/* ═══════════════════════════════════════════════════════════════════════════
   DESIGN SYSTEM — ashikmuhammed.com
   Single source of truth for all pages
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Google Fonts ─────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Geist+Mono:wght@400;500;600&display=swap');

/* ── Tokens ───────────────────────────────────────────────────────────────── */
:root {
  /* Backgrounds */
  --bg:        #060B16;
  --bg-raised: #0C1523;
  --bg-card:   #0F1C2E;
  --bg-hover:  #162235;

  /* Borders */
  --border:     rgba(255,255,255,.06);
  --border-md:  rgba(255,255,255,.1);
  --border-lg:  rgba(255,255,255,.16);

  /* Accents */
  --cyan:    #22D3EE;
  --cyan-dim: rgba(34,211,238,.12);
  --amber:   #D97706;
  --amber-dim: rgba(217,119,6,.12);
  --purple:  #A855F7;
  --purple-dim: rgba(168,85,247,.12);
  --green:   #10B981;
  --green-dim: rgba(16,185,129,.12);
  --red:     #F87171;
  --red-dim:  rgba(248,113,113,.1);

  /* Text */
  --text-1: #F1F5F9;
  --text-2: #94A3B8;
  --text-3: #475569;

  /* Typography */
  --font:  'Inter', system-ui, sans-serif;
  --mono:  'Geist Mono', 'JetBrains Mono', monospace;

  /* Spacing scale */
  --s1: .25rem;   /* 4px  */
  --s2: .5rem;    /* 8px  */
  --s3: .75rem;   /* 12px */
  --s4: 1rem;     /* 16px */
  --s5: 1.5rem;   /* 24px */
  --s6: 2rem;     /* 32px */
  --s7: 3rem;     /* 48px */
  --s8: 4rem;     /* 64px */
  --s9: 6rem;     /* 96px */

  /* Radius */
  --r-sm:  6px;
  --r-md:  10px;
  --r-lg:  16px;
  --r-xl:  20px;
  --r-full: 9999px;

  /* Motion */
  --ease:   cubic-bezier(.23, 1, .32, 1);
  --spring: cubic-bezier(.34, 1.56, .64, 1);
  --dur-fast:   150ms;
  --dur-base:   250ms;
  --dur-slow:   400ms;

  /* Layout */
  --max-w:   1200px;
  --nav-h:   64px;
}

/* ── Light mode overrides ─────────────────────────────────────────────────── */
body.light {
  --bg:        #F8FAFC;
  --bg-raised: #F1F5F9;
  --bg-card:   #FFFFFF;
  --bg-hover:  #E2E8F0;
  --border:     rgba(0,0,0,.07);
  --border-md:  rgba(0,0,0,.12);
  --border-lg:  rgba(0,0,0,.2);
  --text-1:    #0F172A;
  --text-2:    #475569;
  --text-3:    #94A3B8;
  --cyan:      #0284C7;
  --cyan-dim:  rgba(2,132,199,.1);
  --amber:     #B45309;
  --amber-dim: rgba(180,83,9,.1);
  --purple:    #7C3AED;
  --purple-dim: rgba(124,58,237,.1);
  --green:     #059669;
  --green-dim: rgba(5,150,105,.1);
}

/* ── Reset ────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background:  var(--bg);
  color:       var(--text-1);
  font-size:   16px;
  line-height: 1.6;
  overflow-x:  hidden;
  cursor:      none;
  -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; display: block; }
button { font-family: inherit; }
a { color: inherit; }
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

/* ── Scrollbar ────────────────────────────────────────────────────────────── */
::-webkit-scrollbar       { width: 3px; height: 3px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-md); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--cyan); }

/* ── Selection ────────────────────────────────────────────────────────────── */
::selection { background: var(--cyan-dim); color: var(--text-1); }

/* ── Cursor ───────────────────────────────────────────────────────────────── */
#ds-cursor {
  width: 8px; height: 8px;
  background: var(--cyan);
  border-radius: 50%;
  position: fixed; top: 0; left: 0;
  pointer-events: none; z-index: 9999;
  mix-blend-mode: screen;
  transition: transform var(--dur-fast);
  will-change: transform;
}
#ds-cursor-ring {
  width: 28px; height: 28px;
  border: 1.5px solid rgba(34,211,238,.45);
  border-radius: 50%;
  position: fixed; top: 0; left: 0;
  pointer-events: none; z-index: 9998;
  transition: width var(--dur-base) var(--ease),
              height var(--dur-base) var(--ease),
              border-color var(--dur-base);
  will-change: transform;
}
body.light #ds-cursor { mix-blend-mode: normal; opacity: .7; }

/* ── Nav ──────────────────────────────────────────────────────────────────── */
.ds-nav {
  position: fixed; top: 0; width: 100%; height: var(--nav-h);
  z-index: 400;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--s7);
  transition: background var(--dur-slow), box-shadow var(--dur-slow), backdrop-filter var(--dur-slow);
}
.ds-nav.scrolled {
  background: rgba(6,11,22,.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border);
}
body.light .ds-nav.scrolled {
  background: rgba(248,250,252,.9);
  box-shadow: 0 1px 0 var(--border-md);
}
.ds-nav-logo {
  font-size: .8rem; font-weight: 800;
  letter-spacing: .12em; text-transform: uppercase;
  text-decoration: none; color: var(--text-1);
  display: flex; align-items: center; gap: .4rem;
}
.ds-nav-logo-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}
.ds-nav-links {
  display: flex; gap: .15rem; list-style: none; align-items: center;
}
.ds-nav-links a {
  font-size: .8rem; font-weight: 500;
  color: var(--text-2); text-decoration: none;
  padding: .4rem .75rem; border-radius: var(--r-md);
  transition: color var(--dur-fast), background var(--dur-fast);
  letter-spacing: .01em;
}
.ds-nav-links a:hover  { color: var(--text-1); background: var(--bg-hover); }
.ds-nav-links a.active { color: var(--cyan); background: var(--cyan-dim); }
.ds-nav-theme {
  width: 32px; height: 32px;
  background: none; border: 1px solid var(--border-md);
  border-radius: var(--r-md); color: var(--text-2);
  font-size: .85rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--dur-fast); margin-left: .5rem;
}
.ds-nav-theme:hover { border-color: var(--cyan); color: var(--cyan); }
.ds-burger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: none; padding: 4px;
}
.ds-burger span {
  width: 20px; height: 1.5px; background: var(--text-2);
  display: block; border-radius: 1px;
  transition: all var(--dur-base);
}

/* ── Mobile menu ──────────────────────────────────────────────────────────── */
.ds-mob-menu {
  position: fixed; inset: 0;
  background: rgba(6,11,22,.97);
  backdrop-filter: blur(24px);
  z-index: 399;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 2.5rem;
  opacity: 0; pointer-events: none;
  transition: opacity var(--dur-base);
}
.ds-mob-menu.open { opacity: 1; pointer-events: all; }
.ds-mob-menu a {
  font-size: 1.5rem; font-weight: 700;
  color: var(--text-1); text-decoration: none; letter-spacing: .05em;
  transition: color var(--dur-fast);
}
.ds-mob-menu a:hover, .ds-mob-menu a.active { color: var(--cyan); }
body.light .ds-mob-menu { background: rgba(248,250,252,.97); }

/* ── Footer ───────────────────────────────────────────────────────────────── */
.ds-footer {
  border-top: 1px solid var(--border);
  padding: var(--s5) var(--s7);
  display: flex; align-items: center;
  justify-content: space-between;
  flex-wrap: wrap; gap: var(--s4);
}
.ds-footer-copy {
  font-family: var(--mono); font-size: .65rem;
  color: var(--text-3); letter-spacing: .04em;
}
.ds-footer-links { display: flex; gap: var(--s5); }
.ds-footer-links a {
  font-size: .78rem; color: var(--text-3);
  text-decoration: none; font-weight: 500;
  transition: color var(--dur-fast);
}
.ds-footer-links a:hover { color: var(--text-1); }
.ds-footer-live {
  display: flex; align-items: center; gap: .4rem;
  font-family: var(--mono); font-size: .65rem; color: var(--green);
}
.ds-footer-live-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green); animation: ds-blink 2s infinite;
}
@keyframes ds-blink { 0%,100%{opacity:1} 50%{opacity:.2} }

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font); font-size: .85rem; font-weight: 600;
  text-decoration: none; border: none; cursor: pointer;
  padding: .65rem 1.4rem; border-radius: var(--r-md);
  transition: all var(--dur-base) var(--ease);
  letter-spacing: .01em; white-space: nowrap;
}
.btn-primary {
  background: var(--cyan); color: #060B16;
}
.btn-primary:hover { opacity: .88; transform: translateY(-1px); box-shadow: 0 8px 24px rgba(34,211,238,.25); }
.btn-outline {
  background: transparent; color: var(--text-1);
  border: 1px solid var(--border-md);
}
.btn-outline:hover { border-color: var(--border-lg); background: var(--bg-hover); }
.btn-ghost {
  background: transparent; color: var(--text-2);
  border: 1px solid transparent;
}
.btn-ghost:hover { color: var(--text-1); background: var(--bg-hover); }
.btn-sm { font-size: .78rem; padding: .45rem 1rem; }
.btn-lg { font-size: .95rem; padding: .85rem 1.8rem; border-radius: var(--r-lg); }

/* ── Cards ────────────────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--r-lg);
  transition: border-color var(--dur-base), transform var(--dur-slow) var(--ease), box-shadow var(--dur-slow);
}
.card:hover {
  border-color: var(--border-md);
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(0,0,0,.3);
}
.card-interactive { cursor: pointer; }

/* ── Section labels ───────────────────────────────────────────────────────── */
.eyebrow {
  font-family: var(--mono); font-size: .65rem;
  letter-spacing: .2em; text-transform: uppercase;
  color: var(--cyan); display: flex; align-items: center; gap: .6rem;
  margin-bottom: var(--s4);
}
.eyebrow::before {
  content: ''; width: 16px; height: 1px;
  background: var(--cyan); flex-shrink: 0;
}

/* ── Badges ───────────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center; gap: .35rem;
  font-family: var(--mono); font-size: .62rem; font-weight: 500;
  padding: .22rem .65rem; border-radius: var(--r-full);
  border: 1px solid; letter-spacing: .06em;
}
.badge-cyan   { color: var(--cyan);   border-color: rgba(34,211,238,.3);  background: var(--cyan-dim); }
.badge-amber  { color: var(--amber);  border-color: rgba(217,119,6,.3);   background: var(--amber-dim); }
.badge-purple { color: var(--purple); border-color: rgba(168,85,247,.3);  background: var(--purple-dim); }
.badge-green  { color: var(--green);  border-color: rgba(16,185,129,.3);  background: var(--green-dim); }
.badge-red    { color: var(--red);    border-color: rgba(248,113,113,.25);background: var(--red-dim); }

/* ── Form elements ────────────────────────────────────────────────────────── */
.ds-label {
  font-family: var(--mono); font-size: .62rem;
  text-transform: uppercase; letter-spacing: .12em;
  color: var(--text-2); display: block; margin-bottom: .4rem;
}
.ds-input, .ds-textarea, .ds-select {
  width: 100%; font-family: var(--font); font-size: .9rem;
  background: var(--bg-raised); border: 1px solid var(--border-md);
  color: var(--text-1); padding: .7rem 1rem;
  border-radius: var(--r-md); outline: none;
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
}
.ds-input:focus, .ds-textarea:focus, .ds-select:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34,211,238,.1);
}
.ds-input::placeholder, .ds-textarea::placeholder { color: var(--text-3); }
.ds-textarea { resize: vertical; min-height: 120px; }
.ds-select { cursor: pointer; }
.ds-select option { background: var(--bg-raised); }

/* ── Toast ────────────────────────────────────────────────────────────────── */
.ds-toast {
  position: fixed; bottom: 2rem; left: 50%;
  transform: translateX(-50%) translateY(80px);
  font-family: var(--mono); font-size: .72rem; letter-spacing: .06em;
  padding: .7rem 1.8rem; border-radius: var(--r-md);
  z-index: 9990; opacity: 0; white-space: nowrap;
  transition: all var(--dur-slow) var(--ease); pointer-events: none;
  max-width: 90vw; text-align: center;
}
.ds-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.ds-toast.ok   { background: var(--green-dim); border: 1px solid rgba(16,185,129,.4); color: var(--green); }
.ds-toast.fail { background: var(--red-dim);   border: 1px solid rgba(248,113,113,.4); color: var(--red); }
.ds-toast.info { background: var(--cyan-dim);  border: 1px solid rgba(34,211,238,.35); color: var(--cyan); }

/* ── Progress bar (page scroll) ──────────────────────────────────────────── */
#ds-progress {
  position: fixed; top: 0; left: 0; height: 2px;
  background: var(--cyan); z-index: 9997;
  width: 0%; transition: width .1s linear;
  box-shadow: 0 0 8px rgba(34,211,238,.6);
}

/* ── Back to top ──────────────────────────────────────────────────────────── */
#ds-btt {
  position: fixed; bottom: 2rem; right: 2rem; z-index: 300;
  width: 38px; height: 38px;
  background: var(--bg-card); border: 1px solid var(--border-md);
  border-radius: var(--r-md); color: var(--text-2);
  display: flex; align-items: center; justify-content: center;
  font-size: .85rem; cursor: pointer;
  opacity: 0; transform: translateY(8px);
  transition: all var(--dur-base); pointer-events: none;
}
#ds-btt.visible { opacity: 1; transform: none; pointer-events: all; }
#ds-btt:hover { border-color: var(--cyan); color: var(--cyan); background: var(--bg-hover); }

/* ── Fade-in observer ─────────────────────────────────────────────────────── */
.ds-fade { opacity: 0; transform: translateY(16px); transition: opacity .55s var(--ease), transform .55s var(--ease); }
.ds-fade.in { opacity: 1; transform: none; }
.ds-fade-delay-1 { transition-delay: .08s; }
.ds-fade-delay-2 { transition-delay: .16s; }
.ds-fade-delay-3 { transition-delay: .24s; }
.ds-fade-delay-4 { transition-delay: .32s; }

/* ── Layout helpers ───────────────────────────────────────────────────────── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--s7); }
.section   { padding: var(--s9) 0; }
.section-sm { padding: var(--s7) 0; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s6); }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: var(--s5); }
.grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: var(--s5); }
.flex-between { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--s4); }
.divider { height: 1px; background: var(--border); }

/* ── Typography ───────────────────────────────────────────────────────────── */
.text-display { font-size: clamp(2.5rem, 5.5vw, 4.5rem); font-weight: 800; line-height: 1.06; letter-spacing: -.03em; }
.text-h1      { font-size: clamp(2rem,   4vw,   3rem);   font-weight: 800; line-height: 1.1;  letter-spacing: -.025em; }
.text-h2      { font-size: clamp(1.4rem, 2.5vw, 1.9rem); font-weight: 700; line-height: 1.2;  letter-spacing: -.02em; }
.text-h3      { font-size: 1.2rem; font-weight: 600; line-height: 1.3; }
.text-body    { font-size: .95rem; color: var(--text-2); line-height: 1.75; font-weight: 300; }
.text-small   { font-size: .8rem;  color: var(--text-2); }
.text-mono    { font-family: var(--mono); font-size: .78rem; color: var(--text-2); }
.text-gradient { background: linear-gradient(135deg, var(--cyan), var(--purple)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.text-amber   { color: var(--amber); }
.text-cyan    { color: var(--cyan); }
.text-muted   { color: var(--text-3); }

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .container  { padding: 0 var(--s5); }
  .section    { padding: var(--s7) 0; }
  .ds-nav     { padding: 0 var(--s5); }
  .ds-footer  { padding: var(--s5); }
  .ds-nav-links, .ds-nav-theme { display: none; }
  .ds-burger  { display: flex; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .text-display { font-size: clamp(2rem, 8vw, 3rem); }
  #ds-btt { bottom: 1.2rem; right: 1.2rem; }
}
@media (max-width: 600px) {
  .container { padding: 0 var(--s4); }
  .ds-nav    { padding: 0 var(--s4); }
  .ds-footer { flex-direction: column; align-items: flex-start; }
}