/* ============================================================
   TOST.CSS — Premium Developer Portfolio Skills Page
   Design system inspired by Vercel · Linear · Stripe · Framer
   ============================================================ */

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

/* ── Design Tokens ───────────────────────────────────────── */
:root {
  /* Palette */
  --c-bg:          #050508;
  --c-surface:     #0c0c12;
  --c-surface-2:   #111118;
  --c-border:      rgba(255,255,255,0.07);
  --c-border-glow: rgba(99,179,237,0.25);
  --c-text:        #e8eaf0;
  --c-text-2:      #7a8099;
  --c-text-3:      #4a5068;

  /* Accent spectrum */
  --a-blue:        #63b3ed;
  --a-blue-mid:    #4299e1;
  --a-blue-deep:   #2b6cb0;
  --a-cyan:        #76e4f7;
  --a-violet:      #9f7aea;
  --a-green:       #68d391;
  --a-amber:       #f6ad55;
  --a-pink:        #f687b3;

  /* Glow variants */
  --glow-blue:     0 0 20px rgba(99,179,237,0.35);
  --glow-blue-sm:  0 0 10px rgba(99,179,237,0.25);
  --glow-violet:   0 0 20px rgba(159,122,234,0.35);

  /* Glass */
  --glass-bg:      rgba(12,12,20,0.75);
  --glass-border:  rgba(99,179,237,0.12);
  --glass-hover:   rgba(99,179,237,0.08);

  /* Shadows */
  --shadow-sm:     0 2px 8px rgba(0,0,0,0.4);
  --shadow-md:     0 8px 24px rgba(0,0,0,0.5);
  --shadow-lg:     0 20px 48px rgba(0,0,0,0.6);
  --shadow-card:   0 4px 16px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.04);

  /* Fonts */
  --font-display:  'Syne', sans-serif;
  --font-body:     'DM Sans', sans-serif;
  --font-mono:     'JetBrains Mono', monospace;

  /* Motion */
  --ease-spring:   cubic-bezier(0.175, 0.885, 0.32, 1.15);
  --ease-out:      cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out:   cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast:      180ms;
  --dur-mid:       320ms;
  --dur-slow:      500ms;

  /* Layout */
  --radius-sm:     8px;
  --radius-md:     14px;
  --radius-lg:     20px;
  --radius-xl:     28px;
}

/* ── Scrollbar ───────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--c-bg); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--a-blue-mid), var(--a-violet));
  border-radius: 10px;
}

/* ── Base Body ───────────────────────────────────────────── */
body {
  font-family: var(--font-body);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Background Canvas (animated dot grid) ───────────────── */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: -3;
  pointer-events: none;
  opacity: 0.4;
}

/* ── Ambient Orbs ────────────────────────────────────────── */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: -2;
  will-change: transform;
  animation: orbDrift 30s ease-in-out infinite alternate;
}
.orb--1 {
  width: 500px; height: 500px;
  top: -10%; left: -5%;
  background: radial-gradient(circle, rgba(66,153,225,0.12) 0%, transparent 70%);
  animation-duration: 28s;
}
.orb--2 {
  width: 400px; height: 400px;
  top: 50%; right: -8%;
  background: radial-gradient(circle, rgba(159,122,234,0.10) 0%, transparent 70%);
  animation-duration: 35s;
  animation-delay: -10s;
  animation-direction: alternate-reverse;
}
.orb--3 {
  width: 300px; height: 300px;
  bottom: 10%; left: 20%;
  background: radial-gradient(circle, rgba(118,228,247,0.08) 0%, transparent 70%);
  animation-duration: 40s;
  animation-delay: -5s;
}
@keyframes orbDrift {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(30px, -40px) scale(1.08); }
  100% { transform: translate(-20px, 20px) scale(0.95); }
}

/* ── Noise Overlay ───────────────────────────────────────── */
.noise-overlay {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px;
}



/* ── Back Button ─────────────────────────────────────────── */
.back-button-container {
  position: fixed;
  top: 24px; left: 24px;
  z-index: 1000;
}
.back-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: rgba(12,12,20,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--c-border);
  border-radius: 50px;
  color: var(--c-text-2);
  text-decoration: none;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.875rem;
  transition: color var(--dur-mid) var(--ease-out),
              border-color var(--dur-mid) var(--ease-out),
              transform var(--dur-mid) var(--ease-spring),
              box-shadow var(--dur-mid) var(--ease-out);
}
.back-button:hover {
  color: var(--c-text);
  border-color: var(--c-border-glow);
  transform: translateX(-3px);
  box-shadow: var(--glow-blue-sm);
}

/* ── Container ───────────────────────────────────────────── */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ── Scroll Reveal System ────────────────────────────────── */
.reveal-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-up[data-delay="100"] { transition-delay: 100ms; }
.reveal-up[data-delay="200"] { transition-delay: 200ms; }
.reveal-up[data-delay="300"] { transition-delay: 300ms; }
.reveal-up[data-delay="400"] { transition-delay: 400ms; }

/* ── Header ──────────────────────────────────────────────── */
.main-header {
  text-align: center;
  padding: 7rem 0 5rem;
  position: relative;
}

/* Badge pill */
.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  background: rgba(99,179,237,0.06);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--a-blue);
  margin-bottom: 1.75rem;
}
.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--a-blue);
  box-shadow: 0 0 8px var(--a-blue);
  animation: pulseDot 2s ease-in-out infinite;
}
@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.6; transform: scale(0.8); }
}

.main-title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 5.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--c-text);
  margin-bottom: 1.5rem;
}
.title-gradient {
  background: linear-gradient(135deg, var(--a-blue) 0%, var(--a-cyan) 40%, var(--a-violet) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.title-subtext {
  font-family: var(--font-body);
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  font-weight: 300;
  color: var(--c-text-2);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.75;
}

/* Stats bar */
.header-stats {
  display: inline-flex;
  align-items: center;
  gap: 0;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  overflow: hidden;
}
.stat-item {
  padding: 14px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.stat-num {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--a-blue);
  line-height: 1;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-text-3);
}
.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--c-border);
}

/* ── Section Common ──────────────────────────────────────── */
.section {
  padding: 6rem 0;
  position: relative;
}
.section + .section::before {
  content: '';
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 100%; max-width: 900px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-border) 20%, var(--c-border) 80%, transparent);
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}
.section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-text-3);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.75rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
}
.section-desc {
  font-size: 0.95rem;
  color: var(--c-text-2);
  font-weight: 300;
}

/* ── Skill Tabs ──────────────────────────────────────────── */
.skill-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 2.5rem;
}
.skill-tab {
  padding: 7px 18px;
  border-radius: 50px;
  border: 1px solid var(--c-border);
  background: transparent;
  color: var(--c-text-2);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--dur-mid) var(--ease-out);
}
.skill-tab:hover { border-color: var(--c-border-glow); color: var(--c-text); }
.skill-tab.active {
  background: rgba(99,179,237,0.12);
  border-color: var(--a-blue);
  color: var(--a-blue);
  box-shadow: var(--glow-blue-sm);
}

/* ── Tool & Skill Grid ────────────────────────────────────── */
.tools-grid,
.skills-grid {
  display: grid;
  gap: 14px;
}
.tools-grid  { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); }
.skills-grid { grid-template-columns: repeat(auto-fill, minmax(135px, 1fr)); }

/* ── Card Base ───────────────────────────────────────────── */
.tool-item,
.skill-item {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 22px 12px 18px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 128px;
  cursor: pointer;
  overflow: hidden;
  /* GPU-composited transition */
  transition: border-color var(--dur-mid) var(--ease-out),
              box-shadow var(--dur-mid) var(--ease-out),
              transform var(--dur-mid) var(--ease-spring);
  /* Stagger set via JS */
  opacity: 0;
  transform: translateY(20px) scale(0.97);
  will-change: transform, opacity;
}
.tool-item.card-visible,
.skill-item.card-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* Gradient shine sweep */
.tool-item::before,
.skill-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    transparent 30%,
    rgba(99,179,237,0.06) 50%,
    transparent 70%
  );
  transform: translateX(-100%) translateY(-100%);
  transition: transform 0.55s var(--ease-in-out);
  z-index: 1;
  pointer-events: none;
}
.tool-item:hover::before,
.skill-item:hover::before {
  transform: translateX(100%) translateY(100%);
}

/* Glow edge on hover */
.tool-item::after,
.skill-item::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--a-blue), var(--a-violet));
  opacity: 0;
  z-index: -1;
  transition: opacity var(--dur-mid) var(--ease-out);
}
.tool-item:hover::after,
.skill-item:hover::after { opacity: 0.18; }

.tool-item:hover,
.skill-item:hover {
  border-color: var(--c-border-glow);
  box-shadow: var(--glow-blue), var(--shadow-md);
  transform: translateY(-6px) scale(1.03);
}

/* Card content above pseudo-elements */
.tool-icon,
.skill-icon,
.tool-name,
.skill-name {
  position: relative;
  z-index: 2;
}

/* Icons */
.tool-icon,
.skill-icon {
  font-size: 2rem;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--a-blue), var(--a-violet));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 6px rgba(99,179,237,0.4));
  transition: transform var(--dur-mid) var(--ease-spring),
              filter var(--dur-mid) var(--ease-out);
  display: inline-block;
}
.tool-item:hover .tool-icon,
.skill-item:hover .skill-icon {
  transform: scale(1.22) translateY(-2px);
  filter: drop-shadow(0 0 14px rgba(99,179,237,0.7));
}

/* Labels */
.tool-name,
.skill-name {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--c-text-2);
  transition: color var(--dur-mid) var(--ease-out);
  letter-spacing: 0.01em;
}
.tool-item:hover .tool-name,
.skill-item:hover .skill-name { color: var(--a-blue); }

/* Skill category badge (hidden, used for filter) */
.skill-item[data-category] { /* filter handled by JS */ }

/* ── Demo Section ────────────────────────────────────────── */
.demos-container { padding: 0; }
.demos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
  margin-bottom: 18px;
}

/* ── Demo Card Base ──────────────────────────────────────── */
.demo-card {
  background: #07070d;
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-border);
  overflow: hidden;
  height: 310px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: border-color var(--dur-mid) var(--ease-out),
              box-shadow var(--dur-mid) var(--ease-out),
              transform var(--dur-mid) var(--ease-spring);
  opacity: 0;
  transform: translateY(24px);
  will-change: transform, opacity;
}
.demo-card.card-visible {
  opacity: 1;
  transform: translateY(0);
}
.demo-card:hover {
  border-color: var(--c-border-glow);
  box-shadow: var(--glow-blue), var(--shadow-lg);
  transform: translateY(-8px) scale(1.015);
}

/* Subtle inner top glow on hover */
.demo-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--a-blue), var(--a-violet), transparent);
  opacity: 0;
  transition: opacity var(--dur-mid);
  z-index: 10;
}
.demo-card:hover::before { opacity: 1; }

/* ── Terminal Header ─────────────────────────────────────── */
.terminal-header {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  background: #0b0b12;
  border-bottom: 1px solid var(--c-border);
  min-height: 50px;
  flex-shrink: 0;
}
.terminal-controls {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}
.terminal-btn {
  width: 10px; height: 10px;
  border-radius: 50%;
  transition: transform var(--dur-fast), filter var(--dur-fast);
}
.terminal-btn:hover { transform: scale(1.3); filter: brightness(1.3); }
.close-btn    { background: #ff5f56; box-shadow: 0 0 4px #ff5f5680; }
.minimize-btn { background: #febc2e; box-shadow: 0 0 4px #febc2e80; }
.maximize-btn { background: #28c840; box-shadow: 0 0 4px #28c84080; }

.terminal-title {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--c-text);
  flex: 1;
}
.terminal-title i {
  color: var(--a-blue);
  font-size: 0.78rem;
}

.terminal-tool {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--c-text-3);
  border: 1px solid var(--c-border);
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(255,255,255,0.03);
  white-space: nowrap;
  flex-shrink: 0;
  transition: all var(--dur-mid);
}
.demo-card:hover .terminal-tool {
  border-color: var(--c-border-glow);
  color: var(--a-blue);
}

/* Interaction hint for 3D cube */
#interaction-hint {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.7rem;
  padding: 4px 10px;
}
.hint-icon { color: var(--a-blue); font-size: 0.65rem; }
.hint-text  { color: var(--c-text-3); }

/* ── Terminal Body ───────────────────────────────────────── */
.terminal-body {
  flex: 1;
  padding: 18px 20px;
  overflow: hidden;
  position: relative;
  background:
    radial-gradient(ellipse at 10% 80%, rgba(99,179,237,0.03) 0%, transparent 60%);
}

/* Row counter gutter */
.terminal-body::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 36px; height: 100%;
  background: rgba(255,255,255,0.015);
  border-right: 1px solid var(--c-border);
}

/* ── Code Lines ──────────────────────────────────────────── */
.code-line {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  padding-left: 44px;
  position: relative;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;

  opacity: 0;
  transform: translateX(-8px);
  transition: opacity 0.35s var(--ease-out), transform 0.35s var(--ease-out);
}
.code-line.visible { opacity: 1; transform: translateX(0); }

/* Line number */
.code-line::before {
  content: attr(data-line);
  position: absolute;
  left: 6px;
  color: var(--c-text-3);
  font-size: 0.65rem;
  width: 18px;
  text-align: right;
  user-select: none;
}

/* Syntax colours */
.code-line.comment  { color: #4a5a6a; font-style: italic; }
.code-line.keyword  { color: #63b3ed; }
.code-line.string   { color: #68d391; }
.code-line.function { color: #f687b3; }
.code-line.number   { color: #f6ad55; }
.code-line.variable { color: #c0cadb; }
.code-line.normal   { color: #8899aa; }

/* Blinking cursor */
.typewriter-cursor {
  display: inline-block;
  width: 7px; height: 0.9em;
  background: var(--a-blue);
  vertical-align: text-bottom;
  margin-left: 2px;
  border-radius: 1px;
  box-shadow: 0 0 8px var(--a-blue);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* ── Blender / Three.js Card ─────────────────────────────── */
.blender-demo-card {
  height: 400px;
}

#blender-model-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: #000;
  cursor: grab;
  touch-action: none;
}
#blender-model-container:active { cursor: grabbing; }

/* WebGL canvas */
#blender-model-container canvas { display: block; }

.blender-controls {
  position: absolute;
  bottom: 18px;
  left: 0; right: 0;
  display: flex;
  justify-content: center;
  gap: 10px;
  z-index: 10;
  padding: 0 16px;
}
.blender-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(99,179,237,0.25);
  background: rgba(5,5,10,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--c-text-2);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--dur-mid) var(--ease-spring);
  max-width: 130px;
  flex: 1;
  justify-content: center;
}
.blender-btn:hover {
  background: var(--a-blue);
  color: #000;
  border-color: var(--a-blue);
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 8px 24px rgba(99,179,237,0.4);
}

/* Extra controls (material / scale / spin) */
.blender-extra-controls {
  position: absolute;
  top: 14px; left: 14px;
  display: flex;
  gap: 8px;
  z-index: 10;
}
.extra-btn {
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 1px solid rgba(99,179,237,0.25);
  background: rgba(5,5,10,0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--c-text-2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  transition: all var(--dur-mid) var(--ease-spring);
}
.extra-btn:hover {
  background: var(--a-blue);
  color: #000;
  border-color: var(--a-blue);
  transform: scale(1.1) rotate(15deg);
  box-shadow: var(--glow-blue);
}

/* ── Footer fade ─────────────────────────────────────────── */
.footer-fade {
  height: 120px;
  background: linear-gradient(to bottom, transparent, var(--c-bg));
  pointer-events: none;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1200px) {
  .tools-grid  { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
  .skills-grid { grid-template-columns: repeat(auto-fill, minmax(125px, 1fr)); }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .back-button-container { top: 16px; left: 16px; }
  .back-button { padding: 9px 16px; font-size: 0.8rem; }

  .main-header { padding: 5.5rem 0 3.5rem; }
  .main-title { font-size: 2.4rem; }
  .title-subtext { font-size: 0.95rem; }

  .stat-item { padding: 12px 20px; }
  .stat-num  { font-size: 1.3rem; }

  .section { padding: 4rem 0; }
  .section-title { font-size: 1.7rem; }
  .section-header { margin-bottom: 2.5rem; }

  .tools-grid  { grid-template-columns: repeat(auto-fill, minmax(105px, 1fr)); gap: 10px; }
  .skills-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 10px; }

  .tool-item, .skill-item { padding: 18px 8px 14px; min-height: 110px; }
  .tool-icon, .skill-icon  { font-size: 1.7rem; margin-bottom: 9px; }
  .tool-name, .skill-name  { font-size: 0.75rem; }

  .demos-grid { grid-template-columns: 1fr; gap: 14px; }
  .demo-card  { height: 280px; }
  .blender-demo-card { height: 360px; }
  .terminal-header { padding: 10px 14px; min-height: 46px; }
  .blender-btn { padding: 7px 14px; font-size: 0.75rem; }
}

@media (max-width: 480px) {
  .back-button span { display: none; }
  .main-title { font-size: 2rem; letter-spacing: -0.02em; }
  .header-stats { flex-direction: row; }
  .stat-item { padding: 10px 14px; }
  .stat-num  { font-size: 1.2rem; }

  .tools-grid  { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .skills-grid { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .tool-item, .skill-item { padding: 14px 6px 12px; min-height: 96px; }
  .tool-icon, .skill-icon  { font-size: 1.5rem; margin-bottom: 7px; }
  .tool-name, .skill-name  { font-size: 0.7rem; }

  .demo-card  { height: 260px; }
  .blender-demo-card { height: 320px; }
  .code-line  { font-size: 0.65rem; padding-left: 38px; }
  .blender-btn { font-size: 0.72rem; padding: 6px 10px; max-width: 110px; }
  .skill-tabs { gap: 6px; }
  .skill-tab  { font-size: 0.75rem; padding: 5px 12px; }
}

@media (max-width: 360px) {
  .tools-grid  { grid-template-columns: repeat(2, 1fr); }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1400px) {
  .tools-grid  { grid-template-columns: repeat(7, 1fr); }
  .skills-grid { grid-template-columns: repeat(8, 1fr); }
  .demos-grid  { grid-template-columns: repeat(3, 1fr); }
}

/* ── Touch device overrides ───────────────────────────────── */
@media (hover: none) and (pointer: coarse) {
  .tool-item:hover, .skill-item:hover,
  .demo-card:hover, .blender-btn:hover {
    transform: none;
  }
  .tool-item:active, .skill-item:active { transform: scale(0.97); }
  .blender-btn:active { transform: scale(0.97); background: var(--a-blue); color: #000; }
}

/* ── Reduced motion ───────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}