/* ═══════════════════════════════════════════════════════════════
   SHARED DESIGN SYSTEM v2 — dongcmd.com
   Clean, minimal, premium. Inspired by natnu.design.
   ═══════════════════════════════════════════════════════════════ */

/* Inter loaded via <link> in HTML head (was @import — broke whole sheet in Chrome) */

/* ─── Variables: Dark (default) ─── */
:root, [data-theme="dark"] {
  --bg: #0a0a0f;
  --surface: rgba(255,255,255,0.03);
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.12);
  --text: #ffffff;
  --text2: #999999;
  --muted: #666666;
  --accent: #FF6D00;
  --accent2: #FF8A33;
  --nav-bg: rgba(10,10,15,0.6);
  --card-bg: rgba(255,255,255,0.06);
}

/* ─── Variables: Light ─── */
[data-theme="light"] {
  --bg: #fafafa;
  --surface: rgba(0,0,0,0.02);
  --border: rgba(0,0,0,0.06);
  --border-hover: rgba(0,0,0,0.12);
  --text: #0a0a0f;
  --text2: #666666;
  --muted: #999999;
  --nav-bg: rgba(250,250,250,0.7);
  --card-bg: rgba(0,0,0,0.04);
}

/* ─── Reset ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg); color: var(--text);
  line-height: 1.6; -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.3s ease;
}
a { color: inherit; text-decoration: none; }

/* ─── Particles ─── */
#tsparticles {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none; min-height: 100vh;
}
#tsparticles canvas { pointer-events: auto; }

/* Content above particles */
.nav, main, section, footer, .page-content { position: relative; z-index: 1; }

/* ─── Navigation — thin, clean ─── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background 0.4s;
}
.nav-inner {
  max-width: 1000px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 56px;
}
.nav-logo {
  font-size: 18px; font-weight: 700; letter-spacing: -0.5px;
  color: var(--text); transition: opacity 0.2s;
}
.nav-logo:hover { opacity: 0.7; }
.nav-logo span { color: var(--accent); }
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
  font-size: 14px; font-weight: 500; color: var(--text2);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--text); }
.nav-actions { display: flex; gap: 12px; align-items: center; }

/* Theme Toggle — iOS-style slide switch */
.theme-toggle {
  position: relative;
  width: 48px; height: 28px;
  background: rgba(120,120,128,0.32); border: none;
  border-radius: 14px; cursor: pointer; padding: 0;
  transition: background 0.3s ease;
}
.theme-toggle::before {
  content: '';
  position: absolute; left: 2px; top: 2px;
  width: 24px; height: 24px; border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
  transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
[data-theme="dark"] .theme-toggle {
  background: var(--accent);
}
[data-theme="dark"] .theme-toggle::before {
  left: 22px;
}

/* ─── Buttons — restrained ─── */
.nav-cta, .btn-primary {
  background: var(--accent); color: #fff; border: none;
  border-radius: 10px; padding: 8px 20px;
  font-size: 14px; font-weight: 600; cursor: pointer;
  font-family: inherit;
  transition: all 0.2s ease;
}
.nav-cta:hover, .btn-primary:hover {
  background: var(--accent2); transform: scale(1.02);
}
.nav-cta:active, .btn-primary:active {
  transform: scale(0.98); transition-duration: 0.1s;
}

.hero-cta {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: #fff; border: none;
  border-radius: 10px; padding: 14px 32px;
  font-size: 16px; font-weight: 600; cursor: pointer;
  font-family: inherit;
  transition: all 0.2s ease;
}
.hero-cta:hover { background: var(--accent2); transform: scale(1.02); }
.hero-cta:active { transform: scale(0.98); }
.hero-cta svg { width: 18px; height: 18px; transition: transform 0.2s; }
.hero-cta:hover svg { transform: translateX(3px); }

/* ─── Hero ─── */
.hero {
  min-height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
  padding: 160px 24px 120px;
}
.hero h1 {
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 800; letter-spacing: -3px; line-height: 1.05;
  margin-bottom: 24px; max-width: 800px;
}
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text2); max-width: 500px; margin-bottom: 48px;
  line-height: 1.7;
}

/* ─── Sections ─── */
.section-pad { padding: 120px 0; }
.container { max-width: 1000px; margin: 0 auto; padding: 0 24px; }

.section-label {
  font-size: 13px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 2px; color: var(--accent); margin-bottom: 12px;
  text-align: center;
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 700; letter-spacing: -1.5px; margin-bottom: 64px;
  text-align: center;
}

/* ─── Cards — minimal, barely styled ─── */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px; padding: 40px;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: border-color 0.3s ease, background 0.3s ease;
}
.card:hover {
  border-color: var(--border-hover);
}
.card h3 {
  font-size: 18px; font-weight: 700; letter-spacing: -0.3px; margin-bottom: 8px;
}
.card p { font-size: 14px; color: var(--text2); line-height: 1.7; }
.card .tag {
  display: inline-block; margin-top: 16px;
  font-size: 12px; font-weight: 500; color: var(--text2);
}

/* ─── Footer ─── */
.footer {
  text-align: center; padding: 48px 24px;
  border-top: 1px solid var(--border);
  color: var(--muted); font-size: 13px;
  position: relative; z-index: 1;
}
.footer a { color: var(--text2); transition: color 0.2s; }
.footer a:hover { color: var(--accent); }

/* ─── Scroll Animations (refined — less movement) ─── */
.fade-up {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

.fade-left {
  opacity: 0; transform: translateX(-20px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.fade-left.visible { opacity: 1; transform: translateX(0); }

.fade-right {
  opacity: 0; transform: translateX(20px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.fade-right.visible { opacity: 1; transform: translateX(0); }

.scale-in {
  opacity: 0; transform: scale(0.95);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.scale-in.visible { opacity: 1; transform: scale(1); }

/* Stagger container — children auto-delay */
.stagger > * { transition-delay: calc(var(--i, 0) * 0.07s); }

/* ─── Scroll Reveal ─── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}
.reveal-right {
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}
.reveal-scale {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Custom cursor — disabled for cleaner native UX */
.cursor-dot, .cursor-ring { display: none !important; }

/* ─── Page Transition Bar ─── */
.page-transition-bar {
  position: fixed;
  top: 0; left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2, #ff9800));
  z-index: 99999;
  transition: width 0.2s ease;
  box-shadow: 0 0 10px rgba(255,109,0,0.5);
  pointer-events: none;
}
.page-transition-bar.loading { width: 80%; transition: width 8s cubic-bezier(0.1, 0.05, 0, 1); }
.page-transition-bar.done { width: 100%; transition: width 0.2s ease; }
.page-transition-bar.hide { opacity: 0; transition: opacity 0.3s ease 0.2s; }

/* Theme transition */
.theme-transitioning * { transition-duration: 0.4s !important; }

/* ─── Coming Soon ─── */
.coming-soon {
  min-height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
  padding: 160px 24px 120px;
}
.coming-soon .icon { font-size: 48px; margin-bottom: 24px; opacity: 0.6; }
.coming-soon h1 {
  font-size: clamp(2rem, 4vw, 3rem); font-weight: 700;
  letter-spacing: -1.5px; margin-bottom: 12px;
}
.coming-soon p { color: var(--text2); font-size: 16px; max-width: 420px; line-height: 1.7; }
.coming-soon .back {
  margin-top: 32px; color: var(--text2); font-size: 14px;
  font-weight: 500; transition: color 0.2s;
}
.coming-soon .back:hover { color: var(--accent); }

/* ─── Command Palette ─── */
.cmd-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  z-index: 100000;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 20vh;
  animation: cmdOverlayIn 0.15s ease;
}
.cmd-overlay.active { display: flex; }
@keyframes cmdOverlayIn { from { opacity: 0; } to { opacity: 1; } }

.cmd-palette {
  background: rgba(20,20,30,0.98);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px;
  width: 90%;
  max-width: 520px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  overflow: hidden;
  animation: cmdPaletteIn 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes cmdPaletteIn {
  from { opacity: 0; transform: scale(0.95) translateY(-10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.cmd-input-wrap {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.cmd-input-wrap svg { color: var(--muted); flex-shrink: 0; }
.cmd-input {
  flex: 1; background: none; border: none; outline: none;
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 16px; color: var(--text);
}
.cmd-input::placeholder { color: var(--muted); }
.cmd-kbd { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--muted); background: rgba(255,255,255,0.06); border-radius: 4px; padding: 2px 6px; }

.cmd-results {
  max-height: 300px; overflow-y: auto;
  padding: 8px;
}
.cmd-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px; border-radius: 8px;
  cursor: pointer; transition: background 0.1s;
  font-size: 14px; color: var(--text2);
}
.cmd-item:hover, .cmd-item.active {
  background: rgba(255,255,255,0.06);
  color: var(--text);
}
.cmd-item-icon { font-size: 18px; }
.cmd-item-desc { font-size: 12px; color: var(--muted); margin-left: auto; }

/* Light theme command palette */
[data-theme="light"] .cmd-palette { background: rgba(255,255,255,0.98); border-color: rgba(0,0,0,0.1); box-shadow: 0 20px 60px rgba(0,0,0,0.15); }
[data-theme="light"] .cmd-input-wrap { border-bottom-color: rgba(0,0,0,0.06); }
[data-theme="light"] .cmd-kbd { background: rgba(0,0,0,0.06); }
[data-theme="light"] .cmd-item:hover, [data-theme="light"] .cmd-item.active { background: rgba(0,0,0,0.04); }

/* ─── Ripple Effect ─── */
.ripple {
  position: relative; overflow: hidden;
}
.ripple::after {
  content: '';
  position: absolute;
  width: 100%; height: 100%;
  top: 0; left: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
  transform: scale(0);
  opacity: 0;
  pointer-events: none;
}
.ripple:active::after {
  transform: scale(2);
  opacity: 1;
  transition: 0s;
}

/* ─── Focus ─── */
:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px;
}

/* ─── Tablet (iPad portrait ~768–1024px) ─── */
@media (min-width: 769px) and (max-width: 1024px) {
  .nav-inner { padding: 0 20px; height: 52px; }
  .nav-links { gap: 20px; }
  .nav-links a { font-size: 13px; }
  .hero { padding: 140px 24px 100px; }
  .hero h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
  .section-pad { padding: 80px 0; }
  .container { max-width: 100%; padding: 0 20px; }
  .card { padding: 28px; }
  .cmd-palette { max-width: 480px; }
}

/* ─── Mobile ─── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero { padding: 120px 20px 80px; }
  .section-pad { padding: 80px 0; }
}

/* ─── Reduced Motion ─── */
@media (prefers-reduced-motion: reduce) {
  .fade-up, .fade-left, .fade-right, .scale-in,
  .reveal, .reveal-left, .reveal-right, .reveal-scale {
    opacity: 1; transform: none; transition: none;
  }
  .cursor-dot, .cursor-ring { display: none !important; }
  .page-transition-bar { display: none !important; }
  * { animation: none !important; transition-duration: 0s !important; }
}