/* ============================================================
   Personal Portfolio — style.css
   ------------------------------------------------------------
   WANT A DIFFERENT COLOUR SCHEME? Edit the CSS variables in
   :root (dark theme) and [data-theme="light"] below — nothing
   else needs to change.
   ============================================================ */

/* ---------- Design tokens (dark theme, default) ---------- */
:root {
  --bg: #0a0e1a;
  --bg-soft: #0d1326;
  --bg-alt: #0f1526;
  --card: #121a30;
  --card-border: rgba(148, 163, 196, 0.14);
  --text: #e6ecff;
  --muted: #94a3c4;
  --accent: #22d3ee;
  --accent-2: #a78bfa;
  --accent-soft: rgba(34, 211, 238, 0.12);
  --gradient: linear-gradient(135deg, #22d3ee 0%, #a78bfa 100%);
  --success: #34d399;
  --error: #f87171;

  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-heading: "Space Grotesk", var(--font-body);
  --font-mono: "JetBrains Mono", "Fira Code", Consolas, monospace;

  --radius: 14px;
  --radius-sm: 8px;
  --nav-height: 72px;
  --shadow: 0 18px 40px -18px rgba(2, 6, 23, 0.65);
  --transition: 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Light theme ---------- */
[data-theme="light"] {
  --bg: #f5f7ff;
  --bg-soft: #eef1fc;
  --bg-alt: #ffffff;
  --card: #ffffff;
  --card-border: rgba(30, 41, 82, 0.12);
  --text: #131a33;
  --muted: #5a6784;
  --accent: #0891b2;
  --accent-2: #7c3aed;
  --accent-soft: rgba(8, 145, 178, 0.1);
  --shadow: 0 18px 40px -22px rgba(30, 41, 82, 0.25);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 12px);
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  transition: background 0.35s ease, color 0.35s ease;
}

/* Subtle ambient glow behind the page */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(55rem 30rem at 85% -10%, rgba(167, 139, 250, 0.14), transparent 60%),
    radial-gradient(50rem 28rem at -10% 30%, rgba(34, 211, 238, 0.1), transparent 60%);
  pointer-events: none;
  z-index: -2;
}

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

::selection { background: rgba(34, 211, 238, 0.35); }

/* Custom scrollbar (WebKit) */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-soft); }
::-webkit-scrollbar-thumb { background: linear-gradient(var(--accent), var(--accent-2)); border-radius: 99px; }

/* ---------- Utilities ---------- */
.container { width: min(1120px, 92%) ; margin-inline: auto; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}

.skip-link {
  position: fixed; top: -100px; left: 16px; z-index: 200;
  padding: 10px 16px; border-radius: var(--radius-sm);
  background: var(--accent); color: #04121a; font-weight: 600;
  transition: top var(--transition);
}
.skip-link:focus { top: 12px; }

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

.link {
  color: var(--accent);
  font-weight: 500;
  border-bottom: 1px dashed transparent;
  transition: border-color var(--transition);
}
.link:hover { border-bottom-color: var(--accent); }

.icon { width: 22px; height: 22px; }

/* ---------- Scroll progress bar ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; right: 0;
  height: 3px; z-index: 120; pointer-events: none;
}
.scroll-progress span {
  display: block; height: 100%; width: 0%;
  background: var(--gradient);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.7);
}

/* ---------- Particles canvas ---------- */
#particles {
  position: fixed; inset: 0; z-index: -1;
  width: 100%; height: 100%;
  pointer-events: none;
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-height);
  transition: background var(--transition), box-shadow var(--transition),
              backdrop-filter var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--card-border);
  box-shadow: 0 10px 30px -18px rgba(2, 6, 23, 0.6);
}

.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%; gap: 16px;
}

.nav-logo {
  font-family: var(--font-mono); font-size: 1.15rem; font-weight: 600;
  letter-spacing: 0.5px;
}
.nav-logo-mark {
  background: var(--gradient);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  margin-right: 4px;
}

.nav-links {
  display: flex; align-items: center; gap: 6px;
}
.nav-link {
  position: relative;
  padding: 8px 12px; border-radius: var(--radius-sm);
  font-size: 0.95rem; color: var(--muted);
  transition: color var(--transition);
}
.nav-link:hover { color: var(--text); }
.nav-link.active { color: var(--text); }
.nav-num {
  font-family: var(--font-mono); font-size: 0.75em;
  color: var(--accent); margin-right: 5px;
}
.nav-link::after {
  content: "";
  position: absolute; left: 12px; right: 12px; bottom: 3px;
  height: 2px; border-radius: 2px;
  background: var(--gradient);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--transition);
}
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); }

.nav-cta { margin-left: 10px; }

.nav-actions { display: flex; align-items: center; gap: 8px; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 42px; height: 42px; border-radius: 12px;
  border: 1px solid var(--card-border);
  color: var(--muted);
  background: color-mix(in srgb, var(--card) 55%, transparent);
  transition: color var(--transition), border-color var(--transition),
              transform var(--transition);
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); }

/* Theme toggle icon swap */
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }
[data-theme="light"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: none; }

/* Hamburger (mobile) */
.nav-toggle { display: none; }
.hamburger { display: flex; flex-direction: column; gap: 5px; }
.hamburger span {
  width: 20px; height: 2px; border-radius: 2px;
  background: currentColor; transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle[aria-expanded="true"] .hamburger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .hamburger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 12px;
  font-weight: 600; font-size: 0.95rem; letter-spacing: 0.2px;
  border: 1px solid transparent;
  transition: transform var(--transition), box-shadow var(--transition),
              background var(--transition), border-color var(--transition), color var(--transition);
}
.btn:active { transform: scale(0.97); }
.btn-sm { padding: 9px 18px; font-size: 0.85rem; }
.btn-block { width: 100%; }

.btn-primary {
  background: var(--gradient);
  color: #071018;
  box-shadow: 0 12px 28px -12px rgba(34, 211, 238, 0.55);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 34px -12px rgba(34, 211, 238, 0.65);
}

.btn-outline {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}
.btn-outline:hover {
  transform: translateY(-3px);
  background: var(--accent); color: #071018;
}

/* ---------- Sections ---------- */
.section { padding: 110px 0; position: relative; }
.section-alt { background: var(--bg-alt); border-block: 1px solid var(--card-border); }

.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
  display: block;
  font-family: var(--font-mono); font-size: 0.95rem;
  color: var(--accent); margin-bottom: 10px;
}
.section-title {
  font-family: var(--font-heading); font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1.2; letter-spacing: -0.5px;
}
.section-sub {
  max-width: 620px; margin: 14px auto 0;
  color: var(--muted); font-size: 1.02rem;
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: calc(var(--nav-height) + 40px) 0 60px;
  position: relative;
}

.hero-grid {
  display: grid; grid-template-columns: 1.1fr 0.9fr;
  align-items: center; gap: 48px;
}

.hero-hello {
  font-family: var(--font-mono); color: var(--accent);
  font-size: 1.05rem; margin-bottom: 14px;
}
.wave { display: inline-block; animation: wave 2.6s 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); } }

.hero-name {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.1; letter-spacing: -1px;
  margin-bottom: 10px;
}

.hero-role {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3.4vw, 2.1rem);
  color: var(--muted); font-weight: 500;
  min-height: 1.4em; margin-bottom: 20px;
}
.typed { color: var(--text); }
.caret {
  display: inline-block; width: 3px;
  background: var(--accent);
  animation: blink 0.85s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-blurb { max-width: 520px; color: var(--muted); margin-bottom: 30px; font-size: 1.05rem; }
.hero-blurb strong { color: var(--text); }

.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 30px; }

.socials { display: flex; gap: 10px; }
.socials a {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 12px;
  border: 1px solid var(--card-border);
  color: var(--muted); background: color-mix(in srgb, var(--card) 55%, transparent);
  transition: color var(--transition), border-color var(--transition),
              transform var(--transition), box-shadow var(--transition);
}
.socials a:hover {
  color: var(--accent); border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 14px 26px -14px rgba(34, 211, 238, 0.5);
}

/* Code window card */
.hero-card { position: relative; }
.code-window {
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--card) 88%, transparent);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
  overflow: hidden;
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.code-titlebar {
  display: flex; align-items: center; gap: 7px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--card-border);
  background: color-mix(in srgb, var(--bg-soft) 70%, transparent);
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot-red { background: #ff5f57; } .dot-yellow { background: #febc2e; } .dot-green { background: #28c840; }
.code-filename {
  margin-left: 8px;
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--muted);
}

.code-body {
  padding: 20px 22px;
  font-family: var(--font-mono); font-size: 0.86rem; line-height: 1.75;
  overflow-x: auto;
  tab-size: 2;
}
.tok-kw { color: #c792ea; }        /* keyword  */
.tok-var { color: #82aaff; }       /* variable */
.tok-str { color: #c3e88d; }       /* string   */
.tok-cmt { color: #63709a; font-style: italic; } /* comment */
[data-theme="light"] .tok-kw { color: #7c3aed; }
[data-theme="light"] .tok-var { color: #2563eb; }
[data-theme="light"] .tok-str { color: #0f766e; }
[data-theme="light"] .tok-cmt { color: #94a3b8; }

.float-badge {
  position: absolute;
  padding: 10px 16px; border-radius: 12px;
  background: color-mix(in srgb, var(--card) 92%, transparent);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
  font-size: 0.85rem; font-weight: 600;
  animation: float 5s ease-in-out infinite;
}
.badge-top { top: -22px; right: -8px; animation-delay: -1.4s; }
.badge-bottom { bottom: -20px; left: -14px; animation-delay: -2.8s; }

/* Scroll hint */
.scroll-hint {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: 0.72rem;
  letter-spacing: 3px; text-transform: uppercase;
  color: var(--muted);
  transition: color var(--transition);
}
.scroll-hint:hover { color: var(--accent); }
.mouse {
  width: 24px; height: 38px;
  border: 2px solid currentColor; border-radius: 14px;
  display: flex; justify-content: center; padding-top: 6px;
}
.wheel {
  width: 3px; height: 7px; border-radius: 3px;
  background: currentColor;
  animation: wheel 1.6s ease-in-out infinite;
}
@keyframes wheel { 0% { transform: translateY(0); opacity: 1; } 70% { transform: translateY(9px); opacity: 0; } 100% { opacity: 0; } }

/* ---------- About ---------- */
.about-grid {
  display: grid; grid-template-columns: 320px 1fr;
  gap: 56px; align-items: start;
}

.avatar-frame {
  position: relative; border-radius: 20px; overflow: hidden;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
  transition: transform var(--transition);
}
.avatar-frame:hover { transform: scale(1.02) rotate(-1deg); }
.avatar-frame::after {  /* shine sweep */
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(115deg, transparent 30%, rgba(255, 255, 255, 0.18) 48%, transparent 62%);
  transform: translateX(-120%);
  transition: transform 0.9s ease;
}
.avatar-frame:hover::after { transform: translateX(120%); }

.about-text p { color: var(--muted); margin-bottom: 16px; font-size: 1.03rem; }
.about-text strong { color: var(--text); }

.facts {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 12px 24px;
  margin: 26px 0;
}
.facts li {
  display: flex; flex-direction: column; gap: 2px;
  padding: 12px 16px; border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--card) 70%, transparent);
  border: 1px solid var(--card-border);
  font-size: 0.95rem;
}
.fact-label {
  font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--accent); letter-spacing: 0.4px;
}

.skills { display: grid; gap: 18px; }
.skill-title {
  font-family: var(--font-mono); font-size: 0.85rem;
  color: var(--muted); text-transform: uppercase; letter-spacing: 1px;
  margin-bottom: 10px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 6px 14px; border-radius: 999px;
  font-size: 0.82rem; font-weight: 500;
  font-family: var(--font-mono);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  color: var(--text);
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}
.chip:hover { transform: translateY(-2px); border-color: var(--accent); }
.chips-sm .chip { padding: 4px 11px; font-size: 0.74rem; }

/* Stats */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 18px; margin-top: 70px;
}
.stat {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 26px 12px; border-radius: var(--radius);
  background: color-mix(in srgb, var(--card) 75%, transparent);
  border: 1px solid var(--card-border);
  transition: transform var(--transition), border-color var(--transition);
}
.stat:hover { transform: translateY(-5px); border-color: var(--accent); }
.stat-num {
  font-family: var(--font-heading);
  font-size: clamp(1.7rem, 3.2vw, 2.3rem); font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.stat-label { color: var(--muted); font-size: 0.9rem; }

/* ---------- Projects ---------- */
.filters {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 10px; margin-bottom: 42px;
}
.filter-btn {
  padding: 9px 20px; border-radius: 999px;
  font-size: 0.88rem; font-weight: 600;
  color: var(--muted);
  border: 1px solid var(--card-border);
  background: color-mix(in srgb, var(--card) 60%, transparent);
  transition: all var(--transition);
}
.filter-btn:hover { color: var(--text); border-color: var(--accent); }
.filter-btn.active {
  background: var(--gradient); color: #071018; border-color: transparent;
  box-shadow: 0 10px 22px -10px rgba(34, 211, 238, 0.55);
}

.projects-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  display: flex; flex-direction: column;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--card) 85%, transparent);
  border: 1px solid var(--card-border);
  overflow: hidden;
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease, opacity var(--transition);
  will-change: transform;
}
.project-card:hover {
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
  box-shadow: 0 24px 48px -20px rgba(2, 6, 23, 0.7);
}
.project-card.hidden-card { display: none; }

/* Each banner has its own gradient — customise freely */
.banner-1 { background: linear-gradient(135deg, #164e63, #22d3ee); }
.banner-2 { background: linear-gradient(135deg, #4c1d95, #a78bfa); }
.banner-3 { background: linear-gradient(135deg, #14532d, #34d399); }
.banner-4 { background: linear-gradient(135deg, #7c2d12, #fb923c); }
.banner-5 { background: linear-gradient(135deg, #831843, #f472b6); }
.banner-6 { background: linear-gradient(135deg, #1e3a8a, #60a5fa); }

.project-banner {
  height: 130px;
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem;
  filter: saturate(1.05);
}
.project-banner span { transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1); }
.project-card:hover .project-banner span { transform: scale(1.25) rotate(-8deg); }

.project-body {
  display: flex; flex-direction: column; flex: 1;
  padding: 22px; gap: 12px;
}
.project-top { display: flex; justify-content: space-between; align-items: center; }
.project-folder { color: var(--accent); }
.project-links { display: flex; gap: 6px; }
.project-links a {
  padding: 7px; border-radius: 9px;
  color: var(--muted);
  transition: color var(--transition), background var(--transition), transform var(--transition);
}
.project-links a:hover { color: var(--accent); background: var(--accent-soft); transform: translateY(-2px); }

.project-title { font-family: var(--font-heading); font-size: 1.18rem; letter-spacing: -0.2px; }
.project-desc { color: var(--muted); font-size: 0.93rem; flex: 1; }

.projects-more { text-align: center; margin-top: 44px; color: var(--muted); }

/* ---------- Hobbies ---------- */
.hobbies-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.hobby-card {
  padding: 30px 26px;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--card) 75%, transparent);
  border: 1px solid var(--card-border);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  position: relative; overflow: hidden;
}
.hobby-card::before {  /* top accent line grows on hover */
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient);
  transform: scaleX(0); transform-origin: center;
  transition: transform 0.4s ease;
}
.hobby-card:hover {
  transform: translateY(-6px);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  box-shadow: var(--shadow);
}
.hobby-card:hover::before { transform: scaleX(1); }

.hobby-icon {
  font-size: 2.3rem;
  width: 68px; height: 68px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 18px;
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  margin-bottom: 18px;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.hobby-card:hover .hobby-icon { transform: scale(1.12) rotate(-6deg); }

.hobby-card h3 { font-family: var(--font-heading); font-size: 1.12rem; margin-bottom: 8px; }
.hobby-card p { color: var(--muted); font-size: 0.93rem; }

/* ---------- Contact ---------- */
.contact-grid {
  display: grid; grid-template-columns: 0.85fr 1.15fr;
  gap: 44px; align-items: start;
}

.contact-info { display: grid; gap: 16px; }
.contact-item {
  display: flex; gap: 16px; align-items: center;
  padding: 18px 20px;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--card) 75%, transparent);
  border: 1px solid var(--card-border);
  transition: transform var(--transition), border-color var(--transition);
}
.contact-item:hover { transform: translateX(6px); border-color: var(--accent); }
.contact-icon {
  flex-shrink: 0;
  width: 50px; height: 50px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.contact-item h3 { font-size: 0.95rem; font-family: var(--font-heading); }
.contact-item p, .contact-item a { color: var(--muted); font-size: 0.93rem; }

.contact-socials { display: flex; gap: 10px; margin-top: 6px; padding-left: 6px; }
.contact-socials a {
  display: inline-flex; align-items: center; justify-content: center;
  width: 46px; height: 46px; border-radius: 13px;
  color: var(--muted);
  border: 1px solid var(--card-border);
  background: color-mix(in srgb, var(--card) 75%, transparent);
  transition: all var(--transition);
}
.contact-socials a:hover {
  color: var(--accent); border-color: var(--accent);
  transform: translateY(-4px);
}

/* Form */
.contact-form {
  padding: 30px;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--card) 85%, transparent);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-field { display: flex; flex-direction: column; gap: 7px; margin-bottom: 18px; }
.form-field label { font-size: 0.9rem; font-weight: 600; }
.req { color: var(--error); }

.form-field input,
.form-field textarea {
  font: inherit; color: var(--text);
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--card-border);
  background: var(--bg-soft);
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: color-mix(in srgb, var(--muted) 75%, transparent); }
.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent);
}
.form-field.invalid input,
.form-field.invalid textarea { border-color: var(--error); }

.error-msg { font-size: 0.8rem; color: var(--error); min-height: 1em; }

.form-note { margin-top: 14px; text-align: center; font-size: 0.8rem; color: var(--muted); }

/* ---------- Footer ---------- */
.footer {
  padding: 26px 0;
  border-top: 1px solid var(--card-border);
  background: var(--bg-soft);
}
.footer-grid {
  display: flex; flex-wrap: wrap; justify-content: space-between;
  align-items: center; gap: 8px;
  color: var(--muted); font-size: 0.9rem;
}
.footer-meta { font-family: var(--font-mono); font-size: 0.82rem; }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  opacity: 0; visibility: hidden; transform: translateY(14px);
  background: var(--gradient); color: #071018; border: none;
  box-shadow: 0 14px 30px -10px rgba(34, 211, 238, 0.6);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { color: #071018; transform: translateY(-4px); }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 30px; z-index: 150;
  transform: translate(-50%, 140%);
  max-width: min(92vw, 480px);
  padding: 14px 22px; border-radius: 12px;
  background: var(--card);
  border: 1px solid var(--accent);
  box-shadow: var(--shadow);
  font-size: 0.92rem; text-align: center;
  transition: transform 0.45s cubic-bezier(0.34, 1.3, 0.64, 1);
}
.toast.show { transform: translate(-50%, 0); }
.toast.toast-error { border-color: var(--error); }

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

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 60px; }
  .hero-card { max-width: 560px; margin-inline: auto; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-photo { max-width: 300px; margin-inline: auto; }
  .projects-grid, .hobbies-grid { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .section { padding: 80px 0; }

  /* Mobile nav drawer */
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: fixed; top: var(--nav-height); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 4px;
    padding: 18px 6vw 26px;
    background: color-mix(in srgb, var(--bg) 96%, transparent);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--card-border);
    transform: translateY(-16px); opacity: 0; visibility: hidden;
    transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
  }
  .nav-links.open { transform: translateY(0); opacity: 1; visibility: visible; }
  .nav-link { padding: 13px 14px; font-size: 1.02rem; }
  .nav-cta { margin: 10px 0 0; justify-content: center; }
  .nav-cta:hover { transform: none; }

  .form-row { grid-template-columns: 1fr; }
  .projects-grid, .hobbies-grid { grid-template-columns: 1fr; }
  .float-badge { display: none; }
  .scroll-hint { display: none; }
  .facts { grid-template-columns: 1fr; }
}

@media (max-width: 420px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .hero-cta .btn { flex: 1; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }
  .reveal { opacity: 1; transform: none; }
}