fast);
}
.theme-toggle:hover { background-color: var(--color-surface); color: var(--color-text-primary); }
.mobile-menu-btn { display: flex; width: 2.5rem; height: 2.5rem; align-items: center; justify-content: center; color: var(--color-text-primary); }
@media (min-width: 768px) { .mobile-menu-btn { display: none; } }
.mobile-menu { display: none; position: fixed; top: 4.5rem; left: 0; right: 0; bottom: 0; background-color: var(--color-bg); padding: var(--space-6); flex-direction: column; gap: var(--space-4); z-index: 99; }
.mobile-menu.active { display: flex; }
.mobile-menu__link { padding: var(--space-4); font-size: var(--text-lg); font-weight: 500; border-radius: var(--radius-lg); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-6); font-size: var(--text-sm); font-weight: 600;
  border-radius: var(--radius-xl); transition: all var(--transition-fast); white-space: nowrap;
}
.btn--primary { background-color: var(--color-accent); color: white; }
.btn--primary:hover { background-color: var(--color-accent-hover); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn--secondary { background-color: var(--color-surface); color: var(--color-text-primary); border: 1px solid var(--color-border); }
.btn--secondary:hover { background-color: var(--color-surface-alt); }
.btn--lg { padding: var(--space-4) var(--space-8); font-size: var(--text-base); border-radius: var(--radius-2xl); }
.btn__icon { width: 1.25rem; height: 1.25rem; }

/* Hero */
.hero { padding-top: calc(4.5rem + var(--space-16)); padding-bottom: var(--space-20); text-align: center; position: relative; overflow: hidden; }
@media (min-width: 768px) { .hero { padding-top: calc(4.5rem + var(--space-24)); padding-bottom: var(--space-32); } }
.hero__bg { position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 120%; height: 100%; background: radial-gradient(ellipse 80% 50% at 50% -20%, var(--color-accent-bg) 0%, transparent 60%); pointer-events: none; }
.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-2) var(--space-4); background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-full); font-size: var(--text-sm); font-weight: 500; color: var(--color-text-secondary); margin-bottom: var(--space-6); animation: fadeInUp 0.6s ease; }
.hero__badge-dot { width: 0.5rem; height: 0.5rem; background-color: var(--color-success); border-radius: var(--radius-full); animation: pulse 2s infinite; }
.hero__title { font-family: var(--font-mono); font-size: var(--text-4xl); font-weight: 700; line-height: 1.1; margin-bottom: var(--space-6); animation: fadeInUp 0.6s ease 0.1s both; }
@media (min-width: 768px) { .hero__title { font-size: var(--text-6xl); } }
.hero__title-accent { color: var(--color-accent); }
.hero__subtitle { font-size: var(--text-lg); color: var(--color-text-secondary); max-width: 600px; margin: 0 auto var(--space-10); animation: fadeInUp 0.6s ease 0.2s both; }
@media (min-width: 768px) { .hero__subtitle { font-size: var(--text-xl); } }
.hero__actions { display: flex; flex-direction: column; gap: var(--space-4); justify-content: center; animation: fadeInUp 0.6s ease 0.3s both; }
@media (min-width: 480px) { .hero__actions { flex-direction: row; } }
.hero__platforms { margin-top: var(--space-8); display: flex; align-items: center; justify-content: center; gap: var(--space-6); color: var(--color-text-muted); font-size: var(--text-sm); }
.hero__platforms svg { width: 1.5rem; height: 1.5rem; opacity: 0.6; }

/* Features */
.features { background-color: var(--color-surface); }
.section__header { text-align: center; max-width: 600px; margin: 0 auto var(--space-16); }
.section__label { display: inline-block; font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-accent); margin-bottom: var(--space-4); }
.section__title { font-family: var(--font-mono); font-size: var(--text-3xl); font-weight: 700; margin-bottom: var(--space-4); }
@media (min-width: 768px) { .section__title { font-size: var(--text-4xl); } }
.section__subtitle { font-size: var(--text-lg); color: var(--color-text-secondary); }
.features__grid { display: grid; grid-template-columns: 1fr; gap: var(--space-6); }
@media (min-width: 640px) { .features__grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .features__grid { grid-template-columns: repeat(3, 1fr); } }
.feature-card { padding: var(--space-8); background-color: var(--color-bg); border-radius: var(--radius-2xl); border: 1px solid var(--color-border); transition: all var(--transition-base); }
.feature-card:hover { transform: translateY(-4px); border-color: var(--color-accent-border); }
.feature-card__icon { width: 3rem; height: 3rem; background-color: var(--color-accent-bg); border-radius: var(--radius-xl); display: flex; align-items: center; justify-content: center; color: var(--color-accent); margin-bottom: var(--space-5); }
.feature-card__title { font-family: var(--font-mono); font-size: var(--text-lg); font-weight: 600; margin-bottom: var(--space-3); }
.feature-card__description { font-size: var(--text-sm); color: var(--color-text-secondary); line-height: 1.7; }

/* Showcase */
.showcase { position: relative; overflow: hidden; }
.showcase__bg { position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 150%; height: 60%; background: radial-gradient(ellipse 60% 80% at 50% 100%, var(--color-accent-bg) 0%, transparent 60%); pointer-events: none; }
.showcase__window { position: relative; max-width: 1000px; margin: 0 auto; background-color: var(--color-surface); border-radius: var(--radius-xl); border: 1px solid var(--color-border); box-shadow: var(--shadow-xl); overflow: hidden; }
.showcase__titlebar { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-5); background-color: var(--color-surface-alt);}
.showcase__dot { width: 0.6rem; height: 0.6rem; border-radius: var(--radius-full); }
.showcase__dot--red { background-color: #ff5f57; }
.showcase__dot--yellow { background-color: #febc2e; }
.showcase__dot--green { background-color: #28c840; }
.showcase__content {display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-surface) 100%); }
.showcase__image { width: 100%; height: auto;}
.showcase__image--light { display: block; }
.showcase__image--dark { display: none; }
.dark .showcase__image--light { display: none; }
.dark .showcase__image--dark { display: block; }

/* Download */
.download { background-color: var(--color-surface); }
.download__cards { display: grid; grid-template-columns: 1fr; gap: var(--space-6); max-width: 900px; margin: 0 auto; }
@media (min-width: 768px) { .download__cards { grid-template-columns: repeat(3, 1fr); } }
.download-card { padding: var(--space-8); background-color: var(--color-bg); border-radius: var(--radius-2xl); border: 1px solid var(--color-border); text-align: center; transition: all var(--transition-base); }
.download-card:hover { transform: translateY(-4px); border-color: var(--color-accent); }
.download-card__icon { width: 3rem; height: 3rem; margin: 0 auto var(--space-5); color: var(--color-text-primary); }
.download-card__platform { font-family: var(--font-mono); font-size: var(--text-lg); font-weight: 600; margin-bottom: var(--space-2); }
.download-card__arch { font-size: var(--text-sm); color: var(--color-text-muted); margin-bottom: var(--space-6); }
.download-card .btn { width: 100%; }

/* Footer */
.footer { padding: var(--space-12) 0; border-top: 1px solid var(--color-border); }
.footer__inner { display: flex; flex-direction: column; gap: var(--space-8); align-items: center; text-align: center; }
@media (min-width: 768px) { .footer__inner { flex-direction: row; justify-content: space-between; text-align: left; } }
.footer__brand { display: flex; flex-direction: column; gap: var(--space-3); align-items: center; }
@media (min-width: 768px) { .footer__brand { align-items: flex-start; } }
.footer__tagline { font-size: var(--text-sm); color: var(--color-text-muted); }
.footer__links { display: flex; gap: var(--space-8); }
.footer__link { font-size: var(--text-sm); color: var(--color-text-secondary); transition: color var(--transition-fast); }
.footer__link:hover { color: var(--color-accent); }
.footer__bottom { padding-top: var(--space-8); border-top: 1px solid var(--color-border); text-align: center; }
.footer__copyright { font-size: var(--text-sm); color: var(--color-text-muted); }

/* Animations */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }

/* Mobile Styles */
@media (max-width: 768px) {
  .header__actions .btn--primary {
    display: none;
  }
}