/* ════════════════════════════════════════════════════════
   JOSTIN RENDÓN — Portfolio
   style.css · Dark Mode · Syne + DM Sans
   Mobile-First, CSS Grid, Custom Properties
════════════════════════════════════════════════════════ */

/* ── CUSTOM PROPERTIES ──────────────────────────────── */
:root {
  /* Colors */
  --bg:          #0A0A0A;
  --bg-2:        #111111;
  --bg-3:        #171717;
  --surface:     #1C1C1E;
  --border:      rgba(255,255,255,0.07);
  --border-hov:  rgba(255,255,255,0.15);

  --white:       #FAFAF8;
  --gray-1:      #E8E8E6;
  --gray-2:      #A8A8A4;
  --gray-3:      #606060;
  --gray-4:      #2A2A2A;

  /* Accent — Electric Blue */
  --accent:      #007AFF;
  --accent-dim:  rgba(0,122,255,0.12);
  --accent-glow: rgba(0,122,255,0.25);

  /* Typography */
  --font-head:   'Syne', sans-serif;
  --font-body:   'DM Sans', sans-serif;

  /* Spacing scale */
  --space-xs:    0.5rem;
  --space-sm:    1rem;
  --space-md:    2rem;
  --space-lg:    4rem;
  --space-xl:    8rem;

  /* Layout */
  --max-w:       1280px;
  --nav-h:       72px;
  --radius:      8px;
  --radius-lg:   16px;

  /* Transitions */
  --ease:        cubic-bezier(0.4, 0, 0.2, 1);
  --t-fast:      0.2s;
  --t-med:       0.4s;
  --t-slow:      0.7s;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--white);
  overflow-x: hidden;
  line-height: 1.6;
  cursor: none; /* Custom cursor active */
}

@media (hover: none) {
  body { cursor: auto; }
}

img    { display: block; max-width: 100%; }
a      { color: inherit; text-decoration: none; }
button { cursor: none; font-family: var(--font-body); border: none; background: none; }
ul     { list-style: none; }

/* ── CUSTOM CURSOR ──────────────────────────────────── */
.cursor {
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  position: fixed; top: 0; left: 0;
  z-index: 9999; pointer-events: none;
  transform: translate(-50%, -50%);
  transition: transform 0.1s, width 0.25s, height 0.25s, background 0.25s;
}

.cursor-follower {
  width: 36px; height: 36px;
  border: 1px solid rgba(0,122,255,0.5);
  border-radius: 50%;
  position: fixed; top: 0; left: 0;
  z-index: 9998; pointer-events: none;
  transform: translate(-50%, -50%);
  transition: transform 0.12s var(--ease), width 0.3s, height 0.3s, border-color 0.3s;
}

body.cursor-hover .cursor          { width: 16px; height: 16px; background: var(--white); }
body.cursor-hover .cursor-follower { width: 56px; height: 56px; border-color: var(--accent); }

@media (hover: none) {
  .cursor, .cursor-follower { display: none; }
}

/* ── PAGE LOADER ────────────────────────────────────── */
.loader {
  position: fixed; inset: 0;
  z-index: 10000;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  transition: opacity 0.5s var(--ease), visibility 0.5s;
}

.loader.done {
  opacity: 0; visibility: hidden; pointer-events: none;
}

.loader-inner {
  display: flex; flex-direction: column;
  align-items: center; gap: 1.5rem;
}

.loader-text {
  font-family: var(--font-head);
  font-size: 3rem; font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--white);
}

.loader-bar {
  width: 200px; height: 1px;
  background: var(--gray-4);
  overflow: hidden;
}

.loader-fill {
  height: 100%; width: 0;
  background: var(--accent);
  animation: loadFill 1.8s var(--ease) forwards;
}

@keyframes loadFill {
  from { width: 0; }
  to   { width: 100%; }
}

/* ── UTILITIES ──────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: var(--space-xl) 0;
}

.sec-tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.sec-title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.sec-title em {
  font-style: normal;
  color: var(--accent);
}

.sec-sub {
  margin-top: 1rem;
  font-size: 1rem;
  color: var(--gray-2);
  font-weight: 300;
}

.section-head {
  margin-bottom: 4rem;
}

/* ── BUTTONS ────────────────────────────────────────── */
.btn-primary {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--accent);
  color: var(--white);
  padding: 0.85rem 2rem;
  font-family: var(--font-body);
  font-size: 0.85rem; font-weight: 500;
  letter-spacing: 0.05em;
  border-radius: var(--radius);
  transition: transform var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease),
              background var(--t-fast);
  white-space: nowrap;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-ghost {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: transparent;
  color: var(--white);
  padding: 0.85rem 2rem;
  font-size: 0.85rem; font-weight: 500;
  letter-spacing: 0.05em;
  border: 1px solid var(--border-hov);
  border-radius: var(--radius);
  transition: border-color var(--t-fast), transform var(--t-fast) var(--ease);
}

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

/* ── SCROLL REVEAL ──────────────────────────────────── */
/*
 * Elements start invisible and transform to visible when
 * the IntersectionObserver in script.js adds .visible class.
 * --delay custom property allows stagger per element.
 */
.reveal-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity var(--t-slow) var(--ease) var(--delay, 0s),
              transform var(--t-slow) var(--ease) var(--delay, 0s);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity var(--t-slow) var(--ease),
              transform var(--t-slow) var(--ease);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity var(--t-slow) var(--ease),
              transform var(--t-slow) var(--ease);
}

.reveal-up.visible,
.reveal-left.visible,
.reveal-right.visible {
  opacity: 1;
  transform: none;
}

/* ── NAVBAR ─────────────────────────────────────────── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 500;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--t-med) var(--ease),
              border-color var(--t-med) var(--ease),
              backdrop-filter var(--t-med);
}

.navbar.scrolled {
  background: rgba(10,10,10,0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-color: var(--border);
}

.nav-logo {
  font-family: var(--font-head);
  font-size: 1.2rem; font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--white);
  transition: color var(--t-fast);
}

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

.logo-bracket { color: var(--accent); }

.nav-links {
  display: flex; align-items: center; gap: 2.5rem;
}

.nav-link {
  font-size: 0.82rem; font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--gray-2);
  position: relative;
  transition: color var(--t-fast);
}

.nav-link::after {
  content: '';
  position: absolute; bottom: -3px; left: 0; right: 0;
  height: 1px; background: var(--accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--t-fast) var(--ease);
}

.nav-link:hover { color: var(--white); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-actions {
  display: flex; align-items: center; gap: 1rem;
}

/* Language toggle */
.lang-toggle, .mobile-lang {
  display: flex; align-items: center; gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  cursor: none;
  transition: border-color var(--t-fast);
}

.lang-toggle:hover { border-color: var(--border-hov); }

.lang-opt {
  font-size: 0.68rem; font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--gray-3);
  transition: color var(--t-fast);
  cursor: none;
}

.lang-opt.active { color: var(--white); }

.lang-sep { font-size: 0.65rem; color: var(--gray-4); }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column; gap: 5px;
  width: 36px; height: 36px;
  align-items: center; justify-content: center;
  cursor: none;
}

.hamburger span {
  display: block; width: 20px; height: 1px;
  background: var(--white);
  transition: all var(--t-fast) var(--ease);
}

.hamburger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Mobile overlay */
.mobile-overlay {
  position: fixed; inset: 0;
  z-index: 400;
  background: var(--bg);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 3rem;
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity var(--t-med) var(--ease), visibility var(--t-med);
}

.mobile-overlay.open {
  opacity: 1; visibility: visible; pointer-events: all;
}

.mobile-nav {
  display: flex; flex-direction: column; align-items: center; gap: 2rem;
}

.mobile-link {
  font-family: var(--font-head);
  font-size: 2.5rem; font-weight: 700;
  color: var(--gray-2);
  letter-spacing: -0.01em;
  transition: color var(--t-fast), transform var(--t-fast);
}

.mobile-link:hover { color: var(--white); transform: translateX(8px); }

/* ── HERO ───────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex; align-items: center;
  position: relative; overflow: hidden;
  padding: calc(var(--nav-h) + 4rem) 0 4rem;
}

/* Floating tech tags — Antigravity animation */
.hero-floats {
  position: absolute; inset: 0;
  pointer-events: none; z-index: 0;
}

.float-tag {
  position: absolute;
  left: var(--dx); top: var(--dy);
  font-size: 0.7rem; font-weight: 500;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--gray-3);
  border: 1px solid var(--border);
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  background: var(--bg-2);
  animation: floatDrift 6s ease-in-out infinite var(--delay, 0s);
  white-space: nowrap;
}

@keyframes floatDrift {
  0%, 100% { transform: translateY(0px) rotate(0deg); opacity: 0.5; }
  33%       { transform: translateY(-12px) rotate(-1deg); opacity: 0.8; }
  66%       { transform: translateY(6px) rotate(1deg); opacity: 0.6; }
}

/* Noise texture */
.hero-noise {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 128px;
}

.hero-content {
  position: relative; z-index: 1;
  padding: 0 1.5rem;
  max-width: var(--max-w);
  margin: 0 auto; width: 100%;
}

.hero-eyebrow {
  display: flex; align-items: center; gap: 0.75rem;
  font-size: 0.72rem; font-weight: 500; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--gray-2);
  margin-bottom: 1.5rem;
}

.eyebrow-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
  50%       { box-shadow: 0 0 0 8px transparent; }
}

.hero-title {
  display: flex; flex-direction: column;
  font-family: var(--font-head);
  font-size: clamp(4rem, 12vw, 9rem);
  font-weight: 800; line-height: 0.9;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.title-line { display: block; }
.title-accent { color: var(--accent); }

.hero-role {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-body);
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 300; color: var(--gray-1);
  margin-bottom: 1.5rem; min-height: 2.2rem;
}

.role-static { color: var(--gray-2); }
.role-typing { color: var(--white); font-weight: 500; }

.typing-cursor {
  color: var(--accent); font-weight: 300;
  animation: blink 1s infinite;
}

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

.hero-desc {
  max-width: 540px;
  font-size: 1rem; line-height: 1.8;
  color: var(--gray-2); font-weight: 300;
  margin-bottom: 2.5rem;
}

.hero-ctas {
  display: flex; flex-wrap: wrap; gap: 1rem;
  margin-bottom: 4rem;
}

.hero-stats {
  display: flex; align-items: center; gap: 2rem;
  flex-wrap: wrap;
}

.stat { display: flex; flex-direction: column; }

.stat-num {
  font-family: var(--font-head);
  font-size: 1.8rem; font-weight: 800;
  color: var(--white); line-height: 1;
}

.stat-label {
  font-size: 0.72rem; color: var(--gray-3);
  letter-spacing: 0.06em; margin-top: 0.2rem;
}

.stat-div {
  width: 1px; height: 40px;
  background: var(--border);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute; bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column;
  align-items: center; gap: 0.5rem;
  font-size: 0.6rem; letter-spacing: 0.25em;
  text-transform: uppercase; color: var(--gray-3);
  animation: scrollBob 2.5s ease-in-out infinite;
}

.scroll-line {
  width: 1px; height: 48px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollGrow 2.5s ease-in-out infinite;
}

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

@keyframes scrollGrow {
  0%, 100% { height: 48px; opacity: 0.5; }
  50%       { height: 64px; opacity: 1; }
}

/* ── ABOUT ──────────────────────────────────────────── */
.about { background: var(--bg-2); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
  align-items: center;
}

@media (min-width: 900px) {
  .about-grid { grid-template-columns: 420px 1fr; }
}

.about-img-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: visible;
}

.about-img {
  width: 100%; border-radius: var(--radius-lg);
  filter: grayscale(20%);
  transition: filter var(--t-med);
}

.about-img:hover { filter: grayscale(0%); }

.img-badge {
  position: absolute; bottom: -1rem; right: -1rem;
  background: var(--accent);
  color: var(--white);
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: 0 8px 32px var(--accent-glow);
}

.badge-num {
  display: block;
  font-family: var(--font-head);
  font-size: 1.5rem; font-weight: 800; line-height: 1;
}

.badge-label {
  font-size: 0.65rem; letter-spacing: 0.12em;
  text-transform: uppercase; opacity: 0.85;
}

.about-p {
  font-size: 0.95rem; line-height: 1.8;
  color: var(--gray-2); font-weight: 300;
  margin-bottom: 1rem;
}

.about-chips {
  display: flex; flex-wrap: wrap; gap: 0.6rem;
  margin: 1.5rem 0 2rem;
}

.chip {
  display: flex; align-items: center; gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.78rem; color: var(--gray-1);
  transition: border-color var(--t-fast), transform var(--t-fast);
}

.chip:hover { border-color: var(--accent); transform: translateY(-2px); }

/* ── SKILLS ─────────────────────────────────────────── */
.skills { background: var(--bg); }

.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 600px)  { .skills-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .skills-grid { grid-template-columns: repeat(3, 1fr); } }

.skill-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color var(--t-med) var(--ease),
              transform var(--t-med) var(--ease),
              box-shadow var(--t-med) var(--ease);
  position: relative; overflow: hidden;
}

.skill-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--t-med) var(--ease);
}

.skill-card:hover {
  border-color: var(--border-hov);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.3);
}

.skill-card:hover::before { transform: scaleX(1); }

.skill-icon {
  font-size: 2rem; margin-bottom: 1rem;
  filter: grayscale(20%);
}

.skill-card h3 {
  font-family: var(--font-head);
  font-size: 1.1rem; font-weight: 600;
  margin-bottom: 1rem; color: var(--white);
}

.skill-tags {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
}

.skill-tags span {
  font-size: 0.72rem; padding: 0.3rem 0.7rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px; color: var(--gray-2);
}

/* ── EXPERIENCE TIMELINE ────────────────────────────── */
.experience { background: var(--bg-2); }

.timeline {
  position: relative;
  display: flex; flex-direction: column; gap: 0;
}

.timeline-item {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 0 1.5rem;
}

@media (min-width: 768px) {
  .timeline-item { gap: 0 2.5rem; }
}

.tl-marker {
  display: flex; flex-direction: column;
  align-items: center;
  padding-top: 1.5rem;
}

.tl-dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--bg);
  flex-shrink: 0; position: relative; z-index: 1;
  transition: background var(--t-fast);
}

.timeline-item:hover .tl-dot { background: var(--accent); }

.tl-line {
  width: 1px; flex: 1; min-height: 32px;
  background: linear-gradient(to bottom, var(--accent), var(--border));
  margin-top: 4px;
}

.tl-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  transition: border-color var(--t-fast), transform var(--t-fast);
}

.tl-card:hover {
  border-color: var(--border-hov);
  transform: translateX(4px);
}

.tl-header {
  display: flex; justify-content: space-between;
  align-items: flex-start; gap: 1rem;
  margin-bottom: 1rem; flex-wrap: wrap;
}

.tl-period {
  font-size: 0.72rem; color: var(--accent);
  letter-spacing: 0.08em; font-weight: 500;
  margin-bottom: 0.3rem; display: block;
}

.tl-role {
  font-family: var(--font-head);
  font-size: 1.05rem; font-weight: 600;
  color: var(--white); margin-bottom: 0.2rem;
}

.tl-company {
  font-size: 0.82rem; color: var(--gray-2);
}

.tl-type {
  font-size: 0.62rem; font-weight: 600;
  letter-spacing: 0.15em; text-transform: uppercase;
  padding: 0.3rem 0.7rem; border-radius: 4px;
  flex-shrink: 0;
}

.tl-type.work { background: rgba(0,122,255,0.15); color: var(--accent); }
.tl-type.edu  { background: rgba(52,199,89,0.15); color: #34C759; }
.tl-type.cert { background: rgba(255,149,0,0.15);  color: #FF9500; }

.tl-bullets {
  list-style: none; margin-bottom: 1.25rem;
}

.tl-bullets li {
  font-size: 0.88rem; color: var(--gray-2);
  line-height: 1.7; padding-left: 1.25rem;
  position: relative; margin-bottom: 0.4rem;
}

.tl-bullets li::before {
  content: '→';
  position: absolute; left: 0;
  color: var(--accent); font-size: 0.75rem;
}

.tl-stack {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
}

.tl-stack span {
  font-size: 0.68rem; padding: 0.25rem 0.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px; color: var(--gray-3);
}

/* ── PROJECTS ───────────────────────────────────────── */
.projects { background: var(--bg); }

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 700px)  { .projects-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .projects-grid { grid-template-columns: repeat(3, 1fr); } }

.proj-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--t-med) var(--ease),
              transform var(--t-med) var(--ease),
              box-shadow var(--t-med) var(--ease);
}

.proj-card:hover {
  border-color: var(--border-hov);
  transform: translateY(-6px);
  box-shadow: 0 24px 64px rgba(0,0,0,0.4);
}

.proj-card-featured {
  border-color: rgba(0,122,255,0.3);
}

.proj-media {
  position: relative; overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--surface);
}

.proj-media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.6s var(--ease), filter 0.4s;
  filter: brightness(0.85) saturate(0.9);
}

.proj-card:hover .proj-media img {
  transform: scale(1.06);
  filter: brightness(0.7) saturate(0.8);
}

/* Dark case study placeholder */
.proj-media-dark {
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-3);
}

.proj-case-study {
  text-align: center;
}

.cs-icon { font-size: 3rem; margin-bottom: 0.75rem; }
.cs-label {
  font-size: 0.72rem; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--gray-3);
}

/* Overlay on hover */
.proj-overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.75);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 1.25rem;
  opacity: 0;
  transition: opacity var(--t-med) var(--ease);
  padding: 2rem;
}

.proj-card:hover .proj-overlay { opacity: 1; }

.proj-stack {
  display: flex; flex-wrap: wrap; gap: 0.4rem; justify-content: center;
}

.proj-stack span {
  font-size: 0.68rem; padding: 0.3rem 0.65rem;
  background: rgba(0,122,255,0.2);
  border: 1px solid rgba(0,122,255,0.4);
  border-radius: 4px; color: var(--gray-1);
}

.proj-links { display: flex; gap: 0.75rem; flex-wrap: wrap; justify-content: center; }

.proj-link {
  font-size: 0.78rem; font-weight: 500;
  padding: 0.6rem 1.4rem;
  background: var(--accent); color: var(--white);
  border-radius: var(--radius);
  transition: background var(--t-fast), transform var(--t-fast);
}

.proj-link:hover { background: #0056CC; transform: translateY(-2px); }

.proj-link-ghost {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.3);
}

.proj-link-ghost:hover { background: rgba(255,255,255,0.1); border-color: white; }

.proj-info { padding: 1.5rem; }

.proj-cat {
  font-size: 0.65rem; font-weight: 600;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 0.5rem;
  display: block;
}

.proj-name {
  font-family: var(--font-head);
  font-size: 1.25rem; font-weight: 700;
  color: var(--white); margin-bottom: 0.6rem;
}

.proj-desc {
  font-size: 0.85rem; line-height: 1.7;
  color: var(--gray-2); font-weight: 300;
}

/* ── CERTIFICATIONS ─────────────────────────────────── */
.certs { background: var(--bg-2); }

.certs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 700px)  { .certs-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .certs-grid { grid-template-columns: repeat(3, 1fr); } }

.cert-card {
  display: flex; align-items: center; gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--t-fast), transform var(--t-fast);
}

.cert-card:hover {
  border-color: var(--border-hov);
  transform: translateX(4px);
}

.cert-logo {
  font-family: var(--font-head);
  font-size: 0.8rem; font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(0,122,255,0.3);
  border-radius: var(--radius);
  padding: 0.5rem 0.75rem;
  min-width: 52px; text-align: center;
  flex-shrink: 0;
}

.cert-info { flex: 1; min-width: 0; }

.cert-info h4 {
  font-size: 0.85rem; font-weight: 500;
  color: var(--white); line-height: 1.3;
  margin-bottom: 0.2rem;
}

.cert-info span {
  font-size: 0.72rem; color: var(--gray-3);
}

.cert-badge {
  font-size: 0.62rem; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: #34C759;
  background: rgba(52,199,89,0.1);
  border: 1px solid rgba(52,199,89,0.3);
  border-radius: 4px; padding: 0.25rem 0.6rem;
  flex-shrink: 0;
}

/* ── CONTACT ────────────────────────────────────────── */
.contact { background: var(--bg); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
}

@media (min-width: 900px) {
  .contact-grid { grid-template-columns: 1fr 1fr; gap: 5rem; }
}

.contact-desc {
  font-size: 0.95rem; line-height: 1.8;
  color: var(--gray-2); font-weight: 300;
  margin: 1.5rem 0 2rem;
}

.contact-links {
  display: flex; flex-direction: column; gap: 1rem;
  margin-bottom: 2rem;
}

.c-link {
  display: flex; align-items: center; gap: 1rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--t-fast), transform var(--t-fast), background var(--t-fast);
}

.c-link:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
  transform: translateX(4px);
}

.c-link-icon {
  font-size: 1.1rem; width: 36px; text-align: center;
  flex-shrink: 0;
}

.c-link-label {
  display: block;
  font-size: 0.68rem; color: var(--gray-3);
  letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 0.1rem;
}

.c-link-val {
  font-size: 0.88rem; color: var(--white); font-weight: 400;
}

.availability-badge {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.5rem 1rem;
  border: 1px solid rgba(52,199,89,0.3);
  background: rgba(52,199,89,0.08);
  border-radius: 20px;
  font-size: 0.78rem; color: #34C759;
}

.avail-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #34C759;
  animation: pulse 2s infinite;
}

/* Contact form */
.contact-form-wrap {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.form-row {
  display: grid; grid-template-columns: 1fr;
  gap: 1rem; margin-bottom: 1rem;
}

@media (min-width: 500px) {
  .form-row { grid-template-columns: 1fr 1fr; }
}

.form-group {
  display: flex; flex-direction: column;
  gap: 0.5rem; margin-bottom: 1rem; position: relative;
}

.form-group label {
  font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--gray-2);
}

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--white);
  padding: 0.85rem 1rem;
  font-family: var(--font-body); font-size: 0.9rem;
  outline: none;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  -webkit-appearance: none;
  resize: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--gray-3); }

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.form-group select option { background: var(--surface); }

.form-group.error input,
.form-group.error textarea {
  border-color: #FF3B30;
}

.form-error {
  font-size: 0.72rem; color: #FF3B30;
  display: none;
}

.form-group.error .form-error { display: block; }

.btn-submit {
  width: 100%;
  display: flex; align-items: center; justify-content: center; gap: 0.75rem;
  font-size: 0.9rem;
}

.btn-arrow { transition: transform var(--t-fast); }
.btn-submit:hover .btn-arrow { transform: translateX(4px); }

.form-success {
  display: none;
  align-items: center; gap: 1rem;
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  background: rgba(52,199,89,0.1);
  border: 1px solid rgba(52,199,89,0.3);
  border-radius: var(--radius);
  color: #34C759;
}

.form-success span { font-size: 1.2rem; }
.form-success p { font-size: 0.88rem; line-height: 1.5; }
.form-success.show { display: flex; }

/* ── FOOTER ─────────────────────────────────────────── */
.footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 3rem 0;
}

.footer-inner {
  display: flex; flex-direction: column;
  align-items: center; gap: 1.5rem; text-align: center;
}

@media (min-width: 700px) {
  .footer-inner {
    flex-direction: row; justify-content: space-between;
    text-align: left;
  }
}

.footer-logo {
  font-family: var(--font-head);
  font-size: 1.3rem; font-weight: 800;
  letter-spacing: 0.05em;
}

.footer-left p {
  font-size: 0.78rem; color: var(--gray-3);
  margin-top: 0.4rem;
}

.footer-copy, .footer-made {
  font-size: 0.75rem; color: var(--gray-3);
}

.footer-right { text-align: right; }

/* Back to top */
.back-top {
  position: fixed; bottom: 2rem; right: 2rem;
  z-index: 200;
  width: 44px; height: 44px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--white); font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transform: translateY(12px);
  transition: all var(--t-med) var(--ease);
}

.back-top.show {
  opacity: 1; pointer-events: all;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--accent);
  border-color: var(--accent);
}

/* ── RESPONSIVE UTILITY ─────────────────────────────── */
@media (max-width: 768px) {
  .section { padding: 5rem 0; }
  :root { --space-xl: 5rem; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .lang-toggle { display: none; }
  .float-tag { display: none; }
  .hero-stats { gap: 1.25rem; }
  .stat-div { height: 28px; }
  .about-img-frame { max-width: 380px; margin: 0 auto; }
  .contact-form-wrap { padding: 1.5rem; }
}

@media (max-width: 480px) {
  .hero-title { font-size: clamp(3rem, 16vw, 5rem); }
  .hero-ctas { flex-direction: column; }
  .btn-primary, .btn-ghost { width: 100%; justify-content: center; }
  .tl-card { padding: 1.25rem; }
  .cert-card { flex-wrap: wrap; }
}