/* ============================================================
   MAIN.CSS — Design System Tokens, Resets, Base Layout
   Portfolio: Amrit Kandel
   ============================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ── Design Tokens ── */
:root {
  /* Colors */
  --clr-bg:        #080c14;
  --clr-surface:   #0d1220;
  --clr-surface2:  #111827;
  --clr-border:    rgba(99,115,169,0.18);
  --clr-border2:   rgba(99,115,169,0.28);

  --clr-text:      #e8edf8;
  --clr-text-dim:  #8892a4;
  --clr-text-mute: #4a5568;

  /* Brand gradient — electric cyan → violet */
  --clr-accent:    #38bdf8;          /* sky-400 */
  --clr-accent2:   #818cf8;          /* indigo-400 */
  --clr-accent3:   #c084fc;          /* purple-400 */
  --clr-green:     #34d399;          /* emerald-400 */
  --clr-amber:     #fbbf24;

  --grad-brand: linear-gradient(135deg, var(--clr-accent) 0%, var(--clr-accent2) 50%, var(--clr-accent3) 100%);
  --grad-subtle: linear-gradient(135deg, rgba(56,189,248,0.08) 0%, rgba(129,140,248,0.08) 100%);
  --grad-card:   linear-gradient(145deg, #0d1424 0%, #0a1020 100%);

  /* Typography */
  --ff-sans:  'Space Grotesk', 'Inter', system-ui, sans-serif;
  --ff-mono:  'JetBrains Mono', 'Fira Code', monospace;

  --fs-xs:   0.75rem;
  --fs-sm:   0.875rem;
  --fs-base: 1rem;
  --fs-lg:   1.125rem;
  --fs-xl:   1.25rem;
  --fs-2xl:  1.5rem;
  --fs-3xl:  1.875rem;
  --fs-4xl:  2.25rem;
  --fs-5xl:  3rem;
  --fs-6xl:  3.75rem;
  --fs-7xl:  4.5rem;

  /* Spacing */
  --sp-1: 0.25rem; --sp-2: 0.5rem;  --sp-3: 0.75rem;
  --sp-4: 1rem;    --sp-5: 1.25rem; --sp-6: 1.5rem;
  --sp-8: 2rem;    --sp-10: 2.5rem; --sp-12: 3rem;
  --sp-16: 4rem;   --sp-20: 5rem;   --sp-24: 6rem;
  --sp-32: 8rem;

  /* Radii */
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  28px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg:  0 12px 40px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 32px rgba(56,189,248,0.18);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 150ms;
  --dur-base: 280ms;
  --dur-slow: 480ms;

  /* Layout */
  --max-w: 1140px;
  --nav-h: 68px;
}

/* Light mode overrides */
html.light {
  --clr-bg:        #f5f7fc;
  --clr-surface:   #ffffff;
  --clr-surface2:  #edf0f7;
  --clr-border:    rgba(60,80,150,0.13);
  --clr-border2:   rgba(60,80,150,0.22);
  --clr-text:      #0d1224;
  --clr-text-dim:  #4a5578;
  --clr-text-mute: #9ba3b5;
  --grad-card:     linear-gradient(145deg, #ffffff 0%, #f0f3fb 100%);
  --shadow-glow:   0 0 32px rgba(56,189,248,0.1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--ff-sans);
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--clr-text);
  background: var(--clr-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--clr-bg); }
::-webkit-scrollbar-thumb { background: rgba(99,115,169,0.3); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: rgba(99,115,169,0.5); }

/* ── Selection ── */
::selection { background: rgba(56,189,248,0.25); color: var(--clr-text); }

/* ── Layout helpers ── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--sp-6);
}

@media (max-width: 640px) {
  .container { padding-inline: var(--sp-4); }
}

/* ── Grain overlay ── */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' 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");
}

/* ── Section utilities ── */
.section { padding-block: var(--sp-24); }

.sec-head {
  display: flex;
  align-items: baseline;
  gap: var(--sp-4);
  margin-bottom: var(--sp-12);
  flex-wrap: wrap;
}

.sec-index {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--clr-accent);
  opacity: 0.7;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  flex-shrink: 0;
}

.sec-head h2 {
  font-size: clamp(var(--fs-3xl), 4vw, var(--fs-5xl));
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  flex: 1;
}

.sec-meta {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--clr-text-mute);
  margin-left: auto;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

/* ── Gradient text ── */
.grad-text {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Tag/Badge ── */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: var(--sp-1) var(--sp-3);
  background: rgba(56,189,248,0.08);
  border: 1px solid rgba(56,189,248,0.18);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-family: var(--ff-mono);
  color: var(--clr-accent);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--radius-full);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all var(--dur-base) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--grad-brand);
  color: #fff;
  box-shadow: 0 0 24px rgba(56,189,248,0.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 36px rgba(56,189,248,0.4);
}

.btn-outline {
  border: 1px solid var(--clr-border2);
  color: var(--clr-text);
  background: rgba(255,255,255,0.03);
}
.btn-outline:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  background: rgba(56,189,248,0.05);
  transform: translateY(-2px);
}

/* ── Icon button ── */
.icon-btn {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border);
  color: var(--clr-text-dim);
  transition: all var(--dur-fast) var(--ease-out);
  background: rgba(255,255,255,0.03);
}
.icon-btn:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  background: rgba(56,189,248,0.07);
}
.icon-btn .material-symbols-outlined { font-size: 20px; }

/* ── Animations ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.85); }
}
@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-10px); }
}
@keyframes shimmer {
  0%   { background-position: -200% center; }
  100% { background-position:  200% center; }
}
@keyframes scanline {
  from { top: -100%; }
  to   { top: 200%; }
}
@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 20px rgba(56,189,248,0.2); }
  50%       { box-shadow: 0 0 40px rgba(56,189,248,0.5); }
}

/* ── Reveal on scroll ── */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 100ms; }
.reveal-delay-2 { transition-delay: 200ms; }
.reveal-delay-3 { transition-delay: 300ms; }
.reveal-delay-4 { transition-delay: 400ms; }

/* ── Marquee ── */
.marquee {
  overflow: hidden;
  padding-block: var(--sp-6);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
  background: var(--clr-surface);
}
.marquee-track {
  display: flex;
  gap: var(--sp-8);
  width: max-content;
  animation: marquee 28s linear infinite;
}
.marquee-track:hover { animation-play-state: paused; }
.marquee-track span {
  font-family: var(--ff-mono);
  font-size: var(--fs-sm);
  color: var(--clr-text-dim);
  white-space: nowrap;
  letter-spacing: 0.05em;
}
.marquee-track span::before {
  content: '◆ ';
  color: var(--clr-accent);
  font-size: 0.6em;
}

/* ── Availability badge ── */
.avail-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-4);
  background: rgba(52,211,153,0.08);
  border: 1px solid rgba(52,211,153,0.2);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-family: var(--ff-mono);
  color: var(--clr-green);
  margin-bottom: var(--sp-6);
}
.avail-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--clr-green);
  animation: pulse-dot 2s ease-in-out infinite;
}

/* ── Divider ── */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--clr-border2) 30%, var(--clr-border2) 70%, transparent);
  margin-block: var(--sp-2);
}

/* ── Grid BG pattern ── */
.grid-bg {
  background-image: 
    linear-gradient(rgba(99,115,169,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99,115,169,0.05) 1px, transparent 1px);
  background-size: 60px 60px;
}