/* ========================================
   LONGFUNK Portfolio — Minimal Style
   ======================================== */

/* Self-hosted font — avoids Google Fonts being blocked in China */
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url('../fonts/SpaceGrotesk-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  --bg: #c8c4bf;
  --bg-dark: #6b6864;
  --text: #1a1a1a;
  --text-light: #888;
  --white: #f5f3f0;
  --accent: #1a1a1a;
  --font: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --duration: 0.4s;
  --easing: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

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

/* ========== Navigation ========== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 2.5rem;
  transition: var(--transition);
  mix-blend-mode: difference;
}

.nav.scrolled {
  mix-blend-mode: normal;
  background: rgba(200, 196, 191, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 0.8rem 2.5rem;
}

.nav-logo {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-decoration: none;
  color: var(--white);
  transition: var(--transition);
}

.nav.scrolled .nav-logo {
  color: var(--text);
}

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

.nav-link {
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--white);
  transition: var(--transition);
  position: relative;
}

.nav.scrolled .nav-link {
  color: var(--text);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width 0.3s ease;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--white);
  transition: var(--transition);
}

.nav.scrolled .nav-toggle span {
  background: var(--text);
}

/* ========== Progress Bar ========== */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--text);
  z-index: 101;
  transition: width 0.1s linear;
}

/* ========== Hero ========== */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  position: relative;
}

.hero-content {
  text-align: center;
}

.hero-logo {
  font-size: 4rem;
  font-weight: 300;
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 1s 0.3s forwards;
}

.hero-title {
  font-size: clamp(3rem, 10vw, 8rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 0.9;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 1s 0.5s forwards;
}

.hero-subtitle {
  font-size: clamp(1.5rem, 4vw, 3rem);
  font-weight: 300;
  letter-spacing: 0.05em;
  margin-top: 0.3rem;
  font-style: italic;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 1s 0.7s forwards;
}

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  margin-top: 2rem;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--text-light);
  opacity: 0;
  animation: fadeUp 1s 0.9s forwards;
}

.dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-light);
}

.scroll-hint {
  position: absolute;
  bottom: 3rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  opacity: 0;
  animation: fadeUp 1s 1.2s forwards;
}

.scroll-hint span {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-light);
}

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

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

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

/* ========== Category Section ========== */
.category-section {
  padding: 0;
}

.category-header {
  height: 50vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-dark);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.category-number {
  font-size: 8rem;
  font-weight: 200;
  line-height: 1;
  opacity: 0.15;
  position: absolute;
}

.category-title {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 600;
  letter-spacing: 0.05em;
  z-index: 1;
}

.category-subtitle {
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-top: 0.5rem;
  opacity: 0.6;
  z-index: 1;
}

/* ========== Gallery Slides ========== */
.slide {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.slide-img-wrapper {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.slide-img {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.8s ease, transform 1s var(--easing);
}

.slide-img.visible {
  opacity: 1;
  transform: scale(1);
}

.slide-img:hover {
  transform: scale(1.02);
}

/* Alternate background colors */
.slide:nth-child(even) {
  background: #bfbbb6;
}

.slide:nth-child(odd) {
  background: var(--bg);
}

/* ========== Contact ========== */
.contact {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--text);
  color: var(--white);
}

.contact-content {
  text-align: center;
}

.contact-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 600;
  letter-spacing: 0.03em;
}

.contact-subtitle {
  font-size: 0.9rem;
  margin-top: 1rem;
  opacity: 0.5;
}

.contact-email {
  display: inline-block;
  margin-top: 2.5rem;
  font-size: 1.2rem;
  color: var(--white);
  text-decoration: none;
  letter-spacing: 0.05em;
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(245, 243, 240, 0.3);
  transition: var(--transition);
}

.contact-email:hover {
  border-bottom-color: var(--white);
}

.contact-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  margin-top: 3rem;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  opacity: 0.3;
}

.contact-footer .dot {
  background: rgba(245, 243, 240, 0.3);
}

/* ========== Image Viewer ========== */
.viewer {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.viewer.active {
  opacity: 1;
  pointer-events: all;
}

.viewer-img {
  max-width: 92vw;
  max-height: 90vh;
  object-fit: contain;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.viewer-close {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  font-size: 2rem;
  color: white;
  background: none;
  border: none;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity 0.3s;
  z-index: 10;
}

.viewer-close:hover {
  opacity: 1;
}

.viewer-nav {
  position: absolute;
  bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.viewer-prev,
.viewer-next {
  font-size: 1.5rem;
  color: white;
  background: none;
  border: none;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity 0.3s;
  padding: 0.5rem 1rem;
}

.viewer-prev:hover,
.viewer-next:hover {
  opacity: 1;
}

.viewer-counter {
  color: white;
  font-size: 0.8rem;
  opacity: 0.5;
  letter-spacing: 0.1em;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .nav {
    padding: 1rem 1.5rem;
  }

  .nav.scrolled {
    padding: 0.6rem 1.5rem;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    background: rgba(200, 196, 191, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    transform: translateX(100%);
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links .nav-link {
    color: var(--text);
    font-size: 1rem;
  }

  .nav-toggle {
    display: flex;
    z-index: 101;
  }

  .nav-toggle.active span:first-child {
    transform: rotate(45deg) translate(3px, 3px);
  }

  .nav-toggle.active span:last-child {
    transform: rotate(-45deg) translate(3px, -3px);
  }

  .slide {
    padding: 1rem;
  }

  .slide-img {
    max-height: 85vh;
  }

  .category-header {
    height: 40vh;
  }

  .hero-logo {
    font-size: 3rem;
  }
}

/* ========== Scroll Reveal ========== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ========== Loading ========== */
.loading {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease;
}

.loading.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-text {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  animation: pulse 1.5s infinite;
}

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