/* ==========================================================================
   style.css — Ammarah Umer / Portfolio
   Table of contents:
     1. Reset
     2. Design tokens (variables)
     3. Typography
     4. Layout primitives
     5. Components (buttons, cards, badges, forms, nav, footer)
     6. Sections (hero, about, skills, projects, education, contact)
     7. Animations
     8. Responsive breakpoints
   ========================================================================== */

/* ---------------------------------------------------------------------- */
/* 1. RESET                                                               */
/* ---------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { min-height: 100vh; }
img, picture, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; color: inherit; }
ul, ol { list-style: none; }
a { text-decoration: none; color: inherit; }
button { background: none; border: none; cursor: pointer; }

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

/* ---------------------------------------------------------------------- */
/* 2. DESIGN TOKENS                                                       */
/* ---------------------------------------------------------------------- */
:root {
  /* Colors — dark (default) */
  --color-bg: #0F172A;
  --color-surface: #1E293B;
  --color-surface-alt: #172033;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-accent: #06b6d4;
  --color-text: #F8FAFC;
  --color-text-muted: #94A3B8;
  --color-border: #334155;
  --color-success: #22c55e;
  --color-danger: #ef4444;

  /* Typography */
  --font-heading: "Poppins", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "Fira Code", monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;
  --text-3xl: 3rem;
  --text-4xl: 3.5rem;

  /* Spacing (8px system) */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;
  --space-3xl: 6rem;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-lg: 0 20px 40px rgba(0,0,0,0.30);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Layout */
  --container-width: 1200px;

  /* Z-index */
  --z-nav: 100;
  --z-overlay: 200;
  --z-toast: 300;
}

[data-theme="light"] {
  --color-bg: #FFFFFF;
  --color-surface: #F8FAFC;
  --color-surface-alt: #F1F5F9;
  --color-text: #1E293B;
  --color-text-muted: #64748B;
  --color-border: #E2E8F0;
}

/* ---------------------------------------------------------------------- */
/* 3. TYPOGRAPHY                                                          */
/* ---------------------------------------------------------------------- */
body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  font-size: var(--text-md);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text);
}

h1 { font-size: var(--text-4xl); font-weight: 700; }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-xl); }
p { color: var(--color-text-muted); }

a { transition: color var(--transition-fast); }

code, .mono { font-family: var(--font-mono); }

::selection {
  background: var(--color-accent);
  color: #0F172A;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  letter-spacing: 0.05em;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.section-heading .index {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.section-lede {
  max-width: 60ch;
  margin-top: var(--space-xs);
}

/* ---------------------------------------------------------------------- */
/* 4. LAYOUT                                                              */
/* ---------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.section {
  padding-block: var(--space-3xl);
  border-bottom: 1px solid var(--color-border);
}

.section--tight { padding-block: var(--space-2xl); }

.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.flex { display: flex; }
.flex--center { align-items: center; justify-content: center; }
.flex--between { align-items: center; justify-content: space-between; }
.flex--gap-sm { gap: var(--space-sm); }
.flex--gap-md { gap: var(--space-md); }
.flex--wrap { flex-wrap: wrap; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-sm);
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  z-index: 999;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: var(--space-sm);
}

/* ---------------------------------------------------------------------- */
/* 5. COMPONENTS                                                          */
/* ---------------------------------------------------------------------- */

/* Focus visibility (accessibility) */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-sm);
  min-height: 44px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover { background: var(--color-primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn--outline:hover { border-color: var(--color-accent); color: var(--color-accent); transform: translateY(-2px); }

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  padding: 0.6rem 1rem;
}
.btn--ghost:hover { color: var(--color-text); }

.btn--sm { padding: 0.55rem 1.1rem; font-size: var(--text-xs); }
.btn--full { width: 100%; }

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

/* Badges / tags */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.badge--status-completed { color: var(--color-success); border-color: var(--color-success); }
.badge--status-progress { color: #eab308; border-color: #eab308; }
.badge--accent { color: var(--color-accent); border-color: var(--color-accent); }

.tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
}

/* Forms */
.form-group { margin-bottom: var(--space-md); }
.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}
.form-input,
.form-textarea {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  color: var(--color-text);
  transition: border-color var(--transition-fast);
}
.form-input:focus, .form-textarea:focus { border-color: var(--color-accent); outline: none; }
.form-textarea { min-height: 140px; resize: vertical; }
.form-error {
  color: var(--color-danger);
  font-size: var(--text-xs);
  margin-top: var(--space-xs);
  display: none;
}
.form-error.is-visible { display: block; }
.form-input[aria-invalid="true"],
.form-textarea[aria-invalid="true"] { border-color: var(--color-danger); }

.form-status {
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  display: none;
}
.form-status.is-visible { display: block; }
.form-status--success { background: rgba(34,197,94,0.12); color: var(--color-success); border: 1px solid var(--color-success); }
.form-status--error { background: rgba(239,68,68,0.12); color: var(--color-danger); border: 1px solid var(--color-danger); }

/* Navigation */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  padding-block: var(--space-sm);
  background: transparent;
  transition: background-color var(--transition-normal), box-shadow var(--transition-normal), backdrop-filter var(--transition-normal);
}
.navbar.is-scrolled {
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--color-border);
}
[data-theme="light"] .navbar.is-scrolled { background: rgba(255, 255, 255, 0.8); }

.navbar__inner { display: flex; align-items: center; justify-content: space-between; }
.navbar__logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
}
.navbar__logo span { color: var(--color-accent); }

.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.navbar__link {
  position: relative;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding-block: 0.25rem;
}
.navbar__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-fast);
}
.navbar__link:hover, .navbar__link[aria-current="page"] { color: var(--color-text); }
.navbar__link:hover::after, .navbar__link[aria-current="page"]::after { width: 100%; }

.navbar__actions { display: flex; align-items: center; gap: var(--space-sm); }

.theme-toggle {
  width: 44px; height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}
.theme-toggle:hover { border-color: var(--color-accent); transform: rotate(15deg); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }

.hamburger {
  display: none;
  width: 44px; height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.hamburger__bar {
  width: 22px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.hamburger.is-active .hamburger__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.is-active .hamburger__bar:nth-child(2) { opacity: 0; }
.hamburger.is-active .hamburger__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-drawer {
  position: fixed;
  top: 0; right: 0;
  height: 100vh;
  width: min(78vw, 320px);
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  z-index: var(--z-overlay);
  padding: var(--space-2xl) var(--space-lg) var(--space-lg);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}
.mobile-drawer.is-open { transform: translateX(0); }
.mobile-drawer__links { display: flex; flex-direction: column; gap: var(--space-md); }
.mobile-drawer__link { font-size: var(--text-lg); font-family: var(--font-heading); }
.drawer-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 199;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}
.drawer-overlay.is-visible { opacity: 1; pointer-events: auto; }

/* Scroll progress bar */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  z-index: calc(var(--z-nav) + 1);
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity var(--transition-normal), transform var(--transition-normal), background-color var(--transition-fast);
  z-index: var(--z-nav);
}
.back-to-top.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover { background: var(--color-primary-dark); }

/* Social links */
.social-links { display: flex; gap: var(--space-sm); }
.social-links__item {
  width: 44px; height: 44px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}
.social-links__item:hover { border-color: var(--color-accent); color: var(--color-accent); transform: translateY(-3px); }
.social-links__item svg { width: 18px; height: 18px; }

/* Footer */
.footer {
  padding-block: var(--space-xl);
}
.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  text-align: center;
}
.footer__links { display: flex; gap: var(--space-lg); flex-wrap: wrap; justify-content: center; }
.footer__copy { font-size: var(--text-sm); color: var(--color-text-muted); }

/* ---------------------------------------------------------------------- */
/* 6. SECTIONS                                                            */
/* ---------------------------------------------------------------------- */

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--space-3xl);
  border-bottom: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -20%; right: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(37,99,235,0.18), transparent 70%);
  pointer-events: none;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-2xl);
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero__greeting { font-family: var(--font-mono); color: var(--color-accent); font-size: var(--text-md); }
.hero__name { margin-top: var(--space-xs); }
.hero__title {
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  margin-top: var(--space-sm);
  min-height: 1.6em;
}
.hero__title .cursor { color: var(--color-accent); animation: blink 1s step-end infinite; }
.hero__lede { margin-top: var(--space-md); max-width: 52ch; font-size: var(--text-lg); }
.hero__actions { display: flex; gap: var(--space-md); margin-top: var(--space-xl); flex-wrap: wrap; }
.hero__social { margin-top: var(--space-xl); }

.hero__panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.hero__panel-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface-alt);
  border-bottom: 1px solid var(--color-border);
}
.hero__panel-dot { width: 11px; height: 11px; border-radius: 50%; }
.hero__panel-dot--red { background: #ef4444; }
.hero__panel-dot--yellow { background: #eab308; }
.hero__panel-dot--green { background: #22c55e; }
.hero__panel-file { margin-left: var(--space-sm); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-muted); }
.hero__panel-body {
  padding: var(--space-lg);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.9;
  overflow-x: auto;
}
.tok-key { color: #93c5fd; }
.tok-str { color: #06b6d4; }
.tok-punc { color: var(--color-text-muted); }
.tok-kw { color: #c084fc; }
.tok-com { color: var(--color-text-muted); font-style: italic; }

.hero__scroll-indicator {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
}
.hero__scroll-indicator .chevron { animation: bounce 2s ease-in-out infinite; }

/* About */
.about__grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: var(--space-2xl);
  align-items: start;
}
.about__portrait {
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: linear-gradient(145deg, var(--color-surface), var(--color-surface-alt));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  color: var(--color-accent);
  max-width: 320px;
  box-shadow: var(--shadow-lg);
}
.about__bio p { margin-bottom: var(--space-md); }
.about__highlights {
  margin-top: var(--space-lg);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}
.highlight-card {
  padding: var(--space-md);
  text-align: center;
}
.highlight-card__value { font-family: var(--font-mono); font-size: var(--text-xl); color: var(--color-accent); }
.highlight-card__label { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: 0.25rem; }

/* Skills */
.skills__categories { display: flex; flex-direction: column; gap: var(--space-lg); }
.skill-category__title {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}
.skill-category__badges { display: flex; flex-wrap: wrap; gap: var(--space-xs); }
.skill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  font-size: var(--text-sm);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}
.skill-badge:hover { border-color: var(--color-accent); transform: translateY(-2px); }
.skill-badge__dot { width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent); }

/* Projects */
.projects__filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-xl);
}
.filter-btn {
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}
.filter-btn:hover { color: var(--color-text); border-color: var(--color-accent); }
.filter-btn.is-active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

.projects__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.project-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}
.project-card__media {
  aspect-ratio: 16/9;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}
.project-card__media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.project-card:hover .project-card__media img { transform: scale(1.06); }
.project-card__body { padding: var(--space-md); display: flex; flex-direction: column; gap: var(--space-sm); flex: 1; }
.project-card__meta { display: flex; justify-content: space-between; align-items: center; }
.project-card__title { font-size: var(--text-lg); }
.project-card__desc { font-size: var(--text-sm); flex: 1; }
.project-card__features { display: flex; flex-direction: column; gap: 0.35rem; }
.project-card__features li { font-size: var(--text-xs); color: var(--color-text-muted); padding-left: 1rem; position: relative; }
.project-card__features li::before { content: "→"; position: absolute; left: 0; color: var(--color-accent); }
.project-card__tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.project-card__actions { display: flex; gap: var(--space-sm); margin-top: auto; padding-top: var(--space-sm); }

/* Education / Experience timeline */
.timeline { position: relative; padding-left: var(--space-xl); }
.timeline::before {
  content: "";
  position: absolute;
  left: 7px; top: 6px; bottom: 6px;
  width: 2px;
  background: var(--color-border);
}
.timeline__item { position: relative; padding-bottom: var(--space-xl); }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__dot {
  position: absolute;
  left: calc(-1 * var(--space-xl));
  top: 4px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
}
.timeline__period { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-accent); }
.timeline__title { margin-top: 0.25rem; }
.timeline__org { color: var(--color-text-muted); font-size: var(--text-sm); margin-top: 0.15rem; }
.timeline__desc { margin-top: var(--space-xs); font-size: var(--text-sm); }

.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.cert-card { padding: var(--space-md); }
.cert-card__title { font-size: var(--text-md); }
.cert-card__meta { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: 0.25rem; }

.resume-cta {
  margin-top: var(--space-2xl);
  padding: var(--space-xl);
  text-align: center;
  background: linear-gradient(135deg, rgba(37,99,235,0.12), rgba(6,182,212,0.12));
  border: 1px solid var(--color-border);
}
.resume-cta h3 { margin-bottom: var(--space-xs); }
.resume-cta p { max-width: 50ch; margin-inline: auto; margin-bottom: var(--space-lg); }

/* Contact */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}
.contact-info { display: flex; flex-direction: column; gap: var(--space-md); }
.contact-info__card {
  padding: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}
.contact-info__icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-accent);
  flex-shrink: 0;
}
.contact-info__icon svg { width: 20px; height: 20px; }
.contact-info__label { font-size: var(--text-xs); color: var(--color-text-muted); }
.contact-info__value { font-size: var(--text-sm); font-weight: 600; }

.availability-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-sm);
}
.availability-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 0 0 rgba(34,197,94,0.6);
  animation: pulse 2s infinite;
}

.contact-form { padding: var(--space-lg); }

/* 404 page */
.error-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--space-md);
  padding: var(--space-lg);
}
.error-page__code {
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  color: var(--color-accent);
}

/* ---------------------------------------------------------------------- */
/* 7. ANIMATIONS                                                          */
/* ---------------------------------------------------------------------- */
@keyframes blink { 50% { opacity: 0; } }

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

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(34,197,94,0.6); }
  70% { box-shadow: 0 0 0 8px rgba(34,197,94,0); }
  100% { box-shadow: 0 0 0 0 rgba(34,197,94,0); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-stagger.is-visible > * {
  animation: fadeUp 0.6s ease forwards;
}
.reveal-stagger.is-visible > *:nth-child(1) { animation-delay: 0.05s; }
.reveal-stagger.is-visible > *:nth-child(2) { animation-delay: 0.12s; }
.reveal-stagger.is-visible > *:nth-child(3) { animation-delay: 0.19s; }
.reveal-stagger.is-visible > *:nth-child(4) { animation-delay: 0.26s; }
.reveal-stagger.is-visible > *:nth-child(5) { animation-delay: 0.33s; }
.reveal-stagger.is-visible > *:nth-child(6) { animation-delay: 0.4s; }
.reveal-stagger.is-visible > *:nth-child(7) { animation-delay: 0.47s; }

/* ---------------------------------------------------------------------- */
/* 8. RESPONSIVE                                                          */
/* ---------------------------------------------------------------------- */

/* Laptop */
@media (max-width: 1439px) {
  :root { --container-width: 1080px; }
}

/* Tablet */
@media (max-width: 1023px) {
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }

  .hero__grid { grid-template-columns: 1fr; text-align: left; }
  .hero__panel { max-width: 560px; }

  .about__grid { grid-template-columns: 1fr; }
  .about__portrait { margin-inline: auto; }
  .about__highlights { grid-template-columns: repeat(2, 1fr); }

  .projects__grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .contact__grid { grid-template-columns: 1fr; }

  .navbar__links { display: none; }
  .hamburger { display: flex; }
}

/* Mobile */
@media (max-width: 767px) {
  .container { padding-inline: var(--space-sm); }
  .section { padding-block: var(--space-2xl); }

  h1 { font-size: var(--text-2xl); }
  h2 { font-size: var(--text-xl); }

  .hero { padding-top: var(--space-2xl); min-height: auto; padding-bottom: var(--space-2xl); }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn { width: 100%; }

  .about__highlights { grid-template-columns: repeat(2, 1fr); }

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

  .footer__inner { text-align: center; }

  .back-to-top { right: var(--space-sm); bottom: var(--space-sm); }
}

@media (max-width: 420px) {
  .about__highlights { grid-template-columns: 1fr 1fr; }
}