/* ═══════════════════════════════════════════════
   DESIGN SYSTEM — Custom Properties
   ═══════════════════════════════════════════════ */
:root {
  /* Colors */
  --clr-bg:       #0D0D0D;
  --clr-surface:  #161616;
  --clr-surface-2:#1E1E1E;
  --clr-accent:   #6C3CE0;
  --clr-accent-light: #8B5CF6;
  --clr-text:     #F5F5F5;
  --clr-text-dim: #A0A0A0;
  --clr-border:   #2A2A2A;

  /* Typography */
  --ff-heading: 'Space Grotesk', sans-serif;
  --ff-body:    'Inter', sans-serif;

  --fs-xs:   0.75rem;    /* 12px */
  --fs-sm:   0.875rem;   /* 14px */
  --fs-base: 1rem;       /* 16px */
  --fs-md:   1.125rem;   /* 18px */
  --fs-lg:   1.25rem;    /* 20px */
  --fs-xl:   1.5rem;     /* 24px */
  --fs-2xl:  2rem;       /* 32px */
  --fs-3xl:  2.5rem;     /* 40px */
  --fs-4xl:  3.5rem;     /* 56px */
  --fs-hero: clamp(4rem, 12vw, 10rem);

  /* Spacing */
  --space-xs:  0.5rem;
  --space-sm:  0.75rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-section: clamp(5rem, 10vh, 8rem);

  /* Effects */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 12px 40px rgba(108, 60, 224, 0.15);

  /* Layout */
  --container-max: 1200px;
  --nav-height: 72px;
}

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

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

body {
  font-family: var(--ff-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--clr-text);
  background-color: var(--clr-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

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

input, textarea {
  font: inherit;
  color: inherit;
}

/* ═══════════════════════════════════════════════
   UTILITIES
   ═══════════════════════════════════════════════ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section-title {
  font-family: var(--ff-heading);
  font-size: var(--fs-3xl);
  font-weight: 700;
  margin-bottom: var(--space-3xl);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--clr-accent);
  border-radius: var(--radius-full);
}

/* Pills */
.pill {
  display: inline-block;
  padding: 0.3em 0.8em;
  font-size: var(--fs-sm);
  font-weight: 500;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-full);
  color: var(--clr-text-dim);
  transition: var(--transition);
}

.pill:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent-light);
}

.pill--sm {
  font-size: var(--fs-xs);
  padding: 0.2em 0.6em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.8em 1.6em;
  font-family: var(--ff-heading);
  font-size: var(--fs-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
}

.btn--primary {
  background: var(--clr-accent);
  color: var(--clr-text);
  border: none;
}

.btn--primary:hover {
  background: var(--clr-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(108, 60, 224, 0.3);
}

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

.btn--outline:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent-light);
  transform: translateY(-2px);
}

/* ═══════════════════════════════════════════════
   NAVIGATION
   ═══════════════════════════════════════════════ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 var(--space-xl);
  background: transparent;
  transition: background 0.4s ease, backdrop-filter 0.4s ease;
}

.nav--scrolled {
  background: rgba(13, 13, 13, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
}

.nav__brand {
  font-family: var(--ff-heading);
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--clr-accent);
  letter-spacing: -0.02em;
}

.nav__links {
  display: flex;
  gap: var(--space-lg);
}

.nav__link {
  position: relative;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-text-dim);
  transition: color var(--transition);
  padding: var(--space-xs) 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--clr-accent);
  transition: width var(--transition);
}

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

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-xs);
  z-index: 1100;
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: var(--transition);
  transform-origin: center;
}

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

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

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

/* Mobile Menu Overlay */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 1050;
  background: rgba(13, 13, 13, 0.97);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

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

.mobile-menu__links {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.mobile-menu__link {
  font-family: var(--ff-heading);
  font-size: var(--fs-3xl);
  font-weight: 700;
  color: var(--clr-text);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.4s ease, transform 0.4s ease, color 0.3s ease;
}

.mobile-menu.open .mobile-menu__link {
  opacity: 1;
  transform: translateY(0);
}

.mobile-menu.open li:nth-child(1) .mobile-menu__link { transition-delay: 0.1s; }
.mobile-menu.open li:nth-child(2) .mobile-menu__link { transition-delay: 0.15s; }
.mobile-menu.open li:nth-child(3) .mobile-menu__link { transition-delay: 0.2s; }
.mobile-menu.open li:nth-child(4) .mobile-menu__link { transition-delay: 0.25s; }
.mobile-menu.open li:nth-child(5) .mobile-menu__link { transition-delay: 0.3s; }

.mobile-menu__link:hover {
  color: var(--clr-accent);
}

/* ═══════════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__spotlight {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
    rgba(108, 60, 224, 0.06),
    transparent 60%
  );
  transition: background 0.15s ease;
}

.hero__content {
  text-align: center;
  z-index: 1;
  padding: var(--space-xl);
}

.hero__name {
  font-family: var(--ff-heading);
  font-size: var(--fs-hero);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  background: linear-gradient(135deg, var(--clr-text) 0%, var(--clr-accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 80px rgba(108, 60, 224, 0.3);
  margin-bottom: var(--space-lg);
}

.hero__tagline {
  font-size: clamp(var(--fs-md), 2.5vw, var(--fs-xl));
  color: var(--clr-text-dim);
  line-height: 1.5;
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
}

.hero__socials {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
}

.hero__socials a {
  color: var(--clr-text-dim);
  transition: color var(--transition), transform var(--transition);
}

.hero__socials a:hover {
  color: var(--clr-accent-light);
  transform: translateY(-3px);
}

/* Scroll hint */
.hero__scroll-hint {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--clr-text-dim);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--clr-accent), transparent);
  animation: scrollLine 1.5s ease-in-out infinite;
}

@keyframes scrollLine {
  0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
  50%      { opacity: 1;   transform: scaleY(1); }
}

/* ═══════════════════════════════════════════════
   ABOUT
   ═══════════════════════════════════════════════ */
.about {
  padding: var(--space-section) 0;
}

.about__grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-4xl);
  align-items: center;
}

.about__text p {
  color: var(--clr-text-dim);
  margin-bottom: var(--space-lg);
  font-size: var(--fs-md);
  line-height: 1.8;
}

.about__pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-xl);
}

.about__photo {
  position: relative;
}

.about__photo img {
  border-radius: var(--radius-lg);
  aspect-ratio: 3/4;
  object-fit: cover;
  width: 100%;
  box-shadow: var(--shadow-card);
}

.about__photo::after {
  content: '';
  position: absolute;
  inset: 12px -12px -12px 12px;
  border: 2px solid var(--clr-accent);
  border-radius: var(--radius-lg);
  z-index: -1;
  transition: var(--transition);
}

.about__photo:hover::after {
  inset: 8px -8px -8px 8px;
}

/* ═══════════════════════════════════════════════
   PROJECTS
   ═══════════════════════════════════════════════ */
.projects {
  padding: var(--space-section) 0;
  background: var(--clr-surface);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-xl);
}

.project-card {
  background: var(--clr-surface-2);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--clr-border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
}

.project-card__img {
  overflow: hidden;
  aspect-ratio: 16/10;
  background: var(--clr-bg);
}

.project-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(60%);
  transition: filter 0.5s ease, transform 0.5s ease;
}

.project-card:hover .project-card__img img {
  filter: grayscale(0%);
  transform: scale(1.04);
}

.project-card__body {
  padding: var(--space-lg);
}

.project-card__body--no-img {
  padding: var(--space-2xl) var(--space-lg);
}

.project-card__title {
  font-family: var(--ff-heading);
  font-size: var(--fs-lg);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.project-card__desc {
  color: var(--clr-text-dim);
  font-size: var(--fs-sm);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.project-card__stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.project-card__links {
  display: flex;
  gap: var(--space-md);
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-accent-light);
  transition: color var(--transition);
}

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

/* ═══════════════════════════════════════════════
   GALLERY
   ═══════════════════════════════════════════════ */
.gallery {
  padding: var(--space-section) 0;
}

.gallery__subtitle {
  color: var(--clr-text-dim);
  margin-top: calc(-1 * var(--space-2xl));
  margin-bottom: var(--space-3xl);
  font-size: var(--fs-md);
}

.gallery__masonry {
  column-count: 3;
  column-gap: var(--space-md);
}

.gallery__item {
  position: relative;
  break-inside: avoid;
  margin-bottom: var(--space-md);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
}

.gallery__item img {
  width: 100%;
  display: block;
  transition: transform 0.5s ease;
}

.gallery__item:hover img {
  transform: scale(1.05);
}

.gallery__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, transparent 60%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-lg);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.gallery__item:hover .gallery__overlay {
  opacity: 1;
}

.gallery__photo-title {
  font-family: var(--ff-heading);
  font-size: var(--fs-lg);
  font-weight: 600;
}

.gallery__photo-location {
  font-size: var(--fs-sm);
  color: var(--clr-text-dim);
  margin-top: 2px;
}

/* ═══════════════════════════════════════════════
   SKILLS MARQUEE
   ═══════════════════════════════════════════════ */
.skills {
  padding: var(--space-section) 0;
  background: var(--clr-surface);
  overflow: hidden;
}

.marquee {
  margin-top: var(--space-xl);
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
  mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.marquee__track {
  display: flex;
  width: max-content;
  animation: marquee-scroll 30s linear infinite;
}

.marquee--reverse .marquee__track {
  animation-direction: reverse;
}

.marquee:hover .marquee__track {
  animation-play-state: paused;
}

.marquee__content {
  display: flex;
  gap: var(--space-md);
  padding-right: var(--space-md);
}

.marquee__tag {
  flex-shrink: 0;
  padding: 0.6em 1.4em;
  font-family: var(--ff-heading);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-text-dim);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-full);
  white-space: nowrap;
  transition: border-color var(--transition), color var(--transition);
}

.marquee__tag:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent-light);
}

@keyframes marquee-scroll {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ═══════════════════════════════════════════════
   CONTACT
   ═══════════════════════════════════════════════ */
.contact {
  padding: var(--space-section) 0;
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: start;
}

/* Form */
.form-group {
  position: relative;
  margin-bottom: var(--space-xl);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-md) 0 var(--space-xs);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--clr-border);
  outline: none;
  color: var(--clr-text);
  font-size: var(--fs-base);
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  border-bottom-color: var(--clr-accent);
}

.form-group label {
  position: absolute;
  left: 0;
  top: var(--space-md);
  font-size: var(--fs-base);
  color: var(--clr-text-dim);
  pointer-events: none;
  transition: var(--transition);
}

.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
  top: -6px;
  font-size: var(--fs-xs);
  color: var(--clr-accent-light);
}

/* Hide placeholder but keep :placeholder-shown working */
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: transparent;
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-status {
  margin-top: var(--space-md);
  font-size: var(--fs-sm);
  min-height: 1.4em;
}

.form-status--success {
  color: #4ade80;
}

.form-status--error {
  color: #f87171;
}

/* Contact info */
.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.contact__info-block h3 {
  font-family: var(--ff-heading);
  font-size: var(--fs-lg);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.contact__info-block p {
  color: var(--clr-text-dim);
  line-height: 1.6;
}

.contact__info-block a {
  color: var(--clr-accent-light);
  transition: color var(--transition);
}

.contact__info-block a:hover {
  color: var(--clr-text);
}

.contact__socials {
  display: flex;
  gap: var(--space-md);
}

.contact__socials a {
  color: var(--clr-text-dim);
  transition: color var(--transition), transform var(--transition);
}

.contact__socials a:hover {
  color: var(--clr-accent-light);
  transform: translateY(-2px);
}

/* ═══════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════ */
.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--clr-border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.footer__copy {
  font-size: var(--fs-sm);
  color: var(--clr-text-dim);
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
}

.footer__links a {
  font-size: var(--fs-sm);
  color: var(--clr-text-dim);
  transition: color var(--transition);
}

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

.footer__socials {
  display: flex;
  gap: var(--space-md);
}

.footer__socials a {
  color: var(--clr-text-dim);
  transition: color var(--transition);
}

.footer__socials a:hover {
  color: var(--clr-accent-light);
}

/* ═══════════════════════════════════════════════
   LIGHTBOX
   ═══════════════════════════════════════════════ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

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

.lightbox__img-wrapper {
  max-width: 90vw;
  max-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox__img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  transition: transform 0.3s ease;
}

.lightbox.open .lightbox__img {
  transform: scale(1);
}

.lightbox__close {
  position: absolute;
  top: var(--space-xl);
  right: var(--space-xl);
  font-size: 2.5rem;
  color: var(--clr-text);
  z-index: 2001;
  transition: color var(--transition);
  line-height: 1;
}

.lightbox__close:hover {
  color: var(--clr-accent-light);
}

.lightbox__prev,
.lightbox__next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 3rem;
  color: var(--clr-text);
  z-index: 2001;
  padding: var(--space-md);
  transition: color var(--transition);
  line-height: 1;
}

.lightbox__prev { left: var(--space-xl); }
.lightbox__next { right: var(--space-xl); }

.lightbox__prev:hover,
.lightbox__next:hover {
  color: var(--clr-accent-light);
}

.lightbox__caption {
  margin-top: var(--space-md);
  color: var(--clr-text-dim);
  font-size: var(--fs-sm);
  text-align: center;
}

/* ═══════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .about__photo {
    max-width: 400px;
    order: -1;
  }

  .contact__grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .gallery__masonry {
    column-count: 2;
  }
}

@media (max-width: 768px) {
  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .section-title {
    font-size: var(--fs-2xl);
  }

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

  .gallery__masonry {
    column-count: 2;
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }

  /* Skills marquee fallback to grid on mobile */
  .marquee__track {
    animation: none;
    flex-wrap: wrap;
    width: 100%;
    padding: 0 var(--space-xl);
  }

  .marquee__content[aria-hidden="true"] {
    display: none;
  }

  .marquee__content {
    flex-wrap: wrap;
    justify-content: center;
  }

  .marquee {
    -webkit-mask-image: none;
    mask-image: none;
  }

  .lightbox__prev,
  .lightbox__next {
    font-size: 2rem;
  }

  .lightbox__prev { left: var(--space-sm); }
  .lightbox__next { right: var(--space-sm); }
}

@media (max-width: 480px) {
  :root {
    --space-xl: 1.25rem;
  }

  .gallery__masonry {
    column-count: 1;
  }

  .hero__name {
    font-size: clamp(3rem, 15vw, 5rem);
  }

  .hero__scroll-hint {
    display: none;
  }
}