/* ========== CSS Variables ========== */
:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-card: #1a1a1a;
  --bg-card-hover: #222222;
  --border: #2a2a2a;
  --border-light: #333333;
  --text-primary: #f0f0f0;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;
  --accent-from: #00d4ff;
  --accent-to: #6366f1;
  --accent-gradient: linear-gradient(135deg, var(--accent-from) 0%, var(--accent-to) 100%);
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --container: 1200px;
  --nav-height: 64px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

ul, ol {
  list-style: none;
}

/* ========== Background Effects ========== */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 40%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 40%, transparent 70%);
}

.bg-glow {
  position: fixed;
  z-index: -1;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.4;
  pointer-events: none;
}

.bg-glow--1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.15), transparent 70%);
  top: -200px;
  right: -200px;
}

.bg-glow--2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.12), transparent 70%);
  bottom: -100px;
  left: -150px;
}

/* ========== Gradient Text ========== */
.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ========== Navigation ========== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background var(--transition), box-shadow var(--transition);
}

.nav--scrolled {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
}

.nav__container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 2px;
}

.nav__links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}

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

.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 1px;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle--open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle--open span:nth-child(2) {
  opacity: 0;
}

.nav__toggle--open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ========== Sections ========== */
.section__container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section__title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 56px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.section__title--prefix {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  font-weight: 400;
  color: var(--accent-from);
  opacity: 0.6;
  letter-spacing: 0;
}

/* ========== Hero ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  position: relative;
}

.hero__container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

.hero__greeting {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 16px;
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.hero__name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 20px;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.1s forwards;
}

.hero__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.2s forwards;
}

.hero__subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin-bottom: 28px;
  line-height: 1.7;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.3s forwards;
}

.hero__tags {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 36px;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.4s forwards;
}

.tag {
  padding: 6px 16px;
  border: 1px solid var(--border-light);
  border-radius: 50px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.03);
  transition: all var(--transition);
}

.tag:hover {
  border-color: var(--accent-from);
  color: var(--accent-from);
  background: rgba(0, 212, 255, 0.06);
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.5s forwards;
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 0.9375rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
}

.btn--primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.25);
}

.btn--primary:hover {
  box-shadow: 0 6px 30px rgba(0, 212, 255, 0.4);
  transform: translateY(-1px);
}

.btn--ghost {
  border: 1px solid var(--border-light);
  color: var(--text-primary);
}

.btn--ghost:hover {
  border-color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
}

/* ========== About ========== */
.about {
  padding: 120px 0;
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about__timeline {
  position: relative;
  padding-left: 32px;
}

.about__timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--border-light);
}

.timeline__item {
  position: relative;
  padding-bottom: 32px;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__dot {
  position: absolute;
  left: -27px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--border-light);
  background: var(--bg-primary);
  transition: all var(--transition);
}

.timeline__dot--active {
  border-color: var(--accent-from);
  background: var(--accent-gradient);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.3);
}

.timeline__year {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent-from);
  display: inline-block;
  margin-bottom: 4px;
}

.timeline__desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.about__quote {
  margin-bottom: 40px;
  padding: 24px;
  border-left: 3px solid;
  border-image: var(--accent-gradient) 1;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.about__quote-text {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  font-style: italic;
  line-height: 1.7;
  margin-bottom: 12px;
}

.about__quote-author {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.stat {
  text-align: center;
  padding: 24px 16px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.stat:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.stat__number {
  display: block;
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.stat__label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

/* ========== Services ========== */
.services {
  padding: 120px 0;
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 0;
}

.service-card:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.service-card:hover::before {
  opacity: 0.02;
}

.service-card__icon {
  font-size: 2rem;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.service-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.service-card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  position: relative;
  z-index: 1;
}

/* ========== Works ========== */
.works {
  padding: 120px 0;
}

.works__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.work-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.work-card:hover {
  border-color: var(--accent-from);
  border-color: rgba(0, 212, 255, 0.25);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.work-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.work-card__icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 212, 255, 0.08);
  border-radius: var(--radius-sm);
  color: var(--accent-from);
}

.work-card__badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-to);
  letter-spacing: 0.05em;
}

.work-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.work-card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex: 1;
}

.work-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-from);
  transition: gap var(--transition);
}

.work-card__link:hover {
  gap: 10px;
}

/* ========== Contact ========== */
.contact {
  padding: 120px 0 160px;
}

.contact__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 32px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  cursor: pointer;
}

.contact-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.contact-card--highlight {
  border-color: rgba(0, 212, 255, 0.2);
  background: rgba(0, 212, 255, 0.03);
}

.contact-card--highlight:hover {
  border-color: rgba(0, 212, 255, 0.4);
  background: rgba(0, 212, 255, 0.06);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.1);
}

.contact-card__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius);
  margin-bottom: 16px;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.contact-card:hover .contact-card__icon {
  color: var(--accent-from);
}

.contact-card__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.contact-card__desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ========== Footer ========== */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
}

.footer__container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.footer__text {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ========== Modal ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  max-width: 360px;
  width: 100%;
  position: relative;
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.modal-overlay--open .modal {
  transform: translateY(0);
}

.modal__close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.modal__close:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.modal__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.modal__qr {
  margin-bottom: 20px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.modal__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.modal__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========== Animations ========== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll Reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ========== Responsive ========== */

/* Tablet */
@media (max-width: 1024px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: 56px;
  }

  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .works__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile */
@media (max-width: 640px) {
  :root {
    --nav-height: 56px;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    justify-content: center;
    gap: 40px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
  }

  .nav__links--open {
    opacity: 1;
    visibility: visible;
  }

  .nav__link {
    font-size: 1.25rem;
  }

  .nav__toggle {
    display: flex;
  }

  .section__title {
    font-size: 1.75rem;
    margin-bottom: 40px;
  }

  .hero {
    min-height: 100svh;
  }

  .hero__name {
    font-size: clamp(2rem, 10vw, 3rem);
  }

  .hero__title {
    font-size: 1.0625rem;
  }

  .hero__subtitle {
    font-size: 0.9375rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .about {
    padding: 80px 0;
  }

  .about__timeline {
    padding-left: 24px;
  }

  .timeline__dot {
    left: -20px;
    width: 9px;
    height: 9px;
  }

  .about__timeline::before {
    left: 4px;
  }

  .stats__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }

  .stat {
    padding: 16px 10px;
  }

  .stat__number {
    font-size: 1.375rem;
  }

  .services {
    padding: 80px 0;
  }

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

  .works {
    padding: 80px 0;
  }

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

  .contact {
    padding: 80px 0 120px;
  }

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

  .modal {
    padding: 28px 20px;
  }
}

/* Small phones */
@media (max-width: 380px) {
  .hero__tags {
    gap: 8px;
  }

  .tag {
    padding: 5px 12px;
    font-size: 0.75rem;
  }

  .btn {
    padding: 10px 22px;
    font-size: 0.875rem;
  }

  .stats__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .stat {
    padding: 12px 6px;
  }

  .stat__number {
    font-size: 1.25rem;
  }

  .stat__label {
    font-size: 0.6875rem;
  }
}