/* ─── CSS Variables ─── */
:root {
  --accent: #3b82f6;
  --accent-dim: #1d4ed8;
  --accent-glow: rgba(59, 130, 246, 0.12);
  --accent-text: #60a5fa;

  /* Spacing Scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 2.5rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 5rem;
  --space-5xl: 6rem;
}

[data-theme="dark"] {
  --bg: #0f1117;
  --bg-2: #161b22;
  --bg-card: #1c2128;
  --bg-card-hover: #262d34;
  --border: rgba(255, 255, 255, 0.1);
  --text-1: #e0e6ed;
  --text-2: #8b949e;
  --text-3: #6e7681;
  --shadow: rgba(0, 0, 0, 0.5);

  /* Hero theming */
  --hero-name-from: #fff;
  --badge-bg: linear-gradient(135deg, #2a2a2a, #1a1a1a);
  --badge-border: rgba(180, 180, 190, 0.25);
  --badge-color: #a8a8b3;
  --badge-shadow: 0 0 10px rgba(160, 160, 180, 0.08);
  --badge-inset: rgba(255, 255, 255, 0.06);
  --badge-hover-bg: linear-gradient(135deg, #3a3a42, #252529);
  --badge-hover-border: rgba(210, 210, 225, 0.45);
  --badge-hover-color: #d4d4e0;
  --badge-shimmer: rgba(255, 255, 255, 0.18);

  /* Neural network theming */
  --neural-primary: #2b6fff;
  --neural-secondary: #38cfef;
  --neural-glow: rgba(43, 111, 255, 0.15);
  --neural-pulse: #4da6ff;
}

[data-theme="light"] {
  --bg: #fafbfc;
  --bg-2: #f6f8fa;
  --bg-card: #ffffff;
  --bg-card-hover: #f6f8fa;
  --border: rgba(0, 0, 0, 0.1);
  --text-1: #0d1117;
  --text-2: #57606a;
  --text-3: #6e7681;
  --shadow: rgba(0, 0, 0, 0.08);

  /* Hero theming */
  --hero-name-from: #1a1a2e;
  --badge-bg: linear-gradient(135deg, #e8e8ec, #d8d8de);
  --badge-border: rgba(120, 120, 140, 0.3);
  --badge-color: #555565;
  --badge-shadow: 0 0 10px rgba(100, 100, 120, 0.1);
  --badge-inset: rgba(255, 255, 255, 0.5);
  --badge-hover-bg: linear-gradient(135deg, #dcdce2, #ccccda);
  --badge-hover-border: rgba(100, 100, 130, 0.45);
  --badge-hover-color: #333345;
  --badge-shimmer: rgba(255, 255, 255, 0.45);

  /* Neural network theming */
  --neural-primary: #1a56db;
  --neural-secondary: #3b82f6;
  --neural-glow: rgba(26, 86, 219, 0.12);
  --neural-pulse: #60a5fa;
}

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

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

body {
  background: var(--bg);
  color: var(--text-1);
  font-family: 'Sora', sans-serif;
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

/* ─── Layout ─── */
.layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ─── Header ─── */
.header {
  position: sticky;
  top: 0;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  /* Needed for absolute-positioned mobile nav dropdown */
  position: -webkit-sticky;
  position: sticky;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) 5%;
  max-width: 100%;
  margin: 0;
  width: 100%;
  gap: var(--space-lg);
}

/* ─── Hamburger Button ─── */
.hamburger-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  padding: 7px;
  z-index: 110;
  transition: border-color 0.2s, background 0.2s;
  flex-shrink: 0;
}

.hamburger-btn:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.hamburger-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}

.hamburger-btn.active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger-btn.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger-btn.active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.header-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.header-nav {
  display: flex;
  gap: var(--space-xl);
  flex: 1;
  justify-content: center;
  align-items: center;
}

.nav-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-2);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font-family: 'Sora', sans-serif;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--text-1);
}

.nav-link.active {
  color: var(--text-1);
}

/* ─── Main ─── */
.main {
  flex: 1;
  width: 100%;
  padding: 0;
  margin: 0;
}

/* ─── Sections ─── */
section {
  padding: var(--space-3xl) 5%;
  scroll-margin-top: 80px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: clamp(0.85rem, 2vw, 0.95rem);
  color: var(--text-2);
  max-width: 600px;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

/* ─── Hero ─── */
#hero {
  padding-bottom: var(--space-5xl);
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  align-items: center;
  gap: var(--space-4xl);
}



.hero-text {
  margin-bottom: clamp(2rem, 5vw, 10rem);
}

.hero-visual {
  width: 100%;
  height: 100%;
  min-height: 500px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible;
}



.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.8rem;
  border-radius: 100px;
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  font-size: 0.75rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--badge-color);
  margin-bottom: var(--space-md);
  box-shadow:
    var(--badge-shadow),
    inset 0 1px 0 var(--badge-inset);
  opacity: 0;
  animation: slide-up-fade 0.8s ease-out forwards 0.1s;
  transition: all 0.35s ease-in-out;
  position: relative;
  overflow: hidden;
}

/* Shimmer sweep on hover */
.hero-badge::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(
    120deg,
    transparent 0%,
    var(--badge-shimmer) 50%,
    transparent 100%
  );
  transform: skewX(-20deg);
  transition: left 0.55s ease;
  pointer-events: none;
}

.hero-badge:hover::before {
  left: 160%;
}

.hero-badge:hover {
  background: var(--badge-hover-bg);
  border-color: var(--badge-hover-border);
  color: var(--badge-hover-color);
  box-shadow:
    0 0 14px rgba(180, 180, 210, 0.18),
    0 0 32px rgba(180, 180, 210, 0.08),
    inset 0 1px 0 var(--badge-inset);
  transform: translateY(-2px);
}



.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse-dot 2.2s ease-in-out infinite;
  box-shadow: 0 0 4px rgba(156, 163, 175, 0.6);
}

@keyframes pulse-dot {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.4;
    transform: scale(0.75);
  }
}

.hero-name {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--text-1);
  margin-bottom: var(--space-md);
  background: linear-gradient(90deg, var(--hero-name-from), var(--accent-text));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 30px var(--accent-glow);
  opacity: 0;
  animation: slide-up-fade 0.8s ease-out forwards 0.2s;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-2);
  max-width: 600px;
  line-height: 1.8;
  margin-bottom: var(--space-xl);
  opacity: 0;
  animation: slide-up-fade 0.8s ease-out forwards 0.3s;
}



.hero-meta {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  opacity: 0;
  animation: slide-up-fade 0.8s ease-out forwards 0.4s;
}



.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-2);
  font-family: 'JetBrains Mono', monospace;
}

.hero-meta-item svg {
  color: var(--accent);
  flex-shrink: 0;
  width: 14px;
  height: 14px;
}

.hero-actions {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-top: 1rem;
  opacity: 0;
  animation: slide-up-fade 0.8s ease-out forwards 0.5s;
}



@keyframes slide-up-fade {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.83rem;
  font-weight: 600;
  font-family: 'Sora', sans-serif;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  box-shadow: 0 4px 18px rgba(59, 130, 246, 0.28);
  text-decoration: none;
}

.btn-primary:hover {
  background: var(--accent-dim);
  transform: translateY(-2px);
  box-shadow: 0 6px 26px rgba(59, 130, 246, 0.38);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  background: none;
  color: var(--text-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.83rem;
  font-weight: 500;
  font-family: 'Sora', sans-serif;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
  text-decoration: none;
}

.btn-ghost:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-2px);
  box-shadow: 0 6px 26px rgba(59, 130, 246, 0.2);
}

/* ─── About ─── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  margin-top: var(--space-2xl);
  align-items: start;
}

.about-text .about-headline {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.02em;
  line-height: 1.4;
  margin-bottom: var(--space-md);
  background: linear-gradient(90deg, var(--text-1), var(--accent-text));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.about-text p {
  font-size: 0.98rem;
  color: var(--text-2);
  line-height: 1.85;
  margin-bottom: var(--space-md);
}

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-xl);
  box-shadow: 0 4px 20px var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px var(--shadow);
  border-color: var(--accent);
}

.about-info-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border);
}

.about-info-item:last-of-type {
  border-bottom: none;
}

.about-info-icon {
  color: var(--accent);
  background: var(--accent-glow);
  padding: 8px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0;
  flex-shrink: 0;
}

.about-info-label {
  font-size: 0.65rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.about-info-value {
  font-size: 0.8rem;
  color: var(--text-1);
  font-weight: 500;
  margin-top: var(--space-xs);
  word-break: break-word;
}

.about-info-value a {
  color: var(--accent-text);
  transition: color 0.2s;
}

.about-info-value a:hover {
  color: var(--accent);
}

.about-quote {
  font-size: 0.78rem;
  font-style: italic;
  color: var(--text-2);
  border-left: 2px solid var(--accent);
  padding-left: var(--space-md);
  margin-top: var(--space-lg);
  line-height: 1.65;
}

/* ─── Skills ─── */
.skills-main {
  margin-top: var(--space-2xl);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--space-xl);
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: var(--space-lg);
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}

.skill-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
}

.skill-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.skill-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-1);
}

.skill-level {
  font-size: 0.63rem;
  font-family: 'JetBrains Mono', monospace;
  padding: 0.18rem 0.55rem;
  border-radius: 100px;
  border: 1px solid rgba(59, 130, 246, 0.25);
  color: var(--accent-text);
  background: var(--accent-glow);
}

/* ─── Metallic Badge (reusable shimmer effect) ─── */
.metallic-badge {
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  color: var(--badge-color);
  box-shadow:
    var(--badge-shadow),
    inset 0 1px 0 var(--badge-inset);
  position: relative;
  overflow: hidden;
  transition: all 0.35s ease-in-out;
}

.metallic-badge::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(
    120deg,
    transparent 0%,
    var(--badge-shimmer) 50%,
    transparent 100%
  );
  transform: skewX(-20deg);
  transition: left 0.55s ease;
  pointer-events: none;
}

.metallic-badge:hover::before {
  left: 160%;
}

.metallic-badge:hover {
  background: var(--badge-hover-bg);
  border-color: var(--badge-hover-border);
  color: var(--badge-hover-color);
  box-shadow:
    0 0 14px rgba(180, 180, 210, 0.18),
    0 0 32px rgba(180, 180, 210, 0.08),
    inset 0 1px 0 var(--badge-inset);
  transform: translateY(-2px);
}

.skill-desc {
  font-size: 0.78rem;
  color: var(--text-2);
  line-height: 1.65;
}

.toolbox-title {
  font-size: 0.73rem;
  font-weight: 600;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-family: 'JetBrains Mono', monospace;
  margin: var(--space-2xl) 0 var(--space-md);
}

.toolbox-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tool-pill {
  font-size: 0.72rem;
  font-family: 'JetBrains Mono', monospace;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-2);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
  cursor: default;
}

.tool-pill:hover {
  border-color: var(--accent);
  color: var(--accent-text);
  background: var(--accent-glow);
}

/* ─── Timeline (Experience & Education) ─── */
.timeline {
  position: relative;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-2xl);
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 8px;
  bottom: 0;
  left: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-2xl);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: calc(-2rem - 5px);
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px var(--bg);
}

.timeline-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: 0.3rem;
  letter-spacing: 0.02em;
}

.timeline-date span {
  font-size: 0.65rem;
  font-family: 'Sora', sans-serif;
  padding: 0.15rem 0.5rem;
  border-radius: 100px;
  background: var(--accent-glow);
  color: var(--accent-text);
  margin-left: 0.6rem;
  border: 1px solid rgba(59, 130, 246, 0.15);
  vertical-align: text-bottom;
}

.timeline-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.01em;
}

.timeline-subtitle {
  font-size: 0.83rem;
  color: var(--text-2);
  margin-top: 0.2rem;
  font-weight: 500;
}

.timeline-content {
  margin-top: 0.8rem;
}

.timeline-content p {
  font-size: 0.83rem;
  color: var(--text-2);
  line-height: 1.7;
}

.exp-bullets {
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.exp-bullets li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.83rem;
  color: var(--text-2);
  line-height: 1.65;
}

.exp-bullets li::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  margin-top: 0.58rem;
}

/* ─── Projects ─── */
.projects-grid {
  margin-top: var(--space-lg);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-md);
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: border-color 0.25s, background 0.25s, transform 0.25s, box-shadow 0.25s;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.25s;
}

.project-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px var(--shadow);
}

.project-card:hover::before {
  opacity: 1;
}

.project-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.02em;
}

.project-desc {
  font-size: 0.78rem;
  color: var(--text-2);
  line-height: 1.6;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.project-tag {
  font-size: 0.6rem;
  font-family: 'JetBrains Mono', monospace;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  background: var(--accent-glow);
  color: var(--accent-text);
  border: 1px solid rgba(59, 130, 246, 0.18);
}

.project-footer {
  display: flex;
  align-items: center;
  padding-top: var(--space-xs);
  border-top: none;
}

.project-link {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--accent-text);
  transition: gap 0.2s, color 0.2s;
}

.project-link:hover {
  gap: 0.5rem;
  color: var(--accent);
}



/* ─── Certificates ─── */
.cert-category {
  margin-top: var(--space-2xl);
}

.cert-category:first-of-type {
  margin-top: var(--space-xl);
}

.cert-category-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0;
}

.certs-grid {
  margin-top: var(--space-sm);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-md);
}

.cert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
  text-decoration: none;
}

.cert-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
}

.cert-icon {
  font-size: 1.1rem;
  margin-bottom: 0;
}

.cert-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-1);
  letter-spacing: -0.01em;
}

.cert-desc {
  font-size: 0.7rem;
  color: var(--text-2);
  line-height: 1.45;
}

/* ─── Contact ─── */

/* Info icons row — centered under description */
.contact-icons-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  margin-top: var(--space-md);
  margin-bottom: var(--space-2xl);
}

/* Individual icon button */
.contact-icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-2);
  text-decoration: none;
  cursor: pointer;
  position: relative;
  transition: color 0.3s, border-color 0.3s, background 0.3s, transform 0.3s, box-shadow 0.3s;
}

.contact-icon-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-4px) scale(1.1);
  box-shadow: 0 6px 20px var(--accent-glow), 0 0 12px var(--accent-glow);
}

.contact-icon-btn--static {
  cursor: default;
}

/* Contact form — full width */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  position: relative;
}

.form-label {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-family: 'JetBrains Mono', monospace;
}

.form-input,
.form-textarea {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem 0.95rem;
  color: var(--text-1);
  font-family: 'Sora', sans-serif;
  font-size: 0.83rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
  width: 100%;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-3);
}

.form-textarea {
  resize: vertical;
  min-height: 130px;
}

/* Field-level validation error */
.form-input--error {
  border-color: #ef4444 !important;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.12) !important;
}

.field-error {
  font-size: 0.7rem;
  color: #ef4444;
  margin-top: 0.25rem;
  font-family: 'JetBrains Mono', monospace;
}

/* Form footer: button + status */
.contact-form-footer {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Loading spinner inside button */
.btn-spinner {
  display: none;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.btn-loading .send-icon { display: none; }
.btn-loading .btn-text { display: none; }
.btn-loading .btn-spinner { display: inline-block; }

.btn-loading {
  opacity: 0.75;
  cursor: not-allowed;
  pointer-events: none;
  min-width: 120px;
  justify-content: center;
}

/* Success state for button */
.btn-success {
  background: #22c55e !important;
  box-shadow: 0 4px 18px rgba(34, 197, 94, 0.35) !important;
  pointer-events: none;
}

.btn-success .send-icon { display: none; }
.btn-success .btn-text { display: none; }
.btn-success .success-icon { display: inline-block !important; }

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Status messages */
.contact-status {
  font-size: 0.8rem;
  font-weight: 500;
  transition: opacity 0.3s ease;
  line-height: 1.5;
}

.contact-status:empty {
  display: none;
}

.contact-status--success {
  color: #22c55e;
}

.contact-status--error {
  color: #ef4444;
}

.contact-status--loading {
  color: var(--accent-text);
}

/* ─── Footer ─── */
footer {
  padding: var(--space-2xl) 5%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-xl);
}

.footer-copy {
  display: none;
}

.footer-built {
  display: none;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-2);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

#themeLabel {
  display: none;
}

/* ─── Fade-up ─── */
.fade-up {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .fade-up {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero-badge-dot {
    animation: none;
  }

  * {
    transition-duration: 0.01ms !important;
  }
}

/* ═══════════════════════════════════════════
   RESPONSIVE — Mobile-first breakpoint system
   Base = mobile, then scale up
   ═══════════════════════════════════════════ */

/* ── ≤ 480px  Small Mobile ── */
@media (max-width: 480px) {
  .hero-name {
    font-size: clamp(1.6rem, 7vw, 2.4rem);
  }

  .hero-desc {
    font-size: 0.9rem;
  }

  .hero-visual {
    min-height: 220px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn-primary,
  .hero-actions .btn-ghost {
    justify-content: center;
    width: 100%;
  }

  .section-label {
    font-size: 0.6rem;
  }

  .about-text p {
    font-size: 0.88rem;
  }

  .about-card {
    padding: var(--space-md);
  }

  .skill-card {
    padding: var(--space-md);
  }

  .skills-main {
    grid-template-columns: 1fr;
  }

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

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

  .contact-icon-btn {
    width: 42px;
    height: 42px;
  }

  .contact-icons-row {
    gap: var(--space-md);
  }

  .timeline {
    padding-left: 1.5rem;
  }

  .timeline-dot {
    left: calc(-1.5rem - 5px);
  }
}

/* ── ≤ 768px  Mobile / Hamburger Menu ── */
@media (max-width: 768px) {
  /* Body scroll lock when menu is open */
  body.menu-open {
    overflow: hidden;
  }

  .hamburger-btn {
    display: flex;
    order: 2;
  }

  .header-container {
    flex-wrap: nowrap;
    position: relative;
  }

  .header-name {
    font-size: 0.95rem;
    order: 1;
    flex: 1;
  }

  .theme-toggle {
    width: 28px;
    height: 28px;
    order: 3;
  }

  .header-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-2);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 0 5%;
    gap: 0;
    box-shadow: 0 8px 24px var(--shadow);
    z-index: 100;
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transition: max-height 0.35s ease, opacity 0.25s ease;
    pointer-events: none;
  }

  .header-nav.open {
    display: flex;
    max-height: 400px;
    opacity: 1;
    padding: var(--space-xs) 5% var(--space-md);
    pointer-events: auto;
  }

  .nav-link {
    font-size: 0.9rem;
    padding: var(--space-sm) var(--space-xs);
    width: 100%;
    text-align: left;
    border-bottom: 1px solid var(--border);
    border-radius: 6px;
    transition: color 0.2s, background 0.2s;
  }

  .nav-link:last-child {
    border-bottom: none;
  }

  .nav-link:hover,
  .nav-link:focus {
    background: var(--accent-glow);
    color: var(--accent-text);
  }

  .hero-layout {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-lg);
  }

  .hero-text {
    margin-bottom: 0;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
    font-size: 0.95rem;
  }

  .hero-badge {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-meta {
    justify-content: center;
  }

  .hero-visual {
    min-height: 280px;
    margin-top: -1rem;
  }

  .about-card {
    max-width: 460px;
    margin: 0 auto;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

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

  .skills-main {
    grid-template-columns: 1fr;
  }

  .certs-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
}

/* ── ≥ 768px  Tablet ── */
@media (min-width: 768px) {
  .header-container {
    padding: var(--space-md) 8%;
  }

  section {
    padding: var(--space-4xl) 8%;
  }

  footer {
    padding: var(--space-3xl) 8%;
  }
}

/* ── ≥ 992px  About grid 2-col & Hero full-height ── */
@media (min-width: 992px) {
  .about-grid {
    grid-template-columns: 1fr minmax(280px, 350px);
    gap: var(--space-3xl);
  }

  .hero-layout {
    grid-template-columns: 1fr 1.1fr;
  }

  #hero {
    min-height: 100vh;
  }

  .skills-main {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }

  .projects-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}

/* ── ≥ 1024px  Desktop ── */
@media (min-width: 1024px) {
  .header-container {
    padding: var(--space-md) 12%;
  }

  section {
    padding: var(--space-5xl) 12%;
  }

  footer {
    padding: var(--space-3xl) 12%;
  }
}

/* ── ≥ 1400px  Wide Desktop ── */
@media (min-width: 1400px) {
  .header-container {
    padding: var(--space-md) 280px;
    gap: var(--space-2xl);
  }

  section {
    padding: var(--space-5xl) 280px;
  }

  footer {
    padding: var(--space-3xl) 280px;
  }
}