/* ===== ZEROTH.CH Design System ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Playfair+Display:ital,wght@0,400;0,700;1,400&display=swap');

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

:root {
  --black: #0a0a0a; --white: #fafafa; --gray-100: #f0f0f0; --gray-200: #e0e0e0;
  --gray-300: #c0c0c0; --gray-500: #888; --gray-700: #333; --gray-800: #1a1a1a;
  --font-body: 'Inter', sans-serif; --font-heading: 'Playfair Display', serif;
  --max-width: 1400px; --nav-height: 80px;
  --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-body); background: var(--white); color: var(--black); line-height: 1.7; overflow-x: hidden; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
ul { list-style: none; }

/* ===== LOADING OVERLAY ===== */
.loader { position: fixed; inset: 0; background: var(--black); z-index: 9999; display: flex; align-items: center; justify-content: center; transition: opacity 0.8s ease, visibility 0.8s ease; }
.loader.hidden { opacity: 0; visibility: hidden; }
.loader-text { font-family: var(--font-body); font-size: clamp(1.2rem, 3vw, 2rem); font-weight: 300; color: var(--white); letter-spacing: 0.5em; text-transform: uppercase; animation: loaderPulse 1.5s ease-in-out infinite; }
@keyframes loaderPulse { 0%, 100% { opacity: 0.3; } 50% { opacity: 1; } }

/* ===== NAVBAR ===== */
.navbar { position: fixed; top: 0; left: 0; right: 0; height: var(--nav-height); z-index: 1000; display: flex; align-items: center; justify-content: space-between; padding: 0 clamp(1.5rem, 4vw, 4rem); transition: background 0.4s ease, border-color 0.4s ease; border-bottom: 1px solid transparent; }
.navbar.scrolled { background: rgba(10,10,10,0.95); backdrop-filter: blur(20px); border-bottom-color: rgba(255,255,255,0.08); }
.nav-logo { font-family: var(--font-body); font-size: 1.1rem; font-weight: 500; letter-spacing: 0.35em; text-transform: uppercase; color: var(--white); }
.nav-links { display: flex; gap: 2.5rem; }
.nav-links a { font-size: 0.75rem; font-weight: 400; letter-spacing: 0.2em; text-transform: uppercase; color: rgba(255,255,255,0.7); transition: color var(--transition); position: relative; }
.nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 1px; background: var(--white); transition: width var(--transition); }
.nav-links a:hover { color: var(--white); }
.nav-links a:hover::after { width: 100%; }
.hamburger { display: none; flex-direction: column; gap: 6px; width: 28px; cursor: pointer; z-index: 1001; }
.hamburger span { display: block; height: 1px; background: var(--white); transition: var(--transition); }
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
.mobile-menu { position: fixed; inset: 0; background: var(--black); z-index: 999; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2rem; opacity: 0; visibility: hidden; transition: var(--transition); }
.mobile-menu.active { opacity: 1; visibility: visible; }
.mobile-menu a { font-size: 1.5rem; font-weight: 300; letter-spacing: 0.3em; text-transform: uppercase; color: var(--white); }

/* ===== HERO ===== */
.hero { position: relative; height: 100vh; min-height: 600px; display: flex; align-items: center; justify-content: center; text-align: center; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; background: url('assets/portfolio/E1.jpg') center/cover no-repeat; transition: transform 0.1s linear; }
.hero-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.55); }
.hero-content { position: relative; z-index: 2; color: var(--white); padding: 0 2rem; }
.hero-title { font-family: var(--font-body); font-size: clamp(3rem, 8vw, 7rem); font-weight: 300; letter-spacing: 0.4em; text-transform: uppercase; line-height: 1.1; margin-bottom: 1rem; }
.hero-subtitle { font-family: var(--font-body); font-size: clamp(0.8rem, 1.5vw, 1rem); font-weight: 300; letter-spacing: 0.5em; text-transform: uppercase; color: rgba(255,255,255,0.7); margin-bottom: 0.8rem; }
.hero-credit { font-family: var(--font-body); font-size: 0.7rem; font-weight: 300; letter-spacing: 0.3em; color: rgba(255,255,255,0.5); margin-bottom: 3rem; }
.hero-cta { display: inline-block; padding: 1rem 3rem; border: 1px solid rgba(255,255,255,0.5); color: var(--white); font-size: 0.7rem; font-weight: 400; letter-spacing: 0.35em; text-transform: uppercase; transition: var(--transition); }
.hero-cta:hover { background: var(--white); color: var(--black); }
.scroll-indicator { position: absolute; bottom: 2.5rem; left: 50%; transform: translateX(-50%); z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.scroll-indicator span { font-size: 0.6rem; letter-spacing: 0.3em; text-transform: uppercase; color: rgba(255,255,255,0.5); }
.scroll-line { width: 1px; height: 40px; background: linear-gradient(to bottom, rgba(255,255,255,0.5), transparent); animation: scrollPulse 2s ease-in-out infinite; }
@keyframes scrollPulse { 0%, 100% { opacity: 0.3; transform: scaleY(0.5); } 50% { opacity: 1; transform: scaleY(1); } }

/* ===== SECTIONS ===== */
.section { padding: clamp(5rem, 10vw, 10rem) clamp(1.5rem, 4vw, 4rem); }
.section-dark { background: var(--black); color: var(--white); }
.section-header { text-align: center; margin-bottom: clamp(3rem, 6vw, 6rem); }
.section-label { font-size: 0.7rem; font-weight: 400; letter-spacing: 0.4em; text-transform: uppercase; color: var(--gray-500); margin-bottom: 1.5rem; display: block; }
.section-title { font-family: var(--font-heading); font-size: clamp(2rem, 4vw, 3.5rem); font-weight: 400; line-height: 1.2; }
.section-line { width: 60px; height: 1px; background: var(--gray-300); margin: 2rem auto 0; }
.section-dark .section-line { background: var(--gray-700); }
.container { max-width: var(--max-width); margin: 0 auto; }

/* ===== ABOUT ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(3rem, 6vw, 8rem); align-items: start; }
.about-image { position: relative; overflow: hidden; aspect-ratio: 3/4; }
.about-image img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(100%); transition: filter 0.6s ease; }
.about-image:hover img { filter: grayscale(0%); }
.about-image-caption { position: absolute; bottom: 0; left: 0; right: 0; padding: 1.5rem; background: linear-gradient(transparent, rgba(0,0,0,0.7)); }
.about-image-caption span { font-size: 0.7rem; letter-spacing: 0.3em; text-transform: uppercase; color: rgba(255,255,255,0.8); }
.about-content { padding-top: 2rem; }
.about-quote { font-family: var(--font-heading); font-size: clamp(1.5rem, 2.5vw, 2.2rem); font-weight: 400; font-style: italic; line-height: 1.5; margin-bottom: 3rem; color: var(--gray-700); }
.about-text { margin-bottom: 2rem; }
.about-text h3 { font-family: var(--font-body); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.3em; text-transform: uppercase; margin-bottom: 1rem; color: var(--gray-500); }
.about-text p { font-size: 0.95rem; font-weight: 300; line-height: 1.8; color: var(--gray-700); }
.about-divider { width: 100%; height: 1px; background: var(--gray-200); margin: 2rem 0; }
.about-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; margin-top: 3rem; padding-top: 3rem; border-top: 1px solid var(--gray-200); }
.stat-number { font-family: var(--font-heading); font-size: clamp(2.5rem, 4vw, 3.5rem); font-weight: 400; line-height: 1; }
.stat-label { font-size: 0.65rem; font-weight: 400; letter-spacing: 0.3em; text-transform: uppercase; color: var(--gray-500); margin-top: 0.5rem; }

/* ===== PROJECTS ===== */
.filter-bar { display: flex; justify-content: center; flex-wrap: wrap; gap: 1rem; margin-bottom: clamp(3rem, 5vw, 5rem); }
.filter-btn { padding: 0.6rem 1.5rem; font-size: 0.7rem; font-weight: 400; letter-spacing: 0.25em; text-transform: uppercase; color: var(--gray-500); border: 1px solid transparent; transition: var(--transition); cursor: pointer; }
.filter-btn.active, .filter-btn:hover { color: var(--white); border-color: var(--white); }
.projects-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; max-width: var(--max-width); margin: 0 auto; }
.project-card { position: relative; overflow: hidden; cursor: pointer; aspect-ratio: 4/5; }
.project-card.wide { grid-column: span 2; aspect-ratio: 8/5; }
.project-card.tall { grid-row: span 2; aspect-ratio: auto; }
.project-card img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.8s ease, filter 0.6s ease; filter: grayscale(30%); }
.project-card:hover img { transform: scale(1.05); filter: grayscale(100%); }
.project-overlay { position: absolute; inset: 0; background: linear-gradient(transparent 40%, rgba(0,0,0,0.8)); display: flex; flex-direction: column; justify-content: flex-end; padding: 2rem; opacity: 0; transition: opacity var(--transition); }
.project-card:hover .project-overlay { opacity: 1; }
.project-overlay h3 { font-family: var(--font-heading); font-size: 1.5rem; font-weight: 400; color: var(--white); margin-bottom: 0.3rem; }
.project-overlay .project-meta { font-size: 0.7rem; letter-spacing: 0.2em; text-transform: uppercase; color: rgba(255,255,255,0.6); }

/* ===== PROJECT MODAL ===== */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.95); z-index: 2000; opacity: 0; visibility: hidden; transition: var(--transition); overflow-y: auto; }
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal-close { position: fixed; top: 2rem; right: 2rem; z-index: 2001; width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; cursor: pointer; }
.modal-close::before, .modal-close::after { content: ''; position: absolute; width: 24px; height: 1px; background: var(--white); }
.modal-close::before { transform: rotate(45deg); }
.modal-close::after { transform: rotate(-45deg); }
.modal-content { max-width: 1000px; margin: 0 auto; padding: 6rem 2rem; color: var(--white); }
.modal-hero-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; margin-bottom: 3rem; }
.modal-title { font-family: var(--font-heading); font-size: clamp(2rem, 4vw, 3.5rem); font-weight: 400; margin-bottom: 1rem; }
.modal-details { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; margin-bottom: 3rem; padding: 2rem 0; border-top: 1px solid rgba(255,255,255,0.15); border-bottom: 1px solid rgba(255,255,255,0.15); }
.modal-detail-label { font-size: 0.65rem; letter-spacing: 0.3em; text-transform: uppercase; color: rgba(255,255,255,0.5); margin-bottom: 0.3rem; }
.modal-detail-value { font-size: 0.95rem; font-weight: 300; }
.modal-description { font-size: 1rem; font-weight: 300; line-height: 2; color: rgba(255,255,255,0.8); margin-bottom: 3rem; max-width: 700px; }
.modal-gallery { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 2rem; }
.modal-gallery img { width: 100%; aspect-ratio: 3/2; object-fit: cover; }
.modal-section-title { font-size: 0.7rem; font-weight: 500; letter-spacing: 0.3em; text-transform: uppercase; color: rgba(255,255,255,0.5); margin: 3rem 0 1.5rem; }

/* ===== SERVICES ===== */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1px; max-width: var(--max-width); margin: 0 auto; background: var(--gray-200); }
.service-card { background: var(--white); padding: clamp(2rem, 4vw, 3.5rem); transition: var(--transition); position: relative; }
.service-card:hover { background: var(--black); color: var(--white); }
.service-number { font-size: 0.65rem; font-weight: 400; letter-spacing: 0.2em; color: var(--gray-300); margin-bottom: 2rem; display: block; transition: color var(--transition); }
.service-card:hover .service-number { color: var(--gray-700); }
.service-icon { width: 32px; height: 32px; margin-bottom: 1.5rem; stroke: var(--black); fill: none; stroke-width: 1; transition: stroke var(--transition); }
.service-card:hover .service-icon { stroke: var(--white); }
.service-card h3 { font-family: var(--font-heading); font-size: 1.3rem; font-weight: 400; margin-bottom: 1rem; }
.service-card p { font-size: 0.85rem; font-weight: 300; line-height: 1.8; color: var(--gray-500); transition: color var(--transition); }
.service-card:hover p { color: rgba(255,255,255,0.6); }

/* ===== PROCESS ===== */
.process-timeline { max-width: 800px; margin: 0 auto; position: relative; }
.process-timeline::before { content: ''; position: absolute; left: 50%; top: 0; bottom: 0; width: 1px; background: var(--gray-200); transform: translateX(-50%); }
.process-step { display: flex; align-items: flex-start; margin-bottom: 4rem; position: relative; }
.process-step:nth-child(odd) { flex-direction: row; }
.process-step:nth-child(even) { flex-direction: row-reverse; }
.process-step-content { width: 45%; padding: 2rem; }
.process-step:nth-child(odd) .process-step-content { text-align: right; padding-right: 3rem; }
.process-step:nth-child(even) .process-step-content { text-align: left; padding-left: 3rem; }
.process-dot { position: absolute; left: 50%; top: 2rem; width: 12px; height: 12px; border: 1px solid var(--gray-300); border-radius: 50%; background: var(--white); transform: translateX(-50%); z-index: 1; transition: var(--transition); }
.process-step:hover .process-dot { background: var(--black); border-color: var(--black); }
.process-number { font-family: var(--font-heading); font-size: 2.5rem; font-weight: 400; color: var(--gray-200); line-height: 1; margin-bottom: 0.5rem; }
.process-step-content h3 { font-family: var(--font-body); font-size: 0.8rem; font-weight: 500; letter-spacing: 0.3em; text-transform: uppercase; margin-bottom: 0.8rem; }
.process-step-content p { font-size: 0.85rem; font-weight: 300; line-height: 1.8; color: var(--gray-500); }

/* ===== TESTIMONIALS ===== */
.testimonials-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2rem; max-width: var(--max-width); margin: 0 auto; }
.testimonial-card { padding: clamp(2rem, 4vw, 3rem); border: 1px solid var(--gray-200); transition: var(--transition); }
.testimonial-card:hover { border-color: var(--black); }
.testimonial-quote-mark { font-family: var(--font-heading); font-size: 4rem; line-height: 1; color: var(--gray-200); margin-bottom: 1rem; }
.testimonial-card blockquote { font-family: var(--font-heading); font-size: 1.05rem; font-weight: 400; font-style: italic; line-height: 1.8; color: var(--gray-700); margin-bottom: 2rem; }
.testimonial-author { font-size: 0.75rem; font-weight: 500; letter-spacing: 0.2em; text-transform: uppercase; }
.testimonial-project { font-size: 0.7rem; font-weight: 300; letter-spacing: 0.15em; color: var(--gray-500); margin-top: 0.3rem; }

/* ===== CONTACT ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(3rem, 6vw, 8rem); max-width: var(--max-width); margin: 0 auto; }
.contact-form { display: flex; flex-direction: column; gap: 1.5rem; }
.form-group { position: relative; }
.form-group input, .form-group textarea { width: 100%; padding: 1rem 0; font-family: var(--font-body); font-size: 0.9rem; font-weight: 300; color: var(--white); background: transparent; border: none; border-bottom: 1px solid rgba(255,255,255,0.2); outline: none; transition: border-color var(--transition); resize: none; }
.form-group input::placeholder, .form-group textarea::placeholder { color: rgba(255,255,255,0.4); font-weight: 300; letter-spacing: 0.05em; }
.form-group input:focus, .form-group textarea:focus { border-bottom-color: var(--white); }
.form-group textarea { min-height: 120px; }
.submit-btn { align-self: flex-start; padding: 1rem 3rem; border: 1px solid rgba(255,255,255,0.5); color: var(--white); font-size: 0.7rem; font-weight: 400; letter-spacing: 0.35em; text-transform: uppercase; transition: var(--transition); cursor: pointer; background: transparent; }
.submit-btn:hover { background: var(--white); color: var(--black); }
.contact-info h3 { font-family: var(--font-body); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.3em; text-transform: uppercase; color: rgba(255,255,255,0.5); margin-bottom: 1rem; margin-top: 2.5rem; }
.contact-info h3:first-child { margin-top: 0; }
.contact-info p, .contact-info a { font-size: 0.95rem; font-weight: 300; line-height: 1.8; color: rgba(255,255,255,0.8); display: block; }
.contact-info a:hover { color: var(--white); }
.social-links { display: flex; gap: 1.5rem; margin-top: 0.5rem; }
.social-links a { font-size: 0.75rem; font-weight: 400; letter-spacing: 0.2em; text-transform: uppercase; color: rgba(255,255,255,0.5); transition: color var(--transition); }
.social-links a:hover { color: var(--white); }
.contact-map { width: 100%; height: 200px; margin-top: 2.5rem; border: 1px solid rgba(255,255,255,0.1); filter: grayscale(100%) invert(100%) contrast(1.2); }
.form-success { display: none; padding: 1rem; border: 1px solid rgba(255,255,255,0.3); text-align: center; font-size: 0.8rem; letter-spacing: 0.2em; text-transform: uppercase; color: rgba(255,255,255,0.8); }

/* ===== FOOTER ===== */
.footer { padding: 3rem clamp(1.5rem, 4vw, 4rem); border-top: 1px solid rgba(255,255,255,0.08); display: flex; justify-content: space-between; align-items: center; background: var(--black); color: rgba(255,255,255,0.4); font-size: 0.7rem; letter-spacing: 0.15em; }
.footer a { color: rgba(255,255,255,0.4); transition: color var(--transition); }
.footer a:hover { color: var(--white); }

/* ===== SCROLL REVEAL ===== */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .project-card.wide { grid-column: span 1; aspect-ratio: 4/5; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .about-image { max-height: 500px; }
  .projects-grid { grid-template-columns: 1fr; }
  .project-card.wide, .project-card.tall { grid-column: span 1; grid-row: span 1; aspect-ratio: 4/5; }
  .modal-details { grid-template-columns: 1fr; gap: 1rem; }
  .modal-gallery { grid-template-columns: 1fr; }
  .process-timeline::before { left: 1rem; }
  .process-step, .process-step:nth-child(even) { flex-direction: column; padding-left: 3rem; }
  .process-step-content { width: 100% !important; text-align: left !important; padding: 0 !important; }
  .process-dot { left: 1rem; }
  .about-stats { grid-template-columns: repeat(3, 1fr); }
  .footer { flex-direction: column; gap: 1rem; text-align: center; }
  .services-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .hero-title { letter-spacing: 0.2em; }
  .filter-bar { gap: 0.5rem; }
  .filter-btn { padding: 0.4rem 0.8rem; font-size: 0.6rem; }
  .testimonials-grid { grid-template-columns: 1fr; }
}