/* ========================================
   AlphaZx — Monochrome SaaS
   ======================================== */

:root {
  --bg: #fafafa;
  --bg-elevated: #ffffff;
  --bg-subtle: #f5f5f5;
  --text: #171717;
  --text-secondary: #525252;
  --text-muted: #737373;
  --border: #e5e5e5;
  --border-strong: #d4d4d4;
  --accent: #171717;
  --accent-inverse: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-pill: 9999px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.02);
  --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.03);
}

.dark {
  --bg: #0a0a0a;
  --bg-elevated: #111111;
  --bg-subtle: #171717;
  --text: #f5f5f5;
  --text-secondary: #a3a3a3;
  --text-muted: #737373;
  --border: #262626;
  --border-strong: #404040;
  --accent: #ffffff;
  --accent-inverse: #171717;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.4), 0 2px 4px rgba(0, 0, 0, 0.3);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Navigation
   ======================================== */
.nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(250, 250, 250, 0.85);
  border-bottom: 1px solid var(--border);
}

@supports (backdrop-filter: blur(12px)) {
  .nav-bar {
    background: rgba(250, 250, 250, 0.72);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }
}

.dark .nav-bar {
  background: rgba(10, 10, 10, 0.85);
}

@supports (backdrop-filter: blur(12px)) {
  .dark .nav-bar {
    background: rgba(10, 10, 10, 0.72);
  }
}

.nav-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}

.nav-logo:hover {
  opacity: 0.7;
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.theme-toggle:hover {
  border-color: var(--border-strong);
  background: var(--bg-subtle);
}

/* ========================================
   Layout
   ======================================== */
.container {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

main {
  padding-top: 64px;
}

section {
  padding: 5rem 0;
}

/* ========================================
   Hero
   ======================================== */
.hero {
  padding: 6rem 0 4rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 32rem;
  line-height: 1.7;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ========================================
   Buttons & Links
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-inverse);
  border-color: var(--accent);
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  border-color: var(--border-strong);
  background: var(--bg-subtle);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.social-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.social-btn:hover {
  border-color: var(--border-strong);
  color: var(--text);
  background: var(--bg-subtle);
}

/* ========================================
   Tags
   ======================================== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: 500;
  background: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.tag-solid {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

/* ========================================
   Cards
   ======================================== */
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
}

/* ========================================
   Section Headers
   ======================================== */
.section-header {
  margin-bottom: 2.5rem;
}

.section-label {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.2;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  max-width: 32rem;
}

/* ========================================
   About / Profile
   ======================================== */
.profile-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
}

.profile-avatar {
  width: 72px;
  height: 72px;
  border-radius: var(--radius);
  background: var(--text);
  color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.profile-name {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.profile-role {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.profile-bio {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========================================
   Timeline
   ======================================== */
.timeline {
  position: relative;
  padding-left: 1.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -1.5rem;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 2px solid var(--border-strong);
}

.timeline-item.active .timeline-dot {
  border-color: var(--text);
  background: var(--text);
}

.timeline-role {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.125rem;
}

.timeline-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.timeline-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.timeline-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.timeline-list li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.timeline-list li::before {
  content: '—';
  color: var(--text-muted);
  flex-shrink: 0;
}

/* ========================================
   Tools
   ======================================== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.tool-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.tool-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.tool-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: var(--bg-subtle);
  color: var(--text);
  font-size: 1rem;
  border: 1px solid var(--border);
}

.tool-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.125rem;
}

.tool-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ========================================
   Projects
   ======================================== */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.project-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.project-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
}

.project-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.project-name {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.project-name:hover {
  opacity: 0.7;
}

.project-stars {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  flex-shrink: 0;
  background: var(--bg-subtle);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-pill);
}

.project-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

.project-lang {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.project-lang-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.project-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.375rem;
  transition: color 0.15s ease;
}

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

.project-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ========================================
   Location Card
   ======================================== */
.location-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.location-main {
  flex: 1;
  min-width: 240px;
}

.location-coord-large {
  font-family: 'SF Mono', Monaco, monospace;
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.location-city {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.375rem;
}

.location-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 360px;
}

.location-meta {
  display: flex;
  gap: 2.5rem;
  flex-shrink: 0;
}

.location-meta-item {
  text-align: left;
}

.location-meta-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.375rem;
}

.location-meta-value {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.location-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse-dot 2s infinite;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  border-top: 1px solid var(--border);
  padding: 3rem 0;
  margin-top: 2rem;
}

.footer-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer-brand {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ========================================
   FAB
   ======================================== */
.fab-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  z-index: 40;
}

.fab {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, background-color 0.15s ease, transform 0.15s ease;
}

.fab:hover {
  border-color: var(--border-strong);
  background: var(--bg-subtle);
  transform: scale(1.05);
}

.fab-secondary {
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.fab-secondary.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ========================================
   Chat Window
   ======================================== */
.chat-window {
  position: fixed;
  bottom: 84px;
  right: 24px;
  width: 380px;
  max-width: calc(100vw - 48px);
  max-height: calc(100vh - 120px);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hover);
  z-index: 40;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px) scale(0.98);
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
}

.chat-window.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.chat-header {
  background: var(--text);
  color: var(--bg);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chat-header-title {
  font-size: 0.9375rem;
  font-weight: 600;
}

.chat-header-status {
  font-size: 0.75rem;
  opacity: 0.7;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.chat-header-status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
}

.chat-close {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--bg);
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.15s ease, background-color 0.15s ease;
}

.chat-close:hover {
  opacity: 1;
  background: rgba(255,255,255,0.1);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
  background: var(--bg-subtle);
  min-height: 240px;
  max-height: 360px;
}

.chat-input-area {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

.chat-input-wrap {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.chat-input {
  flex: 1;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--text);
  font-size: 0.9375rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.chat-input:focus {
  border-color: var(--border-strong);
}

.chat-input::placeholder {
  color: var(--text-muted);
}

.chat-send {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--text);
  color: var(--bg);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.15s ease;
}

.chat-send:hover {
  opacity: 0.85;
}

.chat-quick {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.quick-q {
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.quick-q:hover {
  border-color: var(--border-strong);
  color: var(--text);
  background: var(--bg-subtle);
}

/* Messages */
.message {
  display: flex;
  gap: 0.625rem;
  margin-bottom: 1rem;
}

.message-user {
  flex-direction: row-reverse;
}

.message-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6875rem;
  font-weight: 700;
  flex-shrink: 0;
}

.message-avatar-bot {
  background: var(--text);
  color: var(--bg);
}

.message-avatar-user {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
}

.message-content {
  max-width: 78%;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  line-height: 1.6;
}

.message-content-bot {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
}

.message-content-user {
  background: var(--text);
  color: var(--bg);
}

/* Typing */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 0.5rem 0;
}

.typing-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: typing 1.4s infinite ease-in-out both;
}

.typing-dot:nth-child(1) { animation-delay: -0.32s; }
.typing-dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing {
  0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
  40% { opacity: 1; transform: scale(1); }
}

/* ========================================
   Modal
   ======================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  max-width: 340px;
  width: 100%;
  text-align: center;
  transform: scale(0.96);
  transition: transform 0.2s ease;
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--bg-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  color: var(--text);
  font-size: 1.5rem;
}

.modal-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.375rem;
}

.modal-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.modal-code {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  font-family: 'SF Mono', Monaco, monospace;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.02em;
  margin-bottom: 1.25rem;
}

.modal-btn {
  width: 100%;
  padding: 0.625rem 1rem;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.modal-btn:hover {
  opacity: 0.85;
}

/* ========================================
   Scroll Reveal
   ======================================== */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
  will-change: transform, opacity;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Scrollbar
   ======================================== */
::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-strong);
}

/* ========================================
   Utilities
   ======================================== */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.gap-lg {
  gap: 2rem;
}

.text-right {
  text-align: right;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.25rem;
  }
  
  .hero-subtitle {
    font-size: 1.125rem;
  }
  
  .grid-2 {
    grid-template-columns: 1fr;
  }
  
  .tool-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .project-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
  
  .chat-window {
    width: calc(100vw - 32px);
    right: 16px;
    bottom: 80px;
  }
  
  .fab-container {
    right: 16px;
    bottom: 16px;
  }
  
  section {
    padding: 3rem 0;
  }
  
  .location-card {
    padding: 1.75rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }
  
  .location-coord-large {
    font-size: 1.5rem;
  }
  
  .location-meta {
    width: 100%;
    justify-content: space-between;
  }
}

@media (max-width: 480px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-actions {
    justify-content: flex-start;
  }
}