/* ═══════════════════════════════════════════
   RESET & VARIABLES
   ═══════════════════════════════════════════ */

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

:root {
  --bg: #0a0a0b;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  --text: #e4e4e7;
  --text-muted: #71717a;
  --text-dim: #52525b;
  --accent: #a78bfa;
  --accent-hover: #c4b5fd;
  --nav-bg: rgba(10, 10, 11, 0.6);
  --nav-bg-scrolled: rgba(10, 10, 11, 0.85);
  --card-gradient-from: rgba(167, 139, 250, 0.05);
  --card-gradient-to: rgba(167, 139, 250, 0.02);
  --tag-bg: rgba(167, 139, 250, 0.08);
  --btn-primary-text: #0a0a0b;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --radius: 10px;
  --max-w: 1080px;
}

[data-theme="light"] {
  --bg: #f8f8fa;
  --bg-card: rgba(0, 0, 0, 0.02);
  --bg-card-hover: rgba(0, 0, 0, 0.04);
  --border: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.16);
  --text: #18181b;
  --text-muted: #52525b;
  --text-dim: #a1a1aa;
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --nav-bg: rgba(248, 248, 250, 0.6);
  --nav-bg-scrolled: rgba(248, 248, 250, 0.85);
  --card-gradient-from: rgba(124, 58, 237, 0.06);
  --card-gradient-to: rgba(124, 58, 237, 0.02);
  --tag-bg: rgba(124, 58, 237, 0.08);
  --btn-primary-text: #ffffff;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

/* ═══════════════════════════════════════════
   NAV
   ═══════════════════════════════════════════ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1.5rem, 4vw, 3rem);
  height: 56px;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}

.nav--scrolled {
  border-bottom-color: var(--border);
  background: var(--nav-bg-scrolled);
}

.nav__right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav__logo {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  transition: color 0.2s;
}

.nav__logo:hover {
  color: var(--accent);
}

.nav__links {
  display: flex;
  gap: 2rem;
}

.nav__links a {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  transition: color 0.2s;
  text-transform: uppercase;
}

.nav__links a:hover {
  color: var(--text);
}

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

.nav__toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text);
  transition: transform 0.3s var(--ease), opacity 0.2s;
}

/* ═══════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════ */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 56px clamp(1.5rem, 4vw, 3rem) 0;
}

.hero__content {
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
}

.hero__greeting {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.hero__name {
  font-size: clamp(2.8rem, 8vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__tagline {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 480px;
  margin-bottom: 2rem;
  line-height: 1.5;
}

.hero__cta {
  display: flex;
  gap: 0.75rem;
}

.hero__scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-dim);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-dim), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* ═══════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════ */

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.6rem 1.5rem;
  font-size: 0.82rem;
  font-weight: 600;
  font-family: var(--font);
  letter-spacing: 0.01em;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.25s var(--ease);
  border: 1px solid transparent;
}

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

.btn--primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border);
}

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

.btn--lg {
  padding: 0.8rem 2.2rem;
  font-size: 0.9rem;
}

/* ═══════════════════════════════════════════
   SECTIONS
   ═══════════════════════════════════════════ */

.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 5rem clamp(1.5rem, 4vw, 3rem);
}

.section__header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.section__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.section__title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* ═══════════════════════════════════════════
   PROJECT CARDS
   ═══════════════════════════════════════════ */

.projects__category {
  margin-bottom: 3rem;
}

.projects__category:last-child {
  margin-bottom: 0;
}

.projects__category-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.35s var(--ease);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-3px);
}

.card__img {
  height: 180px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--card-gradient-from), var(--card-gradient-to));
}

.card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s var(--ease), opacity 0.3s;
  opacity: 0.9;
}

.card:hover .card__img img {
  transform: scale(1.05);
  opacity: 1;
}

.card__img-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: var(--text-dim);
}

.card__img-placeholder svg {
  width: 40px;
  height: 40px;
  opacity: 0.35;
  transition: opacity 0.3s, transform 0.3s var(--ease);
}

.card:hover .card__img-placeholder svg {
  opacity: 0.6;
  transform: scale(1.1);
}

.card__body {
  padding: 1rem 1.25rem 1.25rem;
  flex: 1;
}

.card__year {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.card__title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0.25rem 0 0.4rem;
  letter-spacing: -0.01em;
}

.card__desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.card__tags span {
  font-size: 0.65rem;
  font-weight: 500;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: var(--tag-bg);
  color: var(--accent);
  letter-spacing: 0.02em;
}

.card__arrow {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.1rem;
  color: var(--text-dim);
  transition: color 0.2s, transform 0.3s var(--ease);
}

.card:hover .card__arrow {
  color: var(--accent);
  transform: translateX(3px);
}

/* Mini card (no image) */
.card--mini {
  background: linear-gradient(135deg, var(--card-gradient-from), var(--bg-card));
}

.card--mini .card__body {
  padding: 1.25rem;
}

/* ═══════════════════════════════════════════
   ABOUT
   ═══════════════════════════════════════════ */

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

.about__text p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.about__text p:last-child {
  margin-bottom: 0;
}

.skill-group {
  margin-bottom: 1.25rem;
}

.skill-group:last-child {
  margin-bottom: 0;
}

.skill-group h4 {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.skill-tags span {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.3rem 0.65rem;
  border-radius: 5px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: all 0.2s;
}

.skill-tags span:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ═══════════════════════════════════════════
   CONTACT
   ═══════════════════════════════════════════ */

.contact {
  text-align: center;
  padding: 6rem clamp(1.5rem, 4vw, 3rem);
}

.contact__content {
  max-width: 480px;
  margin: 0 auto;
}

.contact .section__title {
  font-size: 2rem;
  margin-top: 0.5rem;
  margin-bottom: 1rem;
}

.contact__text {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.6;
}

/* ═══════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════ */

.footer {
  border-top: 1px solid var(--border);
}

.footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.5rem clamp(1.5rem, 4vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.footer__links {
  display: flex;
  gap: 1.25rem;
}

.footer__links a {
  color: var(--text-muted);
  transition: color 0.2s;
}

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

/* ═══════════════════════════════════════════
   THEME TOGGLE
   ═══════════════════════════════════════════ */

.theme-toggle {
  position: relative;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  color: var(--text-muted);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  flex-shrink: 0;
}

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

.theme-toggle__icon {
  width: 18px;
  height: 18px;
  position: absolute;
  transition: opacity 0.3s, transform 0.3s var(--ease);
}

/* Dark mode: show sun icon (click to go light) */
.theme-toggle__icon--sun {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

.theme-toggle__icon--moon {
  opacity: 0;
  transform: scale(0.6) rotate(-30deg);
}

/* Light mode: show moon icon (click to go dark) */
[data-theme="light"] .theme-toggle__icon--sun {
  opacity: 0;
  transform: scale(0.6) rotate(30deg);
}

[data-theme="light"] .theme-toggle__icon--moon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

/* Smooth theme transition on body */
body,
.nav,
.card,
.card__img,
.btn,
.skill-tags span,
.footer {
  transition: background 0.4s var(--ease), color 0.4s var(--ease), border-color 0.4s var(--ease);
}

/* ═══════════════════════════════════════════
   MODAL
   ═══════════════════════════════════════════ */

.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease);
}

.modal--open {
  opacity: 1;
  pointer-events: auto;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.modal__container {
  position: relative;
  width: 100%;
  max-width: 720px;
  max-height: 85vh;
  overflow-y: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  transform: translateY(20px) scale(0.97);
  transition: transform 0.35s var(--ease);
}

.modal--open .modal__container {
  transform: translateY(0) scale(1);
}

.modal__close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  z-index: 10;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.modal__close:hover {
  color: var(--text);
  border-color: var(--border-hover);
}

.modal__hero {
  width: 100%;
  max-height: 340px;
  overflow: hidden;
  border-radius: 14px 14px 0 0;
  background: linear-gradient(135deg, var(--card-gradient-from), var(--card-gradient-to));
}

.modal__hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.modal__body {
  padding: 1.5rem 2rem 2rem;
}

.modal__year {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.modal__title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0.25rem 0 0.75rem;
}

.modal__desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.modal__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
}

.modal__tags span {
  font-size: 0.68rem;
  font-weight: 500;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  background: var(--tag-bg);
  color: var(--accent);
}

.modal__links {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.modal__links:empty {
  display: none;
}

.modal__links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 1rem;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 6px;
  transition: all 0.2s var(--ease);
}

.modal__links a.btn--primary {
  background: var(--accent);
  color: var(--btn-primary-text);
}

.modal__links a.btn--primary:hover {
  background: var(--accent-hover);
}

.modal__links a.btn--outline {
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.modal__links a.btn--outline:hover {
  border-color: var(--border-hover);
  color: var(--text);
}

.modal__gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.5rem;
}

.modal__gallery:empty {
  display: none;
}

.modal__gallery img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: transform 0.2s var(--ease), border-color 0.2s;
}

.modal__gallery img:hover {
  transform: scale(1.02);
  border-color: var(--border-hover);
}

/* Scrollbar inside modal */
.modal__container::-webkit-scrollbar {
  width: 6px;
}

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

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

@media (max-width: 768px) {
  .modal {
    padding: 1rem;
  }

  .modal__body {
    padding: 1.25rem 1.25rem 1.5rem;
  }

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

/* ═══════════════════════════════════════════
   REVEAL ANIMATION
   ═══════════════════════════════════════════ */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

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

/* Stagger children in hero */
.hero .reveal:nth-child(1) { transition-delay: 0.1s; }
.hero .reveal:nth-child(2) { transition-delay: 0.2s; }
.hero .reveal:nth-child(3) { transition-delay: 0.35s; }
.hero .reveal:nth-child(4) { transition-delay: 0.5s; }

/* ═══════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════ */

@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--nav-bg-scrolled);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s var(--ease), opacity 0.25s;
  }

  .nav__links--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__links a {
    display: block;
    padding: 0.75rem clamp(1.5rem, 4vw, 3rem);
  }

  .nav__toggle--active span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
  }

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

  .nav__toggle--active span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
  }

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

  .about__content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

@media (max-width: 480px) {
  .hero__name {
    font-size: 2.2rem;
  }

  .section {
    padding: 3.5rem 1.25rem;
  }

  .contact {
    padding: 4rem 1.25rem;
  }
}