/* ============================================
   David H. Schneider — Portfolio
   Design System: Dark Theme, High Contrast
   ============================================ */

/* --- Custom Properties --- */
:root {
  /* Colors */
  --bg-primary: #08080f;
  --bg-secondary: #0e0e1a;
  --bg-card: #13132200;
  --bg-card-solid: #131322;
  --bg-card-hover: #1a1a30;
  --surface: #1a1a2e;

  --text-primary: #e8e8f0;
  --text-secondary: #9898b0;
  --text-muted: #606080;

  --accent-cyan: #00d4ff;
  --accent-purple: #7c3aed;
  --accent-magenta: #f43f5e;
  --accent-gradient: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  --accent-gradient-text: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-purple) 100%);

  --border-color: rgba(124, 58, 237, 0.15);
  --border-glow: rgba(0, 212, 255, 0.2);

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Sizing */
  --header-height: 72px;
  --container-width: 1120px;
  --section-padding: clamp(80px, 12vh, 140px);
  --gap: clamp(16px, 2vw, 24px);
  --radius: 12px;
  --radius-sm: 8px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.45, 0, 0.15, 1);
  --duration: 0.4s;
}

/* --- Reset --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--duration) var(--ease-out);
}

a:hover {
  color: var(--accent-purple);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul {
  list-style: none;
}

/* --- Utility --- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--gap);
}

.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: 0.3em;
  background: var(--accent-gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

/* --- 3D Canvas --- */
#three-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* --- Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 100;
  transition: background var(--duration) var(--ease-out),
              box-shadow var(--duration) var(--ease-out);
}

.site-header.scrolled {
  background: rgba(8, 8, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border-color);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--gap);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.logo {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  gap: 2px;
}

.logo:hover {
  color: var(--text-primary);
}

.logo-bracket {
  color: var(--accent-cyan);
  transition: color var(--duration) var(--ease-out);
}

.logo:hover .logo-bracket {
  color: var(--accent-purple);
}

.logo-name {
  background: var(--accent-gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Navigation */
.nav-list {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  position: relative;
  padding: 4px 0;
  transition: color var(--duration) var(--ease-out);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 1px;
  transition: width var(--duration) var(--ease-out);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  gap: 2px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 3px;
  border: 1px solid var(--border-color);
}

.lang-btn {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  background: none;
  border: none;
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s var(--ease-out);
}

.lang-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.lang-btn.active {
  color: var(--bg-primary);
  background: var(--accent-cyan);
  font-weight: 600;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 110;
}

.menu-bar {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s var(--ease-out);
  transform-origin: center;
}

.menu-toggle.open .menu-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.open .menu-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.menu-toggle.open .menu-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  padding: var(--header-height) var(--gap) 0;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
  filter: blur(2px) saturate(0.7);
  transform: scale(1.05);
  transition: opacity 1.5s var(--ease-smooth);
}

.hero-content {
  text-align: center;
  max-width: 800px;
  position: relative;
  z-index: 2;
}

.hero-greeting {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 400;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  margin-bottom: 0.8rem;
  opacity: 0;
  transform: translateY(20px);
}

.hero-name {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1rem;
  background: var(--accent-gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0;
  transform: translateY(30px);
}

.hero-tagline {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: var(--text-secondary);
  font-weight: 300;
  margin-bottom: 2.5rem;
  opacity: 0;
  transform: translateY(20px);
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  transform: translateY(20px);
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0;
  animation: fadeInUp 1s 2s forwards;
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--accent-cyan), transparent);
  animation: scrollPulse 2s infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); }
}

@keyframes fadeInUp {
  to { opacity: 0.6; }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 12px 28px;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--duration) var(--ease-out);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: var(--bg-primary);
  font-weight: 600;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.25);
  color: var(--bg-primary);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-glow);
}

.btn-outline:hover {
  border-color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.05);
  transform: translateY(-2px);
  color: var(--text-primary);
}

/* --- About --- */
.about {
  z-index: 1;
  position: relative;
}

.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  align-items: start;
}

.about-portrait {
  position: relative;
}

.portrait-frame {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 2px solid var(--border-color);
  transition: border-color var(--duration) var(--ease-out);
}

.portrait-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(8, 8, 15, 0.6) 100%);
  pointer-events: none;
}

.portrait-frame:hover {
  border-color: var(--accent-cyan);
}

.portrait-frame img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s var(--ease-smooth);
}

.portrait-frame:hover img {
  transform: scale(1.03);
}

.about-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.about-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 700px;
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

.highlight-card {
  text-align: center;
  padding: 2rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: all var(--duration) var(--ease-out);
}

.highlight-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.highlight-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  display: block;
}

.highlight-value {
  font-size: 2.2rem;
  font-weight: 700;
  background: var(--accent-gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: block;
  margin-bottom: 0.2rem;
  font-family: var(--font-mono);
}

.highlight-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --- Skills --- */
.skills {
  z-index: 1;
  position: relative;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.skill-category {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: border-color var(--duration) var(--ease-out);
}

.skill-category:hover {
  border-color: var(--border-glow);
}

.skill-category-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.skill-items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-tag {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 2rem;
  transition: border-color var(--duration) var(--ease-out), background var(--duration) var(--ease-out);
}

.skill-category:hover .skill-tag {
  border-color: var(--border-glow);
}

/* --- Ventures --- */
.ventures {
  z-index: 1;
  position: relative;
}

.ventures-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--gap);
  margin-top: 2rem;
}

.venture-card {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: all var(--duration) var(--ease-out);
  display: flex;
  flex-direction: column;
}

.venture-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.venture-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.venture-icon {
  font-size: 1.8rem;
  line-height: 1;
}

.venture-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
}

.venture-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.2rem;
  flex: 1;
}

.venture-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 1rem;
}

.venture-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 4px 10px;
  background: rgba(0, 212, 255, 0.08);
  color: var(--accent-cyan);
  border-radius: 20px;
  border: 1px solid rgba(0, 212, 255, 0.15);
}

.venture-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent-cyan);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--duration) var(--ease-out);
}

.venture-link:hover {
  gap: 10px;
}

/* --- Engagement --- */
.engagement {
  z-index: 1;
  position: relative;
}

.engagement-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.engagement-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--gap);
}

.engagement-card {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: all var(--duration) var(--ease-out);
}

.engagement-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.engagement-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: block;
}

.engagement-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}

.engagement-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Speaker --- */
.speaker {
  z-index: 1;
  position: relative;
}

.speaker-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.speaker-topics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--gap);
  margin-bottom: 2.5rem;
}

.speaker-topic {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: all var(--duration) var(--ease-out);
}

.speaker-topic:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.speaker-topic-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
}

.speaker-topic-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
}

.speaker-cta {
  text-align: center;
  margin-top: 1rem;
}

/* --- Contact --- */
.contact {
  z-index: 1;
  position: relative;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-portrait {
  width: 180px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 2px solid var(--border-color);
  margin-bottom: 1.5rem;
  transition: border-color var(--duration) var(--ease-out);
}

.contact-portrait:hover {
  border-color: var(--accent-cyan);
}

.contact-portrait img {
  width: 100%;
  height: auto;
  display: block;
  filter: saturate(0.9);
  transition: filter 0.4s var(--ease-out);
}

.contact-portrait:hover img {
  filter: saturate(1);
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  transition: border-color var(--duration) var(--ease-out);
}

.contact-card:hover {
  border-color: var(--border-glow);
}

.contact-icon {
  font-size: 1.3rem;
}

.contact-link {
  font-size: 0.95rem;
  color: var(--text-primary);
  word-break: break-all;
}

.contact-buttons {
  margin-top: 1.5rem;
}

.contact-form-wrap {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

.form-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--duration) var(--ease-out);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%239898b0' fill='none' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

.form-group input[type="date"] {
  color-scheme: dark;
}

.btn-submit {
  width: 100%;
  justify-content: center;
  margin-top: 0.5rem;
}

/* --- Footer --- */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  position: relative;
  z-index: 1;
}

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

.footer-copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-nav {
  display: flex;
  gap: 2rem;
}

.footer-nav a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--duration) var(--ease-out);
}

.footer-nav a:hover {
  color: var(--text-primary);
}

/* --- GSAP Animation States --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
}

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

/* --- Responsive --- */

/* Tablet */
@media (max-width: 900px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .about-grid {
    grid-template-columns: 220px 1fr;
  }

  .about-highlights {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Mobile */
@media (max-width: 700px) {
  :root {
    --header-height: 60px;
  }

  .menu-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(8, 8, 15, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: calc(var(--header-height) + 2rem) 2rem 2rem;
    transition: right 0.4s var(--ease-out);
    border-left: 1px solid var(--border-color);
    z-index: 105;
  }

  .main-nav.open {
    right: 0;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .nav-link {
    display: block;
    padding: 1rem 0;
    font-size: 1.1rem;
    border-bottom: 1px solid var(--border-color);
  }

  .nav-link::after {
    display: none;
  }

  .lang-switcher {
    gap: 1px;
    padding: 2px;
  }

  .lang-btn {
    font-size: 0.65rem;
    padding: 3px 6px;
  }

  .hero-name {
    font-size: clamp(2rem, 10vw, 3.5rem);
  }

  .about-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-portrait {
    max-width: 220px;
    margin: 0 auto;
  }

  .about-highlights {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .contact-portrait {
    width: 140px;
    margin: 0 auto 1.5rem;
  }

  .highlight-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-align: left;
    padding: 1.2rem 1.5rem;
  }

  .highlight-icon {
    margin-bottom: 0;
    font-size: 1.5rem;
  }

  .highlight-value {
    font-size: 1.5rem;
  }

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

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

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

  .speaker-topics {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .hero-greeting,
  .hero-name,
  .hero-tagline,
  .hero-actions {
    opacity: 1;
    transform: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}