/* =========================================
   Habie Web — Main Stylesheet
   Deep Violet Glass Design System
   ========================================= */

:root {
  /* Brand: Deep Violet Glass */
  --color-violet-50:  #F4EEFF;
  --color-violet-100: #E5D6FF;
  --color-violet-200: #C8AEFF;
  --color-violet-300: #A57DEE;
  --color-violet-400: #8A5CDD;
  --color-violet-500: #7848CC;
  --color-violet-600: #5230A8;
  --color-violet-700: #3A1F7C;
  --color-violet-800: #261252;
  --color-violet-900: #1a0f2e;

  /* Aurora accent */
  --color-aurora-rose: #FF8FB8;
  --color-aurora-peach: #FFB99B;
  --color-aurora-sky: #9DCFFF;

  /* Neutral */
  --color-ink:        #1a1325;
  --color-ink-soft:   #4a3f5c;
  --color-ink-muted:  #7a6f8c;
  --color-line:       rgba(120, 72, 204, 0.12);
  --color-line-strong: rgba(120, 72, 204, 0.24);

  /* Surfaces */
  --surface-page:     #FBF8FF;
  --surface-card:     rgba(255, 255, 255, 0.72);
  --surface-card-strong: rgba(255, 255, 255, 0.88);
  --surface-glass:    rgba(255, 255, 255, 0.55);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;

  /* Shadows */
  --shadow-soft: 0 1px 2px rgba(38, 18, 82, 0.04), 0 8px 24px rgba(38, 18, 82, 0.06);
  --shadow-glass: 0 1px 1px rgba(255,255,255,0.6) inset, 0 8px 32px rgba(82, 48, 168, 0.10);
  --shadow-lift: 0 1px 2px rgba(38, 18, 82, 0.06), 0 24px 48px rgba(82, 48, 168, 0.14);

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 160ms;
  --duration-base: 240ms;

  /* Layout */
  --container-max: 1200px;
  --content-max:   780px;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-ink:        #F4EEFF;
    --color-ink-soft:   #C8B8E0;
    --color-ink-muted:  #8E7FA8;
    --color-line:       rgba(200, 174, 255, 0.10);
    --color-line-strong: rgba(200, 174, 255, 0.20);

    --surface-page:     #0F0820;
    --surface-card:     rgba(38, 18, 82, 0.55);
    --surface-card-strong: rgba(38, 18, 82, 0.78);
    --surface-glass:    rgba(58, 31, 124, 0.40);

    --shadow-soft: 0 1px 2px rgba(0, 0, 0, 0.30), 0 8px 24px rgba(0, 0, 0, 0.20);
    --shadow-glass: 0 1px 1px rgba(200, 174, 255, 0.10) inset, 0 8px 32px rgba(0, 0, 0, 0.40);
    --shadow-lift: 0 1px 2px rgba(0, 0, 0, 0.30), 0 24px 48px rgba(0, 0, 0, 0.40);
  }
}

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

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

html {
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-ink);
  background: var(--surface-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "palt" 1;
  letter-spacing: 0.01em;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

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

a {
  color: var(--color-violet-600);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

@media (prefers-color-scheme: dark) {
  a { color: var(--color-violet-200); }
}

a:hover { color: var(--color-violet-400); }

a:focus-visible {
  outline: 2px solid var(--color-violet-400);
  outline-offset: 3px;
  border-radius: 4px;
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-violet-50);
  color: var(--color-violet-700);
  padding: 0.15em 0.45em;
  border-radius: 6px;
  border: 1px solid var(--color-line);
}

@media (prefers-color-scheme: dark) {
  code {
    background: rgba(120, 72, 204, 0.18);
    color: var(--color-violet-100);
  }
}

/* =========================================
   Container
   ========================================= */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

/* =========================================
   Aurora Background
   ========================================= */

.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.aurora__layer {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  animation: aurora-drift 24s ease-in-out infinite;
}

.aurora__layer--1 {
  width: 60vw; height: 60vw;
  top: -20vw; left: -10vw;
  background: radial-gradient(circle, var(--color-violet-200) 0%, transparent 70%);
}

.aurora__layer--2 {
  width: 50vw; height: 50vw;
  top: 30vh; right: -15vw;
  background: radial-gradient(circle, var(--color-aurora-rose) 0%, transparent 70%);
  opacity: 0.32;
  animation-delay: -8s;
}

.aurora__layer--3 {
  width: 55vw; height: 55vw;
  bottom: -20vw; left: 30vw;
  background: radial-gradient(circle, var(--color-violet-300) 0%, transparent 70%);
  opacity: 0.40;
  animation-delay: -16s;
}

@media (prefers-color-scheme: dark) {
  .aurora__layer { opacity: 0.32; }
  .aurora__layer--2 { opacity: 0.18; }
  .aurora__layer--3 { opacity: 0.22; }
}

@keyframes aurora-drift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%      { transform: translate(8vw, -6vh) scale(1.08); }
  66%      { transform: translate(-6vw, 6vh) scale(0.94); }
}

@media (prefers-reduced-motion: reduce) {
  .aurora__layer { animation: none; }
  html { scroll-behavior: auto; }
}

/* =========================================
   Site Header
   ========================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface-glass);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-line);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-ink);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.site-logo:hover { color: var(--color-violet-600); }

.site-logo__mark {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-violet-200), var(--color-violet-600));
  color: white;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  box-shadow: var(--shadow-soft);
}

.site-logo__text {
  font-family: var(--font-display);
  font-size: 1.2rem;
}

.site-nav {
  display: flex;
  gap: var(--space-5);
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--color-ink-soft);
  font-weight: 500;
}

.site-nav a[aria-current="page"] {
  color: var(--color-violet-600);
}

@media (prefers-color-scheme: dark) {
  .site-nav a[aria-current="page"] { color: var(--color-violet-200); }
}

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

.site-footer {
  margin-top: var(--space-9);
  padding-block: var(--space-7);
  border-top: 1px solid var(--color-line);
  background: var(--surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-footer .container {
  text-align: center;
}

.site-footer__tagline {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--color-ink-soft);
  margin: 0 0 var(--space-3);
  letter-spacing: 0.02em;
}

.site-footer__copy {
  font-size: 0.85rem;
  color: var(--color-ink-muted);
  margin: 0;
}

/* =========================================
   Glass Card
   ========================================= */

.glass-card {
  background: var(--surface-card);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glass);
  padding: clamp(var(--space-5), 4vw, var(--space-7));
}