/* ============================================
   CSS Custom Properties
   ============================================ */
:root {
  --color-bg: #0e0e1a;
  --color-surface: #16162a;
  --color-surface-hover: #1e1e38;
  --color-text: #eee;
  --color-text-muted: #aab;
  --color-pink: #ff6b9d;
  --color-blue: #5e9eff;
  --color-green: #4ecdc4;
  --color-orange: #ff9f43;
  --color-purple: #a55eea;
  --color-yellow: #ffd93d;
  --gradient-primary: linear-gradient(135deg, var(--color-pink), var(--color-purple), var(--color-blue));
  --gradient-hero: linear-gradient(135deg, #667eea, #764ba2, #f093fb, #f5576c, #4facfe, #667eea);
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-height: 64px;
}

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

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

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

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

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

/* ============================================
   Utilities
   ============================================ */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 100px 0;
}

.section__title {
  font-size: clamp(2rem, 5vw, 3rem);
  text-align: center;
  margin-bottom: 48px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border: none;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  text-align: center;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(255, 107, 157, 0.35);
}

.btn--primary:hover {
  box-shadow: 0 6px 30px rgba(255, 107, 157, 0.5);
}

.btn--outline {
  background: transparent;
  border: 1.5px solid var(--color-text-muted);
  color: var(--color-text);
  padding: 6px 16px;
  font-size: 0.85rem;
}

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

.btn--small {
  padding: 6px 16px;
  font-size: 0.85rem;
}

.btn--full {
  width: 100%;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 100;
  background: rgba(14, 14, 26, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: box-shadow var(--transition);
}

.nav--scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

.nav__logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav__links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav__link {
  font-weight: 500;
  position: relative;
  transition: color var(--transition);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
  transition: width var(--transition);
}

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

.nav__link.active {
  color: var(--color-pink);
}

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

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  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);
}

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

.hero__bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  background-size: 400% 400%;
  animation: gradientShift 12s ease infinite;
  opacity: 0.3;
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, transparent 0%, var(--color-bg) 70%);
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  25% { background-position: 100% 0%; }
  50% { background-position: 100% 100%; }
  75% { background-position: 0% 100%; }
}

.hero__content {
  position: relative;
  z-index: 1;
  padding: 0 20px;
}

.hero__title {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero__name {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__tagline {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--color-text-muted);
  margin-bottom: 32px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

.hero__cta {
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero__scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  z-index: 1;
}

.hero__scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--color-text-muted);
  border-bottom: 2px solid var(--color-text-muted);
  transform: rotate(45deg);
  animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translateY(0); opacity: 1; }
  50% { transform: rotate(45deg) translateY(8px); opacity: 0.4; }
}

/* ============================================
   About
   ============================================ */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about__text p {
  color: var(--color-text-muted);
  margin-bottom: 16px;
  font-size: 1.05rem;
}

.about__skills h3 {
  margin-bottom: 16px;
  font-size: 1.2rem;
}

/* Tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tags--small {
  gap: 6px;
  margin-top: 12px;
}

.tag {
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: transform var(--transition);
}

.tags--small .tag {
  padding: 3px 10px;
  font-size: 0.75rem;
}

.tag:hover {
  transform: scale(1.08);
}

.tag--pink   { background: rgba(255, 107, 157, 0.15); color: var(--color-pink); }
.tag--blue   { background: rgba(94, 158, 255, 0.15);  color: var(--color-blue); }
.tag--green  { background: rgba(78, 205, 196, 0.15);  color: var(--color-green); }
.tag--orange { background: rgba(255, 159, 67, 0.15);  color: var(--color-orange); }
.tag--purple { background: rgba(165, 94, 234, 0.15);  color: var(--color-purple); }
.tag--yellow { background: rgba(255, 217, 61, 0.15);  color: var(--color-yellow); }

/* ============================================
   Projects
   ============================================ */
.projects {
  background: var(--color-surface);
}

.projects__filter {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 24px;
  border: 1.5px solid var(--color-text-muted);
  border-radius: 50px;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover {
  border-color: var(--color-pink);
  color: var(--color-pink);
}

.filter-btn.active {
  background: var(--gradient-primary);
  border-color: transparent;
  color: #fff;
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

/* Cards */
.card {
  background: var(--color-bg);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.card.hidden {
  display: none;
}

.card__image {
  height: 180px;
  overflow: hidden;
}

.card__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.9);
  transition: transform var(--transition);
}

.card:hover .card__placeholder {
  transform: scale(1.05);
}

.card__placeholder--1 { background: linear-gradient(135deg, #ff6b9d, #c44569); }
.card__placeholder--2 { background: linear-gradient(135deg, #5e9eff, #3d5af1); }
.card__placeholder--3 { background: linear-gradient(135deg, #4ecdc4, #2d98da); }
.card__placeholder--4 { background: linear-gradient(135deg, #a55eea, #8854d0); }
.card__placeholder--5 { background: linear-gradient(135deg, #ff9f43, #ee5a24); }
.card__placeholder--6 { background: linear-gradient(135deg, #ffd93d, #f7b731); }

.card__body {
  padding: 20px;
}

.card__title {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.card__desc {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 4px;
}

.card__links {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

/* ============================================
   Contact
   ============================================ */
.contact__grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: start;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-pink);
  box-shadow: 0 0 0 3px rgba(255, 107, 157, 0.15);
}

.form-group input.error,
.form-group textarea.error {
  border-color: #ff4757;
}

.form-error {
  display: block;
  color: #ff4757;
  font-size: 0.8rem;
  margin-top: 4px;
  min-height: 1.2em;
}

.form-success {
  display: none;
  color: var(--color-green);
  font-weight: 600;
  text-align: center;
  margin-top: 16px;
}

.form-success.visible {
  display: block;
  animation: fadeUp 0.4s ease;
}

.contact__info {
  padding-top: 8px;
}

.contact__info p {
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.socials {
  display: flex;
  gap: 16px;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.social-link:hover {
  background: var(--gradient-primary);
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 4px 16px rgba(255, 107, 157, 0.3);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 24px 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* ============================================
   Reveal Animations
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(14, 14, 26, 0.97);
    backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
  }

  .nav__links.open {
    max-height: 300px;
    padding: 16px 0;
  }

  .nav__links li {
    padding: 12px 0;
  }

  .nav__toggle {
    display: flex;
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .contact__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .section {
    padding: 72px 0;
  }
}

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

  .projects__filter {
    gap: 8px;
  }

  .filter-btn {
    padding: 6px 16px;
    font-size: 0.8rem;
  }
}