/* ==========================================
   GeoRain — Google Material Style
   ========================================== */

/* ========== Design Tokens ========== */
:root {
  /* Google palette */
  --blue: #4285f4;
  --blue-dark: #1a73e8;
  --red: #ea4335;
  --green-dark: #1e8e3e;
  --yellow-dark: #f9ab00;

  /* Light theme */
  --surface: #ffffff;
  --surface-variant: #f8f9fa;
  --surface-hover: #f1f3f4;
  --on-surface: #202124;
  --on-surface-variant: #5f6368;
  --outline: #dadce0;

  /* Typography */
  --font-display: 'Google Sans', 'Noto Sans SC', sans-serif;
  --font-body: 'Roboto', 'Noto Sans SC', sans-serif;
  --font-mono: 'Roboto Mono', 'Fira Code', 'JetBrains Mono', monospace;

  /* Transitions */
  --ease-standard: cubic-bezier(0.4, 0.0, 0.2, 1);
  --duration-medium: 0.25s;
}

[data-theme="dark"] {
  --surface: #202124;
  --surface-variant: #303134;
  --surface-hover: #3c4043;
  --on-surface: #e8eaed;
  --on-surface-variant: #9aa0a6;
  --outline: #5f6368;
}

/* ========== Reset ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--surface);
  color: var(--on-surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--duration-medium) var(--ease-standard), color var(--duration-medium) var(--ease-standard);
}
a { color: var(--blue-dark); text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--outline); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--on-surface-variant); }

/* ========== Progress Bar ========== */
.progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  z-index: 999;
  background: linear-gradient(90deg, var(--blue), #34a853, #fbbc04, var(--red));
  transform-origin: left;
  transform: scaleX(0);
  transition: none;
}

/* ========== Main Content ========== */
.main-content {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 40px;
}

/* ========== Hero ========== */
.hero {
  padding: 120px 0 80px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-title {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.hero-greet {
  display: block;
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--on-surface-variant);
  margin-bottom: 6px;
  letter-spacing: 0;
}

.hero-name {
  display: inline-flex;
}

.name-char {
  display: inline-block;
  transition: color var(--duration-medium) var(--ease-standard);
}

.name-char.g { color: var(--blue); }
.name-char.e1 { color: var(--red); }
.name-char.o { color: var(--yellow-dark); }
.name-char.r { color: var(--blue); }
.name-char.a { color: var(--green-dark); }
.name-char.i { color: var(--red); }
.name-char.n { color: var(--blue); }

.hero-sub {
  font-size: 1.25rem;
  color: var(--on-surface-variant);
  font-weight: 400;
  line-height: 1.6;
  max-width: 480px;
}

/* ========== Theme FAB ========== */
.theme-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--outline);
  box-shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 8px rgba(0,0,0,.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--on-surface-variant);
  z-index: 200;
  transition: background var(--duration-medium) var(--ease-standard), box-shadow var(--duration-medium) var(--ease-standard);
}

.theme-fab:hover {
  background: var(--surface-hover);
  box-shadow: 0 2px 6px rgba(0,0,0,.06), 0 8px 24px rgba(0,0,0,.1);
}

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* ========== Contact ========== */
.contact {
  padding: 0 0 80px;
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--on-surface);
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  border: 1px solid var(--outline);
  border-radius: 16px;
  background: var(--surface-variant);
  color: var(--on-surface);
  text-decoration: none;
  cursor: pointer;
  transition: background var(--duration-medium) var(--ease-standard), border-color var(--duration-medium) var(--ease-standard), box-shadow var(--duration-medium) var(--ease-standard);
  position: relative;
  overflow: hidden;
}

.contact-item:hover {
  background: var(--surface-hover);
  border-color: var(--blue);
  box-shadow: 0 1px 3px rgba(0,0,0,.06), 0 4px 12px rgba(66,133,244,.12);
}

.contact-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--surface);
  color: var(--blue);
  flex-shrink: 0;
}

.contact-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: absolute;
  top: 12px;
  left: 72px;
}

.contact-value {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--on-surface);
  margin-top: 8px;
}

.contact-hint {
  font-size: 0.6875rem;
  color: var(--on-surface-variant);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--duration-medium) var(--ease-standard), transform var(--duration-medium) var(--ease-standard);
  margin-left: auto;
  white-space: nowrap;
}

.contact-item:hover .contact-hint {
  opacity: 1;
  transform: translateX(0);
}

/* Copy toast */
.copy-toast {
  position: fixed;
  bottom: 88px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: var(--on-surface);
  color: var(--surface);
  padding: 10px 24px;
  border-radius: 24px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 300;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  box-shadow: 0 4px 12px rgba(0,0,0,.15);
}

.copy-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ========== Selection ========== */
::selection {
  background: rgba(66, 133, 244, 0.2);
  color: var(--on-surface);
}

/* ========== Mobile ========== */
@media (max-width: 600px) {
  .main-content { padding: 0 20px; }
  .hero { padding: 100px 0 60px; }
  .hero-title { font-size: 2.25rem; }
  .hero-sub { font-size: 1.1rem; }
  .theme-fab { bottom: 16px; right: 16px; width: 44px; height: 44px; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact { padding: 0 0 40px; }
  .section-title { font-size: 1.25rem; }
}