/* ========================================================================
   Tharun Sridhar, Portfolio
   ======================================================================== */

:root {
  --bg: #f6f7fb;
  --bg-alt: #eef0f7;
  --surface: #ffffff;
  --surface-2: #f1f2f8;
  --border: #e2e4ee;
  --text: #12131c;
  --text-muted: #55586b;
  --text-faint: #8688a0;
  --accent: #0ea5e9;
  --accent-2: #2563eb;
  --accent-contrast: #ffffff;
  --shadow: 0 20px 40px -20px rgba(20, 20, 40, 0.18);
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Space Grotesk', var(--font-sans);
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a0b10;
    --bg-alt: #0e1017;
    --surface: #12141c;
    --surface-2: #171a24;
    --border: #262a38;
    --text: #eef0fb;
    --text-muted: #a6a9bf;
    --text-faint: #6d7089;
    --accent: #38bdf8;
    --accent-2: #60a5fa;
    --accent-contrast: #06110f;
    --shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0a0b10;
  --bg-alt: #0e1017;
  --surface: #12141c;
  --surface-2: #171a24;
  --border: #262a38;
  --text: #eef0fb;
  --text-muted: #a6a9bf;
  --text-faint: #6d7089;
  --accent: #38bdf8;
  --accent-2: #60a5fa;
  --accent-contrast: #06110f;
  --shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

/* ---------- Theme 2: black / burgundy / white (opt-in via ?palette=2) ---------- */
:root[data-palette="2"] {
  --bg: #ffffff;
  --bg-alt: #f7f1f2;
  --surface: #ffffff;
  --surface-2: #f4ecee;
  --border: #e6d6da;
  --text: #000000;
  --text-muted: #3a3a3a;
  --text-faint: #7a7a7a;
  --accent: #6d001a;
  --accent-2: #000000;
  --accent-contrast: #ffffff;
  --shadow: 0 20px 40px -20px rgba(109, 0, 26, 0.28);
  color-scheme: light;
}
:root[data-palette="2"] .theme-toggle { display: none !important; }
:root[data-palette="2"] .terminal-window { background: #000000; border-color: #000000; }
:root[data-palette="2"] .terminal-bar { background: #1a1a1a; border-bottom-color: #2a2a2a; }
:root[data-palette="2"] .terminal-body .prompt,
:root[data-palette="2"] .cursor-blink { color: #ffffff; }
:root[data-palette="2"] .terminal-body .out { color: #d6d6d6; }
:root[data-palette="2"] .terminal-body .out.accent { color: #e8a3b3; }

/* ---------- Theme 3: black / purple / white (opt-in via ?palette=3) ---------- */
:root[data-palette="3"] {
  --bg: #000000;
  --bg-alt: #07040b;
  --surface: #0c0712;
  --surface-2: #130b1c;
  --border: #2a1a3a;
  --text: #ffffff;
  --text-muted: #c9c9d1;
  --text-faint: #8a8a96;
  --accent: #ac58e9;
  --accent-2: #ffffff;
  --accent-contrast: #000000;
  --shadow: 0 20px 50px -20px rgba(172, 88, 233, 0.35);
  color-scheme: dark;
}
:root[data-palette="3"] .theme-toggle { display: none !important; }
:root[data-palette="3"] .terminal-window { background: #000000; border-color: var(--border); }
:root[data-palette="3"] .terminal-bar { background: #0c0712; border-bottom-color: var(--border); }
:root[data-palette="3"] .terminal-body .prompt,
:root[data-palette="3"] .cursor-blink { color: #ac58e9; }
:root[data-palette="3"] .terminal-body .out { color: #ffffff; }
:root[data-palette="3"] .terminal-body .out.accent { color: #ac58e9; }

/* ---------- Theme 4: black / violet / lime (opt-in via ?palette=4) ---------- */
:root[data-palette="4"] {
  --bg: #000000;
  --bg-alt: #060409;
  --surface: #0b0912;
  --surface-2: #120e1d;
  --border: #261b3d;
  --text: #ffffff;
  --text-muted: #c9c9d1;
  --text-faint: #8a8a96;
  --accent: #a3e635;
  --accent-2: #7c3aed;
  --accent-contrast: #000000;
  --shadow: 0 20px 50px -20px rgba(124, 58, 237, 0.4);
  color-scheme: dark;
}
:root[data-palette="4"] .theme-toggle { display: none !important; }
:root[data-palette="4"] .btn-primary { background: var(--accent); }
:root[data-palette="4"] .terminal-window { background: #000000; border-color: var(--border); }
:root[data-palette="4"] .terminal-bar { background: #0b0912; border-bottom-color: var(--border); }
:root[data-palette="4"] .terminal-body .prompt,
:root[data-palette="4"] .cursor-blink { color: #a3e635; }
:root[data-palette="4"] .terminal-body .out { color: #ffffff; }
:root[data-palette="4"] .terminal-body .out.accent { color: #a78bfa; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

/* Desktop renders at the 90% scale that looks right, so 100% browser zoom matches it */
@media (min-width: 1024px) { html { zoom: 0.9; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
svg { width: 1.1em; height: 1.1em; }

.container {
  width: min(1180px, 92%);
  margin-inline: auto;
}

::selection { background: var(--accent); color: var(--accent-contrast); }

/* ---------- cursor glow (desktop only) ---------- */
.cursor-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(600px circle at var(--x, 50%) var(--y, 50%), color-mix(in srgb, var(--accent) 8%, transparent), transparent 60%);
  transition: background 0.15s ease;
}
@media (max-width: 900px) { .cursor-glow { display: none; } }

/* ========================= NAV ========================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.nav.scrolled { border-bottom-color: var(--border); }

.nav-inner {
  width: min(1180px, 92%);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
}
.nav-logo .dot { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 1.6rem;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
}
.nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 0.3rem 0;
  transition: color 0.2s ease;
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width 0.25s ease;
}
.nav-link:hover, .nav-link.active { color: var(--text); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: 0.7rem; }

.theme-toggle {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  display: grid;
  place-items: center;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.theme-toggle:hover { border-color: var(--accent); transform: rotate(15deg); }
.theme-toggle svg { width: 18px; height: 18px; }
.icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun,
@media (prefers-color-scheme: dark) { }
:root[data-theme="dark"] .icon-moon { display: block; }
:root[data-theme="dark"] .icon-sun { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-moon { display: block; }
  :root:not([data-theme="light"]) .icon-sun { display: none; }
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px; height: 38px;
  background: none;
  border: none;
}
.menu-toggle span {
  width: 20px; height: 2px;
  background: var(--text);
  margin-inline: auto;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ========================= BUTTONS ========================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-contrast);
  box-shadow: 0 10px 30px -10px color-mix(in srgb, var(--accent) 60%, transparent);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 34px -8px color-mix(in srgb, var(--accent) 70%, transparent); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn-sm { padding: 0.5rem 1.1rem; font-size: 0.85rem; }
.btn-lg { padding: 1rem 2.2rem; font-size: 1rem; }
.resume-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2.5rem;
}

/* ========================= HERO ========================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  overflow: hidden;
}
.hero-bg { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.16;
}
.glow-1 { width: 480px; height: 480px; background: var(--accent); top: -120px; right: -80px; }
.glow-2 { width: 420px; height: 420px; background: var(--accent-2); bottom: -140px; left: -100px; }

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 3rem;
  padding-block: 4rem;
}

.eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  margin: 0 0 0.6rem;
}
.hero-name {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5.5vw, 4.4rem);
  font-weight: 700;
  line-height: 1.03;
  letter-spacing: -0.02em;
  margin: 0 0 1.4rem;
}
.hero-name .accent { color: var(--accent); }

@keyframes blink { 50% { opacity: 0; } }

.hero-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 56ch;
  margin-bottom: 2.2rem;
}

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

.hero-social { display: flex; gap: 0.9rem; }
.hero-social a {
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  color: var(--text-muted);
  transition: all 0.25s ease;
}
.hero-social a:hover {
  color: var(--accent-contrast);
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-3px);
}

.hero-photo { position: relative; justify-self: center; }
.photo-ring {
  width: min(360px, 80vw);
  aspect-ratio: 1;
  border-radius: 34% 66% 62% 38% / 42% 38% 62% 58%;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  animation: morph 10s ease-in-out infinite;
  position: relative;
}
.photo-ring::before {
  content: '';
  position: absolute;
  inset: -3px;
  z-index: -1;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.photo-ring img { width: 100%; height: 100%; object-fit: cover; }
@keyframes morph {
  0%, 100% { border-radius: 34% 66% 62% 38% / 42% 38% 62% 58%; }
  50% { border-radius: 62% 38% 38% 62% / 58% 62% 38% 42%; }
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem;
  margin-top: 1.4rem;
}
.badge-float {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.55rem 1.1rem;
  font-size: 0.82rem;
  font-weight: 600;
  box-shadow: var(--shadow);
  animation: float 5s ease-in-out infinite;
  white-space: nowrap;
}
.badge-1 { animation-delay: 0s; }
.badge-3 { animation-delay: 0.75s; }
.badge-2 { animation-delay: 1.5s; }
.badge-4 { animation-delay: 2.25s; cursor: pointer; }
.badge-4:hover { border-color: var(--accent); color: var(--accent); }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }

.scroll-cue {
  position: absolute;
  bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 2px solid var(--border);
  border-radius: 20px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
  z-index: 1;
}
.scroll-cue span {
  width: 4px; height: 8px;
  border-radius: 2px;
  background: var(--accent);
  animation: scrollcue 1.6s ease infinite;
}
@keyframes scrollcue { 0% { opacity: 1; transform: translateY(0); } 100% { opacity: 0; transform: translateY(14px); } }

/* ========================= SECTIONS ========================= */
.section { padding: 7rem 0; position: relative; }
.section-alt { background: color-mix(in srgb, var(--bg-alt) 45%, transparent); }
.section-kicker {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  margin: 0 0 0.6rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
}
.section-sub {
  color: var(--text-muted);
  max-width: 62ch;
  margin: -1.6rem 0 3rem;
  font-size: 0.98rem;
}
.section-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem;
  margin-bottom: 1rem;
}
.section-header-row .section-title { margin-bottom: 0; }

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.9fr;
  gap: 3rem;
  align-items: start;
}
.about-text p { color: var(--text-muted); margin-bottom: 1.2rem; }
.about-facts {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.6rem 2rem;
}
.fact { display: flex; flex-direction: column; gap: 0.35rem; }
.fact-label { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.05em; }
.fact-value { font-weight: 600; font-size: 0.95rem; line-height: 1.5; }

.about-terminal { position: sticky; top: 100px; }
.terminal-window {
  background: #0d0e14;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.7rem 1rem;
  background: #14151d;
  border-bottom: 1px solid #23242f;
}
.terminal-bar .dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }
.terminal-title {
  margin-left: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #6d7089;
}
.terminal-body { padding: 1.3rem 1.2rem; font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.75; }
.terminal-body p { margin: 0; }
.terminal-body .prompt { color: #2dd4c4; margin-right: 0.5ch; }
.terminal-body .out { color: #a6a9bf; padding-left: 1.6ch; margin-bottom: 0.55rem; }
.terminal-body .out.accent { color: #8b7bff; }
.cursor-blink { color: #2dd4c4; animation: blink 0.9s steps(1) infinite; }

@media (max-width: 980px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-terminal { position: static; max-width: 480px; margin-inline: auto; }
}

/* ---------- Skills ---------- */
.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.6rem;
}
.skill-card-full { padding: 2rem; }
.skill-lines { display: flex; flex-direction: column; gap: 0.75rem; }
.skill-line {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.6;
}
.skill-line-label {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
}
.skill-line-label::after { content: ": "; color: var(--accent); }
.skill-line-value { color: var(--text-muted); }

.tag-row { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ---------- Projects ---------- */
.filter-row {
  display: flex;
  gap: 0.7rem;
  margin-bottom: 2.6rem;
  flex-wrap: wrap;
}
.filter-btn {
  padding: 0.55rem 1.3rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.85rem;
  transition: all 0.2s ease;
}
.filter-btn:hover { border-color: var(--accent); color: var(--text); }
.filter-btn.active { background: var(--accent); border-color: var(--accent); color: var(--accent-contrast); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.6rem;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  opacity: 0;
  transform: translateY(16px);
  animation: cardIn 0.5s ease forwards;
}
@keyframes cardIn { to { opacity: 1; transform: translateY(0); } }
.project-card:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: var(--shadow); }
.project-card.hidden { display: none; }

.project-top { margin-bottom: 0.9rem; }
.project-visual {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.8rem;
  margin-bottom: 1.1rem;
}
.project-visual svg { width: 100%; height: auto; display: block; }
.project-visual svg [data-drag] { cursor: grab; touch-action: none; user-select: none; }
.project-visual svg.dragging [data-drag] { cursor: grabbing; }
.project-title { font-family: var(--font-display); font-size: 1.2rem; font-weight: 700; margin: 0 0 0.3rem; }
.project-roles { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0 0 0.7rem; }
.role-badge { font-family: var(--font-mono); font-size: 0.68rem; font-weight: 600; padding: 0.22rem 0.6rem; border-radius: 999px; color: var(--accent); border: 1px solid var(--accent); background: transparent; }
.project-desc { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 1.1rem; flex-grow: 1; }
.project-desc ul { margin: 0; padding-left: 1.1rem; display: flex; flex-direction: column; gap: 0.4rem; }
.project-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 1.2rem; }
.project-tags .tag { font-size: 0.7rem; padding: 0.28rem 0.6rem; }
.project-links { display: flex; gap: 0.8rem; margin-top: auto; }
.project-links a {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: all 0.2s ease;
}
.project-links a:hover { border-color: var(--accent); color: var(--accent); }
.project-links svg { width: 14px; height: 14px; }

/* ---------- Accomplishments ---------- */
.accomplish-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1.6rem;
}
.accomplish-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
}
.accomplish-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.4rem; }
.accomplish-head h3 { margin: 0; font-family: var(--font-display); font-size: 1.15rem; display: flex; align-items: center; gap: 0.55rem; }
.accomplish-icon { display: inline-flex; width: 1.15em; height: 1.15em; color: var(--accent); flex-shrink: 0; }
.accomplish-icon svg { width: 100%; height: 100%; }
.accomplish-link { font-size: 0.8rem; font-weight: 600; color: var(--accent); }
.accomplish-link:hover { text-decoration: underline; }

.badge-chips { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-bottom: 1.5rem; }
.badge-chip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.9rem;
  border-radius: 10px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 0.82rem;
  font-weight: 600;
}
.badge-chip .stars { color: #f4b400; letter-spacing: -1px; font-size: 0.7rem; }

.cert-mini-list { display: flex; flex-direction: column; gap: 0.6rem; }
.cert-mini {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.9rem;
  border-radius: 8px;
  background: var(--surface-2);
  font-size: 0.82rem;
}
.cert-mini-name { font-weight: 600; }
.cert-mini-status { color: var(--accent); font-size: 0.72rem; font-family: var(--font-mono); text-transform: uppercase; }

.leetcode-card { display: flex; flex-direction: column; height: 100%; }
.leetcode-card .btn { justify-content: center; text-align: center; }
.leetcode-stats {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; flex-grow: 1; gap: 0.4rem; padding: 1.6rem 0; margin-bottom: 1.4rem;
  border-radius: var(--radius-lg); background: var(--surface-2);
}
.leetcode-solved-num {
  font-family: var(--font-display); font-size: 3.2rem; font-weight: 700; line-height: 1;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.leetcode-solved-num.hr-cert-title { font-size: 0.85rem; line-height: 1.3; }
.hr-cert-panel { justify-content: flex-start; text-align: left; flex-direction: row; flex-wrap: wrap; gap: 0.4rem 1.1rem; padding: 0 1.1rem; min-height: 2.207rem; flex-grow: 0; margin-bottom: 1rem; }
.leetcode-solved-label { font-size: 0.95rem; font-weight: 600; color: var(--text); }

/* ---------- Certifications ---------- */
.cert-group-block + .cert-group-block { margin-top: 2.4rem; }
.cert-group-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  margin: 0 0 1rem;
}
.certs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}
.certs-grid:last-of-type { margin-bottom: 0; }
.cert-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.3rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.cert-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.cert-icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent-2) 16%, transparent);
  display: grid;
  place-items: center;
  font-size: 1.2rem;
}
.cert-body { min-width: 0; }
.cert-name { font-weight: 700; font-size: 0.95rem; margin: 0 0 0.2rem; }
.cert-meta { color: var(--text-faint); font-size: 0.78rem; font-family: var(--font-mono); }
.cert-link {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
}
.cert-link:hover { text-decoration: underline; }

.cert-group-card {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: transform 0.25s ease, border-color 0.25s ease;
  overflow: hidden;
}
.cert-group-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.cert-group-trigger {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  margin: 0;
  background: none;
  border: none;
  border-radius: 0;
  cursor: pointer;
  font: inherit;
  color: inherit;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.3rem 1.5rem;
}
.cert-group-icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent-2) 16%, transparent);
  display: grid;
  place-items: center;
  color: var(--accent-2);
}
.cert-group-icon svg { width: 22px; height: 22px; }
.cert-group-info { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 0.2rem; }
.cert-group-name { font-weight: 700; font-size: 0.95rem; }
.cert-group-count { color: var(--text-faint); font-size: 0.78rem; font-family: var(--font-mono); }
.cert-modal-mainlink { color: var(--accent); font-weight: 600; }
.cert-modal-mainlink:hover { text-decoration: underline; }
.cert-group-arrow { color: var(--text-faint); font-size: 1rem; transition: transform 0.2s ease, color 0.2s ease; }
.cert-group-card:hover .cert-group-arrow { transform: translateX(4px); color: var(--accent); }
.cert-group-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.cert-group-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 0.9rem;
  border-radius: 8px;
  background: var(--surface-2);
  border: 1px solid transparent;
  font-size: 0.85rem;
  transition: border-color 0.2s ease;
}
.cert-group-item:hover { border-color: var(--accent); }
.cert-group-item-static { cursor: default; border-style: dashed; }
.cert-group-item-static:hover { border-color: var(--border); }
.cert-group-item-name { font-weight: 600; }
.cert-group-item-date { color: var(--text-faint); font-size: 0.74rem; font-family: var(--font-mono); white-space: nowrap; }
.cert-group-item-status {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  white-space: nowrap;
}
.cert-group-item-status.in-progress { color: #f4b400; background: color-mix(in srgb, #f4b400 16%, transparent); }

/* ---------- Certification group modal ---------- */
.cert-modal { display: none; }
.cert-modal.open { display: block; }
.cert-modal-backdrop {
  position: fixed; inset: 0;
  background: color-mix(in srgb, black 65%, transparent);
  backdrop-filter: blur(3px);
  z-index: 200;
}
.cert-modal-panel {
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: min(560px, calc(100vw - 2.4rem));
  max-height: min(680px, calc(100vh - 4rem));
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 1.8rem;
  z-index: 201;
}
.cert-modal-close {
  position: absolute;
  top: 1rem; right: 1.1rem;
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-muted);
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
}
.cert-modal-close:hover { border-color: var(--accent); color: var(--accent); }
.cert-modal-head { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.4rem; padding-right: 2rem; }
.cert-modal-title { font-family: var(--font-display); font-size: 1.15rem; margin: 0 0 0.2rem; }

/* ---------- Contact ---------- */
.contact-section { text-align: center; }
.contact-section .section-title,
.contact-section .section-kicker { text-align: center; }
.contact-lead {
  color: var(--text-muted);
  max-width: 56ch;
  margin: 0 auto 3rem;
}
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  text-align: left;
  margin-bottom: 1rem;
}
.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.contact-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.contact-card-icon {
  width: 38px; height: 38px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
  display: grid;
  place-items: center;
}
.contact-card-label { font-size: 0.75rem; color: var(--text-faint); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.04em; }
.contact-card-value { font-weight: 600; font-size: 0.92rem; word-break: break-word; }

/* ========================= FOOTER ========================= */
.footer { border-top: 1px solid var(--border); padding: 2rem 0; }
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--text-faint);
  font-size: 0.85rem;
}
.back-to-top { font-weight: 600; color: var(--text-muted); transition: color 0.2s ease; }
.back-to-top:hover { color: var(--accent); }

/* ========================= REVEAL ANIMATION ========================= */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ========================= RESPONSIVE ========================= */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; padding-block: 6rem 3rem; }
  .hero-actions, .hero-social { justify-content: center; }
  .hero-photo { order: -1; }
  .projects-grid { grid-template-columns: 1fr; }
  .accomplish-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1.4rem 6%;
    gap: 1.2rem;
    transform: translateY(-140%);
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; }
  .menu-toggle { display: flex; }
  .btn.btn-sm.btn-primary { display: none; }
  .about-facts { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .accomplish-grid { grid-template-columns: 1fr; }
  .certs-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .section { padding: 4.5rem 0; }
  .nav-links { gap: 1rem; }
}

/* Resume picker: one button, choose AI or SDE */
.resume-menu { position: relative; }
.resume-menu-list {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 0.5rem);
  min-width: 11rem;
  padding: 0.35rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  z-index: 60;
}
.resume-menu.open .resume-menu-list { display: block; }
.resume-menu-list a {
  display: block;
  padding: 0.55rem 0.8rem;
  border-radius: 7px;
  color: inherit;
  text-decoration: none;
  white-space: nowrap;
}
.resume-menu-list a:hover, .resume-menu-list a:focus-visible { background: var(--surface-2); }
.resume-actions .resume-menu-list { left: 50%; right: auto; transform: translateX(-50%); }