/* ============================================================
   styles.css — Eddy Personal Portfolio
   Author: Eddy
   Description: Full stylesheet for enterprise developer portfolio.
                Uses CSS custom properties for easy theming.
   ============================================================ */

/* ============================================================
   1. CSS VARIABLES
   ============================================================ */
:root {
  /* Background layers */
  --bg-base:       #09111f;
  --bg-raised:     #0d1829;
  --bg-card:       #101e33;
  --bg-card-hover: #132340;

  /* Brand accent */
  --accent:        #3b82f6;
  --accent-dark:   #2563eb;
  --accent-light:  #60a5fa;
  --accent-glow:   rgba(59, 130, 246, 0.18);

  /* Text */
  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #4e657d;

  /* Borders */
  --border:        #1a2d42;
  --border-subtle: #0f1e2e;

  /* Success / availability green */
  --green: #22c55e;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  /* Spacing scale */
  --s-1:  0.25rem;
  --s-2:  0.5rem;
  --s-3:  0.75rem;
  --s-4:  1rem;
  --s-5:  1.25rem;
  --s-6:  1.5rem;
  --s-8:  2rem;
  --s-10: 2.5rem;
  --s-12: 3rem;
  --s-16: 4rem;
  --s-20: 5rem;
  --s-24: 6rem;

  /* Layout */
  --max-w:    1200px;
  --nav-h:    72px;

  /* Border radius */
  --r-sm:   6px;
  --r-md:   10px;
  --r-lg:   16px;
  --r-xl:   22px;
  --r-full: 9999px;

  /* Shadows */
  --sh-sm:     0 1px 4px rgba(0,0,0,0.35);
  --sh-md:     0 4px 16px rgba(0,0,0,0.45);
  --sh-lg:     0 8px 40px rgba(0,0,0,0.55);
  --sh-accent: 0 0 32px rgba(59,130,246,0.18);

  /* Transitions */
  --t-fast: 140ms ease;
  --t-base: 240ms ease;
  --t-slow: 420ms ease;
}

/* ============================================================
   2. RESET & BASE
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

/* Offset for sticky header when jumping to anchors */
section[id] {
  scroll-margin-top: var(--nav-h);
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

ul { list-style: none; }

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

img { max-width: 100%; display: block; }

/* Custom scrollbar (WebKit) */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: var(--r-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* Selection color */
::selection {
  background: rgba(59, 130, 246, 0.3);
  color: var(--text-primary);
}

/* ============================================================
   3. LAYOUT UTILITIES
   ============================================================ */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--s-8);
}

/* ============================================================
   4. BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 0.7rem 1.45rem;
  border-radius: var(--r-md);
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  transition: all var(--t-base);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn--primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(59, 130, 246, 0.38);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border);
}
.btn--ghost:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.06);
  transform: translateY(-2px);
}

.btn--full {
  width: 100%;
  justify-content: center;
}

/* ============================================================
   5. TAGS
   ============================================================ */
.tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: rgba(148, 163, 184, 0.06);
  border: 1px solid var(--border);
  padding: 3px 10px;
  border-radius: var(--r-full);
  line-height: 1.5;
}

.tag--blue {
  color: var(--accent-light);
  background: rgba(59, 130, 246, 0.08);
  border-color: rgba(59, 130, 246, 0.22);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-1);
}

/* ============================================================
   6. HEADER / NAV
   ============================================================ */
.header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 900;
  height: var(--nav-h);
  border-bottom: 1px solid transparent;
  transition:
    background-color var(--t-base),
    backdrop-filter  var(--t-base),
    border-color     var(--t-base);
}

.header.scrolled {
  background: rgba(9, 17, 31, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom-color: var(--border);
}

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

/* Logo */
.nav__logo {
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  transition: color var(--t-fast);
}
.nav__logo:hover { color: var(--accent-light); }
.nav__logo-dot   { color: var(--accent); }

/* Nav links */
.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--s-8);
}

.nav__link {
  position: relative;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--t-fast);
  padding-block: var(--s-1);
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: var(--r-full);
  transition: width var(--t-base);
}
.nav__link:hover,
.nav__link.active {
  color: var(--text-primary);
}
.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

/* Nav right */
.nav__right {
  display: flex;
  align-items: center;
  gap: var(--s-5);
}

/* Language toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--s-1);
}
.lang-btn {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 4px 8px;
  border-radius: var(--r-sm);
  transition: color var(--t-fast), background-color var(--t-fast);
}
.lang-btn:hover     { color: var(--text-secondary); }
.lang-btn--active   { color: var(--accent); background: rgba(59, 130, 246, 0.1); }
.lang-divider       { color: var(--border); font-size: 0.75rem; }

/* Hamburger */
.hamburger {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  border-radius: var(--r-sm);
  transition: color var(--t-fast), background-color var(--t-fast);
}
.hamburger:hover { color: var(--text-primary); background: var(--bg-card); }

.hamburger__icon--close { display: none; }

.hamburger.is-open .hamburger__icon--open  { display: none; }
.hamburger.is-open .hamburger__icon--close { display: block; }

/* ============================================================
   7. HERO
   ============================================================ */
.hero {
  position: relative;
  display: flex;
  align-items: flex-start;
  overflow: hidden;
}

/* Background layers */
.hero__bg { position: absolute; inset: 0; z-index: 0; }

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59,130,246,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.035) 1px, transparent 1px);
  background-size: 64px 64px;
}

.hero__glow {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}
.hero__glow--1 {
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(59,130,246,0.1) 0%, transparent 68%);
  top: -220px;
  right: -160px;
  animation: glow-pulse 8s ease-in-out infinite;
}
.hero__glow--2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(99,102,241,0.07) 0%, transparent 68%);
  bottom: 80px;
  left: -150px;
  animation: glow-pulse 10s ease-in-out infinite reverse;
}
@keyframes glow-pulse {
  0%,100% { opacity: 0.6; transform: scale(1);    }
  50%      { opacity: 1;   transform: scale(1.08); }
}

/* Container */
.hero__container {
  position: relative;
  z-index: 1;
  padding-block: calc(var(--nav-h) + var(--s-16)) var(--s-20);
  width: 100%;
}

/* Two-column inner */
.hero__inner {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--s-12);
  align-items: center;
  margin-bottom: var(--s-12);
}

/* Availability badge */
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-size: 0.8125rem;
  font-weight: 500;
  color: #4ade80;
  background: rgba(34,197,94,0.07);
  border: 1px solid rgba(34,197,94,0.22);
  border-radius: var(--r-full);
  padding: 6px 14px;
  margin-bottom: var(--s-6);
}
.hero__badge-dot {
  width: 7px;
  height: 7px;
  background: var(--green);
  border-radius: 50%;
  flex-shrink: 0;
  animation: dot-pulse 2.2s ease-in-out infinite;
}
@keyframes dot-pulse {
  0%,100% { opacity: 1; transform: scale(1);   }
  50%      { opacity: 0.4; transform: scale(0.75); }
}

/* Title */
.hero__title {
  font-size: clamp(2.4rem, 4.5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: var(--s-4);
  display: flex;
  flex-direction: column;
}
.hero__title-accent {
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 45%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Subtitle — monospace */
.hero__subtitle {
  font-family: var(--font-mono);
  font-size: clamp(0.8rem, 1.4vw, 0.9375rem);
  color: var(--accent);
  opacity: 0.88;
  margin-bottom: var(--s-5);
}

/* Description */
.hero__desc {
  font-size: clamp(0.9375rem, 1.3vw, 1.0625rem);
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 560px;
  margin-bottom: var(--s-8);
}

/* CTA row */
.hero__actions {
  display: flex;
  align-items: center;
  gap: var(--s-4);
  flex-wrap: wrap;
}

/* Stat cards */
.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-4);
  padding-top: var(--s-8);
  border-top: 1px solid var(--border);
}

.stat-card {
  display: flex;
  align-items: center;
  gap: var(--s-4);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--s-4) var(--s-5);
  transition: border-color var(--t-base), transform var(--t-base), box-shadow var(--t-base);
}
.stat-card:hover {
  border-color: rgba(59,130,246,0.45);
  transform: translateY(-3px);
  box-shadow: var(--sh-md), var(--sh-accent);
}

.stat-card__icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59,130,246,0.1);
  border-radius: var(--r-md);
  color: var(--accent);
  font-size: 1.125rem;
  flex-shrink: 0;
  transition: background-color var(--t-base);
}
.stat-card:hover .stat-card__icon { background: rgba(59,130,246,0.18); }

.stat-card__number {
  display: block;
  font-size: 1rem;
  font-weight: 800;
  color: var(--accent-light);
  line-height: 1.2;
}
.stat-card__label {
  display: block;
  font-size: 0.6875rem;
  color: var(--text-muted);
  line-height: 1.35;
  margin-top: 2px;
}

/* ============================================================
   8. CODE CARD (Hero visual)
   ============================================================ */
.code-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  box-shadow: var(--sh-lg), var(--sh-accent);
  animation: float 7s ease-in-out infinite;
}
@keyframes float {
  0%,100% { transform: translateY(0px);    }
  50%      { transform: translateY(-10px); }
}

.code-card__header {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  padding: 0.7rem 1rem;
  background: rgba(255,255,255,0.025);
  border-bottom: 1px solid var(--border);
}
.code-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.code-dot--red    { background: #ff5f57; }
.code-dot--yellow { background: #febc2e; }
.code-dot--green  { background: #28c840; }

.code-card__filename {
  margin-left: auto;
  font-size: 0.6875rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.code-card__body {
  padding: 1.25rem 1.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.9;
  overflow: auto;
}

/* Syntax tokens */
.tok-comment  { color: #4a6580; font-style: italic; }
.tok-kw       { color: #c792ea; }
.tok-type     { color: #82aaff; }
.tok-str      { color: #c3e88d; }
.tok-prop     { color: #f78c6c; }

.code-card__footer {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-1);
  padding: 0.8rem 1.25rem;
  border-top: 1px solid var(--border);
}
.tech-pill {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--accent-light);
  background: rgba(59,130,246,0.09);
  border: 1px solid rgba(59,130,246,0.22);
  padding: 2px 9px;
  border-radius: var(--r-full);
  font-family: var(--font-mono);
}

/* ============================================================
   9. SHARED SECTION STYLES
   ============================================================ */
.section {
  padding-block: var(--s-24);
}
.section--alt {
  background: var(--bg-raised);
}

.section__hd {
  text-align: center;
  margin-bottom: var(--s-16);
}
.section__label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--s-2);
}
.section__title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  line-height: 1.15;
  margin-bottom: var(--s-4);
}
.section__sub {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin-inline: auto;
  line-height: 1.7;
}

/* ============================================================
   10. SERVICES
   ============================================================ */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
}

.svc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--s-8);
  position: relative;
  overflow: hidden;
  transition: border-color var(--t-base), transform var(--t-base), box-shadow var(--t-base);
}
.svc-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--t-base);
}
.svc-card:hover {
  border-color: rgba(59,130,246,0.4);
  transform: translateY(-5px);
  box-shadow: var(--sh-lg), var(--sh-accent);
}
.svc-card:hover::before { opacity: 1; }

.svc-card__icon {
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59,130,246,0.1);
  border-radius: var(--r-md);
  font-size: 1.2rem;
  color: var(--accent);
  margin-bottom: var(--s-6);
  transition: background-color var(--t-base), transform var(--t-base);
}
.svc-card:hover .svc-card__icon {
  background: rgba(59,130,246,0.18);
  transform: scale(1.06);
}

.svc-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--s-2);
  line-height: 1.3;
}
.svc-card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: var(--s-5);
}

/* ============================================================
   11. SKILLS
   ============================================================ */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
}

.skill-group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--s-6) var(--s-8);
  transition: border-color var(--t-base);
}
.skill-group:hover { border-color: rgba(59,130,246,0.28); }

.skill-group__hd {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  margin-bottom: var(--s-5);
  padding-bottom: var(--s-4);
  border-bottom: 1px solid var(--border-subtle);
}
.skill-group__icon {
  color: var(--accent);
  font-size: 0.9375rem;
}
.skill-group__title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
}

.skill-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-1);
}
.skill-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: rgba(148,163,184,0.055);
  border: 1px solid var(--border);
  padding: 4px 11px;
  border-radius: var(--r-full);
  transition: all var(--t-fast);
  cursor: default;
}
.skill-tag:hover {
  color: var(--accent-light);
  background: rgba(59,130,246,0.08);
  border-color: rgba(59,130,246,0.28);
}

/* ============================================================
   12. EXPERIENCE — TIMELINE
   ============================================================ */
.timeline {
  position: relative;
  max-width: 760px;
  margin-inline: auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 19px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--border) 8%, var(--border) 92%, transparent);
}

.timeline__item {
  position: relative;
  padding-left: 58px;
  margin-bottom: var(--s-8);
}
.timeline__item:last-child { margin-bottom: 0; }

.timeline__dot {
  position: absolute;
  left: 13px;
  top: 22px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-base);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.22);
  transition: box-shadow var(--t-base);
}
.timeline__item:hover .timeline__dot {
  box-shadow: 0 0 0 5px rgba(59,130,246,0.25), 0 0 12px rgba(59,130,246,0.3);
}

.timeline__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid rgba(59,130,246,0.15);
  border-radius: var(--r-lg);
  padding: var(--s-6) var(--s-8);
  transition: border-color var(--t-base), border-left-color var(--t-base);
}
.timeline__item:hover .timeline__card {
  border-color: rgba(59,130,246,0.3);
  border-left-color: var(--accent);
}

.timeline__badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(59,130,246,0.08);
  border: 1px solid rgba(59,130,246,0.22);
  padding: 2px 10px;
  border-radius: var(--r-full);
  margin-bottom: var(--s-2);
}
.timeline__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--s-2);
  line-height: 1.3;
}
.timeline__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ============================================================
   13. PROJECTS
   ============================================================ */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-5);
}

.proj-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--s-8);
  position: relative;
  overflow: hidden;
  transition: border-color var(--t-base), transform var(--t-base), box-shadow var(--t-base);
}
.proj-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(59,130,246,0.04) 0%, transparent 55%);
  opacity: 0;
  transition: opacity var(--t-base);
  pointer-events: none;
}
.proj-card:hover {
  border-color: rgba(59,130,246,0.45);
  transform: translateY(-5px);
  box-shadow: var(--sh-lg), var(--sh-accent);
}
.proj-card:hover::after { opacity: 1; }

.proj-card__hd {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--s-5);
}
.proj-card__icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59,130,246,0.1);
  border-radius: var(--r-md);
  font-size: 1.125rem;
  color: var(--accent);
  transition: background-color var(--t-base);
}
.proj-card:hover .proj-card__icon { background: rgba(59,130,246,0.2); }

.proj-card__num {
  font-size: 2.5rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: rgba(59,130,246,0.08);
  line-height: 1;
  transition: color var(--t-base);
}
.proj-card:hover .proj-card__num { color: rgba(59,130,246,0.18); }

.proj-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--s-2);
  line-height: 1.3;
}
.proj-card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: var(--s-5);
}

/* ============================================================
   14. ABOUT
   ============================================================ */
.about__body {
  max-width: 720px;
  margin-inline: auto;
  text-align: center;
}
.about__text {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: var(--s-8);
}
.about__quote {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-lg);
  padding: var(--s-8) var(--s-10);
  text-align: left;
}
.about__quote-icon {
  color: var(--accent);
  font-size: 1.5rem;
  opacity: 0.25;
  margin-bottom: var(--s-3);
  display: block;
}
.about__quote p {
  font-size: 1.0625rem;
  font-style: italic;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.75;
}

/* ============================================================
   15. CONTACT
   ============================================================ */
.contact__layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--s-10);
  max-width: 860px;
  margin-inline: auto;
}

/* Form */
.form__group { margin-bottom: var(--s-5); }

.form__label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--s-2);
}

.form__input,
.form__textarea {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 0.7rem 1rem;
  font-size: 0.9375rem;
  color: var(--text-primary);
  font-family: inherit;
  outline: none;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.form__input::placeholder,
.form__textarea::placeholder { color: var(--text-muted); }

.form__input:focus,
.form__textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.13);
}
.form__textarea {
  resize: vertical;
  min-height: 130px;
}

/* Inline feedback message */
.form__feedback {
  font-size: 0.875rem;
  padding: 0.7rem 1rem;
  border-radius: var(--r-md);
  margin-top: var(--s-4);
}
.form__feedback--success {
  color: #4ade80;
  background: rgba(34,197,94,0.08);
  border: 1px solid rgba(34,197,94,0.22);
}
.form__feedback--error {
  color: #f87171;
  background: rgba(248,113,113,0.08);
  border: 1px solid rgba(248,113,113,0.22);
}

/* Contact info sidebar */
.contact__info { padding-top: var(--s-2); }

.contact__connect-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--s-5);
}

.social-links {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
}

.social-link {
  display: flex;
  align-items: center;
  gap: var(--s-4);
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--s-4) var(--s-5);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all var(--t-base);
}
.social-link:hover {
  color: var(--accent-light);
  border-color: rgba(59,130,246,0.32);
  transform: translateX(4px);
  background: rgba(59,130,246,0.04);
}
.social-link__icon {
  font-size: 1.1rem;
  color: var(--accent);
  width: 18px;
  text-align: center;
  flex-shrink: 0;
}
.social-link__arrow {
  margin-left: auto;
  font-size: 0.7rem;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--t-base), transform var(--t-base);
}
.social-link:hover .social-link__arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ============================================================
   16. FOOTER
   ============================================================ */
.footer {
  background: var(--bg-raised);
  border-top: 1px solid var(--border);
  padding-block: var(--s-8);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--s-4);
}
.footer__logo {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}
.footer__copy {
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-align: center;
  flex: 1;
}
.footer__top {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  transition: all var(--t-base);
}
.footer__top:hover {
  color: var(--accent);
  border-color: rgba(59,130,246,0.4);
  transform: translateY(-2px);
}

/* ============================================================
   17. SCROLL-REVEAL ANIMATIONS
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays — service cards */
.services__grid .svc-card:nth-child(1) { transition-delay:   0ms; }
.services__grid .svc-card:nth-child(2) { transition-delay:  70ms; }
.services__grid .svc-card:nth-child(3) { transition-delay: 140ms; }
.services__grid .svc-card:nth-child(4) { transition-delay:   0ms; }
.services__grid .svc-card:nth-child(5) { transition-delay:  70ms; }
.services__grid .svc-card:nth-child(6) { transition-delay: 140ms; }

/* Stagger delays — skill groups */
.skills__grid .skill-group:nth-child(1) { transition-delay:   0ms; }
.skills__grid .skill-group:nth-child(2) { transition-delay:  70ms; }
.skills__grid .skill-group:nth-child(3) { transition-delay: 140ms; }
.skills__grid .skill-group:nth-child(4) { transition-delay:   0ms; }
.skills__grid .skill-group:nth-child(5) { transition-delay:  70ms; }
.skills__grid .skill-group:nth-child(6) { transition-delay: 140ms; }

/* Stagger delays — project cards */
.projects__grid .proj-card:nth-child(1) { transition-delay:   0ms; }
.projects__grid .proj-card:nth-child(2) { transition-delay:  90ms; }
.projects__grid .proj-card:nth-child(3) { transition-delay:   0ms; }
.projects__grid .proj-card:nth-child(4) { transition-delay:  90ms; }

/* ============================================================
   18. RESPONSIVE — TABLET  (≤ 1024px)
   ============================================================ */
@media (max-width: 1024px) {
  .hero__inner {
    grid-template-columns: 1fr 320px;
    gap: var(--s-8);
  }
  .services__grid,
  .skills__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero__stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================================
   19. RESPONSIVE — MOBILE  (≤ 800px)
   ============================================================ */
@media (max-width: 800px) {
  :root {
    --s-24: 5rem;
    --s-20: 4rem;
    --s-16: 3rem;
  }

  /* Show hamburger, hide menu by default */
  .hamburger { display: flex; }

  .nav__menu {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(9, 17, 31, 0.97);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--s-6) var(--s-8);
    gap: var(--s-2);
    border-bottom: 1px solid var(--border);
    transform: translateY(-110%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--t-base), opacity var(--t-base), visibility var(--t-base);
    z-index: 800;
  }
  .nav__menu.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
  .nav__link {
    font-size: 1rem;
    padding-block: var(--s-3);
  }

  /* Hero */
  .hero__inner {
    grid-template-columns: 1fr;
  }
  .hero__visual { display: none; }

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

  /* Grids */
  .services__grid,
  .skills__grid,
  .projects__grid {
    grid-template-columns: 1fr;
  }

  /* Contact */
  .contact__layout {
    grid-template-columns: 1fr;
  }

  /* Timeline */
  .timeline::before { left: 15px; }
  .timeline__item   { padding-left: 46px; }
  .timeline__dot    { left: 9px; }

  /* Footer */
  .footer__inner {
    flex-direction: column;
    text-align: center;
  }
  .footer__copy { flex: unset; }
}

/* ============================================================
   20. RESPONSIVE — SMALL MOBILE  (≤ 480px)
   ============================================================ */
@media (max-width: 480px) {
  .container { padding-inline: var(--s-5); }

  .hero__stats { grid-template-columns: 1fr; }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }
  .hero__actions .btn { justify-content: center; }

  .section__hd { margin-bottom: var(--s-10); }
}