/* ============================================================
   TAHMID.DEV — Design System
   Shared across all pages
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,400;0,500;0,600;1,400&family=Syne:wght@700;800&display=swap');

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

/* ── Tokens ── */
:root {
  --bg:          #09090b;
  --bg-raised:   #0f0f12;
  --bg-panel:    #131316;
  --bg-subtle:   #1a1a1e;
  --border:      rgba(255,255,255,0.055);
  --border-md:   rgba(255,255,255,0.10);
  --border-hi:   rgba(255,255,255,0.16);
  --text:        #eae8e3;
  --text-2:      #8d8d97;
  --text-3:      #6d6d7b;
  --accent:      #c9ba9b;
  --accent-dim:  rgba(201,186,155,0.08);
  --accent-glow: rgba(201,186,155,0.04);
  --green:       #4aaa6a;
  --green-dim:   rgba(74,170,106,0.10);
  --red:         #d05a5a;
  --nav-bg:      rgba(9,9,11,0.94);

  --mono: 'IBM Plex Mono', 'Courier New', monospace;
  --display: 'Syne', 'Helvetica Neue', sans-serif;
  --sans: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

[data-theme="light"] {
  --bg:          #f7f5f0;
  --bg-raised:   #edeae2;
  --bg-panel:    #e5e1d8;
  --bg-subtle:   #ddd8ce;
  --border:      rgba(0,0,0,0.08);
  --border-md:   rgba(0,0,0,0.13);
  --border-hi:   rgba(0,0,0,0.20);
  --text:        #1c1a15;
  --text-2:      #5c5950;
  --text-3:      #888480;
  --accent:      #7a6642;
  --accent-dim:  rgba(122,102,66,0.08);
  --accent-glow: rgba(122,102,66,0.04);
  --green:       #2a7045;
  --green-dim:   rgba(42,112,69,0.10);
  --red:         #a03535;
  --nav-bg:      rgba(247,245,240,0.95);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ── Nav ── */
#site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  height: 52px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 40px;
  border-bottom: 0.5px solid var(--border);
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
}
.nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 12px; color: var(--accent);
  letter-spacing: .1em; text-decoration: none;
}
.nav-brand-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green);
  animation: pulse-dot 3s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%,100% { opacity:1; transform:scale(1); }
  50%      { opacity:.35; transform:scale(.7); }
}
.nav-links {
  display: flex; gap: 0;
}
.nav-link {
  font-size: 11px; color: var(--text-3); letter-spacing: .1em;
  text-transform: uppercase; text-decoration: none;
  padding: 0 16px; height: 52px;
  display: flex; align-items: center;
  border-bottom: 1.5px solid transparent;
  transition: color .15s, border-color .15s;
}
.nav-link:hover { color: var(--text-2); }
.nav-link.active { color: var(--text); border-bottom-color: var(--accent); }
.nav-right {
  display: flex; align-items: center; gap: 12px;
}
.nav-clock {
  font-family: var(--mono); font-size: 10px; color: var(--text-2);
  letter-spacing: .06em;
}
.nav-badge {
  font-family: var(--mono); font-size: 10px; color: var(--green);
  border: 0.5px solid rgba(74,170,106,.22);
  padding: 3px 10px; letter-spacing: .08em;
}

/* ── Footer ── */
#site-footer {
  border-top: 0.5px solid var(--border);
  padding: 0 40px;
  height: 40px;
  display: flex; align-items: center; justify-content: space-between;
  background: var(--bg);
}
.footer-left {
  display: flex; align-items: center; gap: 24px;
}
.footer-item {
  font-family: var(--mono); font-size: 10px; color: var(--text-3);
  letter-spacing: .08em;
}
.footer-item span { color: var(--text-2); margin-left: 6px; }
.footer-links { display: flex; gap: 20px; }
.footer-links a {
  font-family: var(--mono); font-size: 10px; color: var(--text-3);
  text-decoration: none; letter-spacing: .06em;
  transition: color .15s;
}
.footer-links a:hover { color: var(--accent); }

/* ── Reusable utilities ── */
.section-label {
  font-family: var(--mono); font-size: 9px; color: var(--text-3);
  letter-spacing: .2em; text-transform: uppercase;
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 24px;
}
.section-label::after {
  content: ''; flex: 1; height: 0.5px; background: var(--border);
}

.eyebrow {
  font-family: var(--mono); font-size: 9px; color: var(--text-3);
  letter-spacing: .2em; text-transform: uppercase;
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 12px;
}
.eyebrow::before { content:''; width:18px; height:.5px; background:var(--text-3); display:block; }

.tag {
  font-family: var(--mono); font-size: 9px; letter-spacing: .06em;
  padding: 2px 8px; border: 0.5px solid var(--border-md);
  color: var(--text-2); display: inline-block;
}
.tag-green { border-color: rgba(74,170,106,.28); color: var(--green); }
.tag-accent { border-color: rgba(201,186,155,.2); color: var(--accent); }

.metric-chip {
  background: var(--bg-panel); border: 0.5px solid var(--border);
  padding: 14px 18px;
}
.metric-chip-val {
  font-family: var(--display); font-size: 26px; font-weight: 800;
  color: var(--text); letter-spacing: -.02em; line-height: 1;
  margin-bottom: 4px;
}
.metric-chip-val .hi { color: var(--accent); }
.metric-chip-label {
  font-family: var(--mono); font-size: 9px; color: var(--text-3);
  letter-spacing: .12em; text-transform: uppercase;
}
.metric-chip-sub {
  font-family: var(--mono); font-size: 9px; color: var(--text-3);
  margin-top: 2px;
}

.btn-primary {
  font-family: var(--mono); font-size: 11px; letter-spacing: .12em;
  text-transform: uppercase; padding: 11px 22px;
  background: var(--accent); color: var(--bg);
  border: none; cursor: pointer; text-decoration: none;
  display: inline-block; transition: opacity .2s;
}
.btn-primary:hover { opacity: .82; }
.btn-ghost {
  font-family: var(--mono); font-size: 11px; letter-spacing: .12em;
  text-transform: uppercase; padding: 11px 22px;
  background: transparent; color: var(--text-2);
  border: 0.5px solid var(--border-md); cursor: pointer; text-decoration: none;
  display: inline-block; transition: border-color .2s, color .2s;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.arch-block {
  background: var(--bg-panel); border: 0.5px solid var(--border);
  border-left: 2px solid var(--accent);
  padding: 16px 18px; font-family: var(--mono); font-size: 10px;
}
.arch-row { display: flex; align-items: center; gap: 5px; flex-wrap: wrap; margin-bottom: 5px; }
.arch-row:last-child { margin-bottom: 0; }
.arch-node { padding: 3px 9px; border: 0.5px solid var(--border-md); color: var(--text-2); font-size: 9px; white-space: nowrap; }
.arch-node-hi { padding: 3px 9px; border: 0.5px solid rgba(201,186,155,.3); color: var(--accent); background: var(--accent-dim); font-size: 9px; white-space: nowrap; }
.arch-node-ok { padding: 3px 9px; border: 0.5px solid rgba(74,170,106,.25); color: var(--green); background: var(--green-dim); font-size: 9px; white-space: nowrap; }
.arch-arrow { color: var(--text-3); }
.arch-note { font-size: 9px; color: var(--text-3); letter-spacing: .04em; }

/* page entry wrapper */
.page-wrap { padding-top: 52px; }

/* fade-up animation */
.fu { opacity:0; transform:translateY(10px); animation: fadeUp .45s ease forwards; }
@keyframes fadeUp { to { opacity:1; transform:translateY(0); } }
.fu-1 { animation-delay:.06s; }
.fu-2 { animation-delay:.13s; }
.fu-3 { animation-delay:.20s; }
.fu-4 { animation-delay:.28s; }
.fu-5 { animation-delay:.36s; }
.fu-6 { animation-delay:.44s; }

/* theme transition */
*, *::before, *::after { transition: background-color .2s ease, border-color .2s ease, color .15s ease; }

/* theme toggle slider */
.theme-toggle {
  display: flex; align-items: center; cursor: pointer; user-select: none;
}
.theme-toggle input[type="checkbox"] {
  position: absolute; opacity: 0; width: 0; height: 0; pointer-events: none;
}
.toggle-track {
  width: 28px; height: 14px; border-radius: 7px;
  background: var(--bg-subtle); border: 0.5px solid var(--border-md);
  position: relative; flex-shrink: 0;
  transition: background .2s, border-color .2s;
}
.toggle-knob {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-2);
  position: absolute; top: 2px; left: 2px;
  transition: transform .2s ease, background .2s;
}
.theme-toggle input:checked + .toggle-track {
  background: var(--accent-dim); border-color: var(--accent);
}
.theme-toggle input:checked + .toggle-track .toggle-knob {
  transform: translateX(14px); background: var(--accent);
}