/* ============================================================
   Md. Talal Wasim — Portfolio
   Modern dark theme with gradient accents + light mode
   ============================================================ */

:root {
  --bg: #0a0e1a;
  --bg-alt: #0e1425;
  --surface: #141b2e;
  --surface-2: #1a2340;
  --border: rgba(148, 163, 255, 0.12);
  --text: #e6e9f5;
  --text-muted: #97a0bd;
  --primary: #6366f1;
  --primary-2: #a855f7;
  --cyan: #22d3ee;
  --gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #22d3ee 100%);
  --gradient-soft: linear-gradient(135deg, rgba(99,102,241,.15), rgba(168,85,247,.15));
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  --radius: 16px;
  --nav-h: 72px;
  --font-head: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

html[data-theme="light"] {
  --bg: #f7f8fd;
  --bg-alt: #eef1fa;
  --surface: #ffffff;
  --surface-2: #f2f4fc;
  --border: rgba(70, 80, 160, 0.14);
  --text: #171c30;
  --text-muted: #5a6382;
  --shadow: 0 20px 50px rgba(80, 90, 180, 0.12);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.4s ease;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container {
  width: min(1140px, 92%);
  margin-inline: auto;
}

.center { text-align: center; margin-top: 3rem; }

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.accent { color: var(--primary-2); }

/* ---------- Reveal animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.85rem 1.7rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  font-family: var(--font-head);
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
  border: none;
}
.btn svg { width: 18px; height: 18px; }
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 8px 24px rgba(124, 96, 245, 0.35);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(124, 96, 245, 0.5);
}
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
  box-shadow: none;
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-3px);
}
.btn-lg { padding: 1.05rem 2.4rem; font-size: 1.05rem; }

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  z-index: 1000;
  transition: background 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
}
.navbar.scrolled {
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.25);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  width: min(1200px, 94%);
  margin-inline: auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
}
.logo-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: var(--gradient);
  color: #fff;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  gap: 0.35rem;
}
.nav-link {
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.25s, background 0.25s;
}
.nav-link:hover { color: var(--text); }
.nav-link.active {
  color: var(--text);
  background: var(--gradient-soft);
}

.nav-actions { display: flex; align-items: center; gap: 0.6rem; }

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: border-color 0.25s, transform 0.25s;
}
.theme-toggle:hover { border-color: var(--primary); transform: rotate(15deg); }
.theme-toggle svg { width: 19px; height: 19px; }
.icon-sun { display: none; }
html[data-theme="light"] .icon-sun { display: block; }
html[data-theme="light"] .icon-moon { display: none; }
html:not([data-theme="light"]) .icon-sun { display: none; }
html:not([data-theme="light"]) .icon-moon { display: block; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.hamburger span {
  width: 24px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.3s, opacity 0.3s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 2rem) 0 4rem;
  overflow: hidden;
}

.hero-bg { position: absolute; inset: 0; z-index: -1; }
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  animation: drift 14s ease-in-out infinite alternate;
}
.orb-1 { width: 420px; height: 420px; background: #6366f1; top: -8%; left: -6%; }
.orb-2 { width: 360px; height: 360px; background: #a855f7; bottom: -10%; right: -4%; animation-delay: -5s; }
.orb-3 { width: 280px; height: 280px; background: #22d3ee; top: 40%; left: 55%; opacity: 0.2; animation-delay: -9s; }

@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(50px, 40px) scale(1.12); }
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, black 30%, transparent 75%);
  opacity: 0.5;
}

.hero-content {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 3rem;
}

.hero-greeting {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 1rem;
  margin-bottom: 0.6rem;
}
.wave { display: inline-block; animation: wave 2.2s ease-in-out infinite; transform-origin: 70% 70%; }
@keyframes wave {
  0%, 55%, 100% { transform: rotate(0); }
  10% { transform: rotate(16deg); }
  20% { transform: rotate(-8deg); }
  30% { transform: rotate(14deg); }
  40% { transform: rotate(-4deg); }
  50% { transform: rotate(8deg); }
}

.hero-name {
  font-family: var(--font-head);
  font-size: clamp(2.6rem, 6vw, 4.3rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 0.8rem;
}

.hero-role {
  font-family: var(--font-head);
  font-size: clamp(1.25rem, 2.8vw, 1.8rem);
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 1.4rem;
  min-height: 2.4rem;
}
.typed-text { color: var(--primary-2); }
.cursor {
  color: var(--cyan);
  font-weight: 400;
  animation: blink 0.9s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-desc {
  max-width: 560px;
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 2.2rem; }

.hero-socials { display: flex; gap: 0.9rem; }
.hero-socials a {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  border: 1.5px solid var(--border);
  color: var(--text-muted);
  transition: all 0.25s ease;
}
.hero-socials a:hover {
  color: #fff;
  background: var(--gradient);
  border-color: transparent;
  transform: translateY(-4px);
}
.hero-socials svg { width: 21px; height: 21px; }

/* Hero visual */
.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
}
.avatar-ring {
  position: relative;
  width: min(340px, 75vw);
  aspect-ratio: 1;
  border-radius: 50%;
  padding: 8px;
  background: conic-gradient(from 0deg, #6366f1, #a855f7, #22d3ee, #6366f1);
  animation: spin 9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 6px solid var(--bg);
  animation: spin 9s linear infinite reverse; /* counter-rotate so the photo stays upright */
}

.floating-badge {
  position: absolute;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.88rem;
  box-shadow: var(--shadow);
  animation: floaty 5s ease-in-out infinite;
}
.badge-java   { top: 6%; left: 0; animation-delay: 0s; }
.badge-spring { bottom: 14%; right: -2%; animation-delay: -1.6s; }
.badge-api    { bottom: -2%; left: 12%; animation-delay: -3.2s; }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.scroll-down {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-muted);
  animation: bounce 2s infinite;
}
.scroll-down svg { width: 22px; height: 22px; }
@keyframes bounce {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 9px); }
}

/* ============================================================
   STATS
   ============================================================ */
.stats { padding: 1rem 0 0; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
  transform: translateY(-40px);
}
.stat-card {
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem 1rem;
  text-align: center;
  box-shadow: var(--shadow);
}
.stat-number, .stat-plus {
  font-family: var(--font-head);
  font-size: 2.3rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat-card p { color: var(--text-muted); font-size: 0.92rem; margin-top: 0.25rem; }

/* ============================================================
   SECTIONS (shared)
   ============================================================ */
.section { padding: 6rem 0; }
.section-alt { background: var(--bg-alt); }

.section-head { text-align: center; margin-bottom: 3.5rem; }
.section-tag {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}
.section-title {
  font-family: var(--font-head);
  font-size: clamp(1.9rem, 4.5vw, 2.7rem);
  font-weight: 700;
}
.section-sub {
  color: var(--text-muted);
  max-width: 520px;
  margin: 0.9rem auto 0;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 3.5rem;
  align-items: center;
}

.code-window {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.code-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0.8rem 1.1rem;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }
.code-filename {
  margin-left: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}
.code-body {
  padding: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.75;
  overflow-x: auto;
  color: var(--text);
}
.code-body .kw  { color: #c792ea; }
.code-body .cls { color: #22d3ee; }
.code-body .str { color: #a5e07f; }
html[data-theme="light"] .code-body .kw  { color: #9333ea; }
html[data-theme="light"] .code-body .cls { color: #0891b2; }
html[data-theme="light"] .code-body .str { color: #16a34a; }

.about-text h3 {
  font-family: var(--font-head);
  font-size: 1.45rem;
  margin-bottom: 1rem;
}
.about-text p { color: var(--text-muted); margin-bottom: 1rem; }
.about-text strong { color: var(--text); }

.about-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.7rem;
  margin: 1.4rem 0 1.8rem;
}
.about-facts li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.94rem;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.65rem 0.9rem;
}

/* ============================================================
   EXPERIENCE TIMELINE
   ============================================================ */
.timeline {
  position: relative;
  max-width: 860px;
  margin-inline: auto;
  padding-left: 2.2rem;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, #6366f1, #a855f7, #22d3ee);
  border-radius: 2px;
  opacity: 0.55;
}
.timeline-item { position: relative; padding-bottom: 2.2rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -2.2rem;
  top: 26px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--gradient);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--primary) 20%, transparent);
}
.timeline-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.7rem 1.9rem;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.timeline-card:hover {
  transform: translateX(6px);
  border-color: rgba(124, 96, 245, 0.5);
  box-shadow: var(--shadow);
}
.timeline-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}
.timeline-head h3 {
  font-family: var(--font-head);
  font-size: 1.2rem;
}
.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--cyan);
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.28rem 0.85rem;
  white-space: nowrap;
}
.timeline-company {
  font-weight: 600;
  margin-top: 0.35rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  width: fit-content;
}
.timeline-note {
  -webkit-text-fill-color: var(--text-muted);
  font-weight: 400;
  font-size: 0.88rem;
}
.timeline-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0.7rem;
  margin-bottom: 0.5rem;
}
.timeline-desc strong { color: var(--text); }
.timeline-card .project-tags { margin-top: 0.9rem; }
.current-badge {
  display: inline-block;
  vertical-align: middle;
  margin-left: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: #4ade80;
  background: rgba(74, 222, 128, 0.12);
  border: 1px solid rgba(74, 222, 128, 0.35);
  border-radius: 999px;
  padding: 0.18rem 0.65rem;
}

/* ============================================================
   EDUCATION
   ============================================================ */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  max-width: 1000px;
  margin-inline: auto;
}
.edu-card {
  display: flex;
  gap: 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.edu-card:hover {
  transform: translateY(-6px);
  border-color: rgba(34, 211, 238, 0.45);
  box-shadow: var(--shadow);
}
.edu-icon {
  font-size: 2rem;
  width: 58px;
  height: 58px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
}
.edu-body { min-width: 0; }
.edu-body .timeline-head h3 { font-size: 1.08rem; }

/* Professional project badge */
.pro-badge {
  background: var(--gradient-soft);
  border-color: rgba(124, 96, 245, 0.45);
  color: var(--primary-2);
}
.project-pro { border-color: rgba(124, 96, 245, 0.35); }

/* GitHub contribution chart */
.gh-contrib {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.6rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
}
.gh-contrib-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.9rem;
}
.gh-contrib img { width: 100%; min-width: 640px; }

/* ============================================================
   SKILLS
   ============================================================ */
.skills-groups {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.skill-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.skill-group:hover { transform: translateY(-5px); border-color: rgba(124, 96, 245, 0.45); }
.skill-group h3 {
  font-family: var(--font-head);
  font-size: 1.12rem;
  margin-bottom: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}
.skill-chips { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.chip {
  padding: 0.45rem 1rem;
  border-radius: 999px;
  font-size: 0.86rem;
  font-weight: 500;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  transition: all 0.25s ease;
  cursor: default;
}
.chip:hover {
  background: var(--gradient);
  color: #fff;
  transform: translateY(-2px);
  border-color: transparent;
}

/* ============================================================
   SERVICES
   ============================================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}
.service-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.7rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
}
.service-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.service-card:hover { transform: translateY(-7px); box-shadow: var(--shadow); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon { font-size: 2.2rem; margin-bottom: 1rem; }
.service-card h3 {
  font-family: var(--font-head);
  font-size: 1.1rem;
  margin-bottom: 0.6rem;
}
.service-card p { color: var(--text-muted); font-size: 0.93rem; }

/* ============================================================
   PROJECTS
   ============================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.6rem;
}
.project-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
  border-color: rgba(124, 96, 245, 0.5);
}
.project-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.1rem;
}
.folder-icon { font-size: 1.9rem; }
.project-links { display: flex; align-items: center; gap: 0.8rem; }
.project-links a { color: var(--text-muted); transition: color 0.25s, transform 0.25s; }
.project-links a:hover { color: var(--primary-2); transform: scale(1.15); }
.project-links svg { width: 21px; height: 21px; }
.star-badge {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: rgba(250, 204, 21, 0.12);
  border: 1px solid rgba(250, 204, 21, 0.3);
  color: #eab308;
}
.project-card h3 {
  font-family: var(--font-head);
  font-size: 1.18rem;
  margin-bottom: 0.6rem;
}
.project-card > p {
  color: var(--text-muted);
  font-size: 0.93rem;
  flex-grow: 1;
  margin-bottom: 1.2rem;
}
.project-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.project-tags span {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

/* ============================================================
   ACHIEVEMENTS
   ============================================================ */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.4rem;
}
.cert-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.7rem;
  text-align: center;
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.cert-card:hover { transform: translateY(-6px); border-color: rgba(34, 211, 238, 0.45); }
.cert-icon { font-size: 2rem; margin-bottom: 0.8rem; }
.cert-card h3 { font-family: var(--font-head); font-size: 1.05rem; margin-bottom: 0.4rem; }
.cert-card p { color: var(--text-muted); font-size: 0.88rem; }

/* ============================================================
   GITHUB
   ============================================================ */
.github-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}
.github-stats img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 0.6rem;
  max-width: 100%;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.4rem;
}
.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.9rem 1.5rem;
  text-align: center;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.contact-card:hover {
  transform: translateY(-6px);
  border-color: rgba(124, 96, 245, 0.5);
  box-shadow: var(--shadow);
}
.contact-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  margin: 0 auto 1rem;
  border-radius: 16px;
  background: var(--gradient-soft);
  color: var(--primary-2);
}
.contact-icon svg { width: 25px; height: 25px; }
.contact-card h3 { font-family: var(--font-head); font-size: 1.05rem; margin-bottom: 0.3rem; }
.contact-card p { color: var(--text-muted); font-size: 0.9rem; word-break: break-word; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 2.2rem 0;
  background: var(--bg-alt);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
  flex-wrap: wrap;
}
.footer p { color: var(--text-muted); font-size: 0.9rem; }
.footer-socials { display: flex; gap: 0.8rem; }
.footer-socials a {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: all 0.25s;
}
.footer-socials a:hover { color: #fff; background: var(--gradient); border-color: transparent; }
.footer-socials svg { width: 17px; height: 17px; }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  bottom: 26px;
  right: 26px;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  border: none;
  background: var(--gradient);
  color: #fff;
  display: grid;
  place-items: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 0.3s, transform 0.3s;
  box-shadow: 0 10px 26px rgba(124, 96, 245, 0.4);
  z-index: 900;
}
.back-to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top svg { width: 20px; height: 20px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 960px) {
  .edu-grid { grid-template-columns: 1fr; }
  .hero-content { grid-template-columns: 1fr; text-align: center; gap: 3.5rem; }
  .hero-text { order: 2; }
  .hero-visual { order: 1; }
  .hero-desc { margin-inline: auto; }
  .hero-cta, .hero-socials { justify-content: center; }
  .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .skills-groups { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    background: color-mix(in srgb, var(--bg) 92%, transparent);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 1.2rem 0 1.6rem;
    transform: translateY(-130%);
    transition: transform 0.35s ease;
  }
  .nav-links.open { transform: translateY(0); }
  .hamburger { display: flex; }
  .section { padding: 4.5rem 0; }
  .timeline { padding-left: 1.7rem; }
  .timeline-dot { left: -1.7rem; }
  .timeline-card { padding: 1.4rem; }
  .floating-badge { font-size: 0.78rem; padding: 0.45rem 0.8rem; }
  .about-facts { grid-template-columns: 1fr; }
  .footer-inner { justify-content: center; text-align: center; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 0.8rem; }
  .stat-number, .stat-plus { font-size: 1.7rem; }
  .btn { padding: 0.75rem 1.3rem; font-size: 0.88rem; }
}

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