/* =========================================================
   AMMAR HASSAN — PORTFOLIO STYLESHEET
   Palette: White + Dark Blue + Light Gray
   Display font: Poppins | Body font: Inter | Code font: JetBrains Mono
   ========================================================= */

/* ---------- Design Tokens ---------- */
:root {
  /* Colors */
  --navy-950: #071021;
  --navy-900: #0b1d3a;
  --navy-800: #122a52;
  --navy-700: #1a3868;
  --blue-500: #2f6fed;
  --blue-400: #5b8def;
  --blue-100: #e7eefd;
  --gray-50: #f5f7fb;
  --gray-100: #edf1f7;
  --gray-200: #e1e7f0;
  --gray-400: #93a0b6;
  --gray-500: #5b6b84;
  --gray-700: #33415c;
  --white: #ffffff;
  --success: #1fae66;
  --danger: #e2483d;

  /* Semantic (light theme default) */
  --bg: var(--white);
  --bg-alt: var(--gray-50);
  --bg-elevated: var(--white);
  --text-primary: var(--navy-900);
  --text-secondary: var(--gray-500);
  --border-color: var(--gray-200);
  --accent: var(--blue-500);
  --accent-soft: var(--blue-100);
  --nav-bg: rgba(255, 255, 255, 0.85);
  --code-bg: var(--navy-900);

  /* Typography */
  --font-display: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Layout */
  --container-w: 1180px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 2px 10px rgba(11, 29, 58, 0.06);
  --shadow-md: 0 12px 32px rgba(11, 29, 58, 0.10);
  --shadow-lg: 0 24px 60px rgba(11, 29, 58, 0.16);
  --nav-h: 76px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg: var(--navy-950);
  --bg-alt: #0d1930;
  --bg-elevated: #0f2040;
  --text-primary: #eef2f9;
  --text-secondary: #9fb0c9;
  --border-color: #1c2f52;
  --accent: var(--blue-400);
  --accent-soft: rgba(91, 141, 239, 0.14);
  --nav-bg: rgba(7, 16, 33, 0.85);
  --code-bg: #050c1a;
}

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; }

.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 120px 0; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--text-primary);
  line-height: 1.2;
}

.section-head { margin-bottom: 56px; max-width: 560px; }
.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.section-title {
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  font-weight: 700;
}

.text-gradient {
  background: linear-gradient(100deg, var(--navy-900) 0%, var(--blue-500) 60%, var(--blue-400) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
[data-theme="dark"] .text-gradient {
  background: linear-gradient(100deg, #ffffff 0%, var(--blue-400) 70%);
  -webkit-background-clip: text;
  background-clip: text;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--navy-900);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--blue-500); box-shadow: var(--shadow-md); transform: translateY(-2px); }

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border-color);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

.btn-outline {
  border: 1.5px solid var(--accent);
  color: var(--accent);
  background: transparent;
}
.btn-outline:hover { background: var(--accent); color: #fff; }

.btn-sm { padding: 9px 16px; font-size: 0.85rem; }
.btn-block { width: 100%; justify-content: center; }

/* ripple */
.btn::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  width: 10px; height: 10px;
  opacity: 0;
  transform: scale(1);
  top: var(--ripple-y, 50%);
  left: var(--ripple-x, 50%);
  translate: -50% -50%;
}
.btn.rippling::after {
  animation: ripple 0.55s ease-out;
}
@keyframes ripple {
  from { opacity: 0.6; transform: scale(0); }
  to { opacity: 0; transform: scale(22); }
}

/* ---------- Preloader ---------- */
.preloader {
  position: fixed;
  inset: 0;
  background: var(--navy-900);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}
.preloader.loaded { opacity: 0; visibility: hidden; }
.preloader-mark {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.05em;
  animation: pulse 1.1s ease-in-out infinite;
}
.preloader-mark span { color: var(--blue-400); }
@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 900;
  display: flex;
  align-items: center;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition), height var(--transition);
}
.navbar.scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm);
  height: 66px;
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--text-primary);
}
.brand-accent { color: var(--accent); }
.brand-bracket { color: var(--gray-400); }

.nav-links {
  display: flex;
  gap: 8px;
  align-items: center;
}
.nav-link {
  position: relative;
  padding: 8px 14px;
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-alt); }
.nav-link.active { color: var(--accent); }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 2px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.theme-toggle {
  width: 38px; height: 38px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  transition: color var(--transition), border-color var(--transition), transform var(--transition);
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); transform: rotate(-14deg); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
}
.hamburger span {
  width: 22px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: radial-gradient(ellipse 70% 60% at 60% 40%, black 10%, transparent 75%);
  opacity: 0.6;
}
.floating-shape {
  position: absolute;
  border-radius: 50%;
  filter: blur(10px);
  opacity: 0.35;
}
.shape-1 { width: 340px; height: 340px; background: var(--blue-400); top: -80px; right: 8%; animation: float 9s ease-in-out infinite; }
.shape-2 { width: 220px; height: 220px; background: var(--navy-700); bottom: 10%; right: 28%; animation: float 11s ease-in-out infinite reverse; }
.shape-3 { width: 160px; height: 160px; background: var(--accent-soft); top: 40%; left: -60px; animation: float 7s ease-in-out infinite; }
@keyframes float {
  0%, 100% { transform: translateY(0) translateX(0); }
  50% { transform: translateY(-26px) translateX(14px); }
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 60px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 7px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.eyebrow-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse 1.6s ease-in-out infinite;
}

.hero-heading {
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  font-weight: 700;
  margin-bottom: 14px;
}

.hero-subheading {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  color: var(--accent);
  min-height: 1.6em;
  margin-bottom: 18px;
}
.hero-subheading::after {
  content: "";
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--accent);
  margin-left: 3px;
  vertical-align: -2px;
  animation: blink 0.9s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-desc {
  color: var(--text-secondary);
  max-width: 480px;
  margin-bottom: 32px;
  font-size: 1.02rem;
}

.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }

.hero-stats { display: flex; gap: 40px; }
.stat { display: flex; flex-direction: column; }
.stat-num { font-family: var(--font-display); font-size: 1.9rem; font-weight: 700; color: var(--text-primary); }
.stat-label { font-size: 0.82rem; color: var(--text-secondary); }

/* Code window (hero signature element) */
.hero-visual { display: flex; justify-content: center; }
.code-window {
  width: 100%;
  max-width: 460px;
  background: var(--code-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: rotate(1.2deg);
  transition: transform var(--transition);
}
.code-window:hover { transform: rotate(0deg) translateY(-4px); }

.code-window-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }
.code-window-title {
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #8a9bb8;
}

.code-window-body {
  padding: 22px 20px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.7;
  color: #d7e1f2;
  overflow-x: auto;
}
.c-key { color: #ff79c6; }
.c-var { color: #8be9fd; }
.c-prop { color: #79c0ff; }
.c-str { color: #a5e075; }
.c-bool { color: #ffb86c; }
.c-fn { color: #d0a8ff; }

.scroll-cue {
  position: absolute;
  bottom: 34px;
  left: 50%;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 2px solid var(--border-color);
  border-radius: 20px;
  z-index: 1;
}
.scroll-cue span {
  position: absolute;
  top: 8px; left: 50%;
  width: 4px; height: 8px;
  background: var(--accent);
  border-radius: 3px;
  transform: translateX(-50%);
  animation: scrollcue 1.6s ease-in-out infinite;
}
@keyframes scrollcue {
  0% { opacity: 1; top: 8px; }
  70% { opacity: 0; top: 20px; }
  100% { opacity: 0; top: 8px; }
}

/* ---------- About ---------- */
.about { background: var(--bg-alt); }
.about-grid {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 64px;
  align-items: start;
}
.about-image-frame {
  position: relative;
  aspect-ratio: 4 / 5;
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, var(--navy-900), var(--blue-500));
  padding: 3px;
  box-shadow: var(--shadow-md);
}
.about-image-placeholder {
  width: 100%; height: 100%;
  border-radius: calc(var(--radius-lg) - 3px);
  background: var(--bg-elevated);
  display: flex; align-items: center; justify-content: center;
  font-size: 4rem;
  color: var(--border-color);
  overflow: hidden;
}
.about-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}
.about-image-badge {
  position: absolute;
  bottom: -18px; left: 50%;
  transform: translateX(-50%);
  background: var(--bg-elevated);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 999px;
  box-shadow: var(--shadow-md);
  white-space: nowrap;
  display: flex; align-items: center; gap: 8px;
}

.about-text { color: var(--text-secondary); margin-bottom: 18px; max-width: 620px; }

.info-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 30px;
}
.info-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.info-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-sm); border-color: var(--accent); }
.info-icon {
  width: 40px; height: 40px;
  min-width: 40px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
}
.info-label { display: block; font-size: 0.76rem; color: var(--text-secondary); }
.info-value { display: block; font-weight: 600; font-size: 0.92rem; word-break: break-word; }

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.skill-group {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.skill-group:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.skill-group-title {
  display: flex; align-items: center; gap: 10px;
  font-size: 1rem;
  margin-bottom: 20px;
  color: var(--accent);
}
.skill-group-title-spaced { margin-top: 26px; }

.skill-item { margin-bottom: 18px; }
.skill-item:last-child { margin-bottom: 0; }
.skill-item-head {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  margin-bottom: 8px;
}
.skill-item-head span:first-child { display: flex; align-items: center; gap: 8px; color: var(--text-primary); }
.skill-percent { color: var(--text-secondary); font-family: var(--font-mono); font-size: 0.8rem; }

.skill-bar {
  height: 7px;
  background: var(--bg-alt);
  border-radius: 999px;
  overflow: hidden;
}
.skill-bar-fill {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--navy-900), var(--blue-500));
  transition: width 1.1s cubic-bezier(0.4, 0, 0.2, 1);
}
[data-theme="dark"] .skill-bar-fill { background: linear-gradient(90deg, var(--blue-500), var(--blue-400)); }

/* ---------- Projects ---------- */
.projects { background: var(--bg-alt); }
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.project-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.project-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }

.project-thumb {
  height: 170px;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.6rem;
  color: #fff;
}
.project-thumb-1 { background: linear-gradient(135deg, var(--navy-900), var(--blue-500)); }
.project-thumb-2 { background: linear-gradient(135deg, #12294f, #3a7bd5); }
.project-thumb-3 { background: linear-gradient(135deg, #1a3868, #5b8def); }
.project-thumb-4 { background: linear-gradient(135deg, #0b1d3a, #2f6fed); }
.project-thumb-5 { background: linear-gradient(135deg, #122a52, #4d84e8); }

.project-body { padding: 24px; }
.project-title { font-size: 1.08rem; margin-bottom: 8px; }
.project-desc { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 16px; }
.project-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.project-tags span {
  font-size: 0.74rem;
  font-family: var(--font-mono);
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}
.project-links { display: flex; gap: 18px; }
.project-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex; align-items: center; gap: 6px;
  transition: color var(--transition);
}
.project-link:hover { color: var(--accent); }

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 60px;
}
.contact-lead { color: var(--text-secondary); margin-bottom: 30px; max-width: 420px; }
.contact-item {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 18px;
}
.contact-item i {
  width: 42px; height: 42px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
}

.social-icons { display: flex; gap: 12px; margin-top: 28px; }
.social-icons a {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.social-icons a:hover { background: var(--accent); color: #fff; border-color: var(--accent); transform: translateY(-3px); }

.contact-form {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px;
  box-shadow: var(--shadow-sm);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 18px; display: flex; flex-direction: column; }
.form-group label { font-size: 0.84rem; font-weight: 600; margin-bottom: 8px; }
.form-group input, .form-group textarea {
  padding: 12px 14px;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-alt);
  color: var(--text-primary);
  font-size: 0.92rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}
.form-group input:focus, .form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  outline: none;
}
.form-group.error input, .form-group.error textarea { border-color: var(--danger); }
.form-error {
  font-size: 0.78rem;
  color: var(--danger);
  min-height: 1.1em;
  margin-top: 4px;
}
.form-success {
  margin-top: 14px;
  font-size: 0.88rem;
  color: var(--success);
  text-align: center;
  min-height: 1.2em;
}

/* ---------- Footer ---------- */
.footer { background: var(--navy-900); color: #cfd9ec; padding: 56px 0 0; }
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 34px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-brand { color: #fff; }
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-links a { color: #a9b8d6; font-size: 0.9rem; transition: color var(--transition); }
.footer-links a:hover { color: #fff; }
.footer-social a { border-color: rgba(255, 255, 255, 0.16); color: #cfd9ec; }
.footer-social a:hover { background: var(--blue-400); border-color: var(--blue-400); }
.footer-bottom {
  text-align: center;
  padding: 22px 0;
  font-size: 0.82rem;
  color: #8496b8;
}

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  bottom: 28px; right: 28px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--navy-900);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition);
  z-index: 500;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--accent); transform: translateY(-4px); }

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-buttons { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { order: -1; margin-bottom: 20px; }
  .about-grid { grid-template-columns: 1fr; }
  .about-image-frame { max-width: 340px; margin: 0 auto; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 780px) {
  section { padding: 88px 0; }
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg-elevated);
    padding: 14px 24px 26px;
    box-shadow: var(--shadow-md);
    transform: translateY(-140%);
    opacity: 0;
    transition: transform var(--transition), opacity var(--transition);
    z-index: 800;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; }
  .nav-link { padding: 12px 8px; border-bottom: 1px solid var(--border-color); border-radius: 0; }
  .hamburger { display: flex; }
  .nav-resume { display: none; }
  .skills-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .info-cards { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .hero-stats { gap: 22px; }
  .hero-buttons { flex-direction: column; width: 100%; }
  .hero-buttons .btn { width: 100%; justify-content: center; }
  .code-window { transform: none; }
}