/* ==========================================================================
   IndusLab — Design System
   Built by a student, for students.
   Fonts: Fraunces (display) / Inter (body) / IBM Plex Mono (data & labels)
   ========================================================================== */

:root{
  /* ---- Light palette ---- */
  --paper:        #F7F9FC;
  --surface:      #FFFFFF;
  --surface-2:    #EEF3FB;
  --ink:          #0F1B2D;
  --ink-soft:     #3A4A63;
  --muted:        #5B6B82;
  --line:         #DCE4F0;

  --blue-900:     #0B2E6B;
  --blue-700:     #1E48B8;
  --blue-600:     #2A5CDB;
  --blue-500:     #4472E8;
  --blue-100:     #E7EEFC;

  --sky:          #6FA8FF;
  --amber:        #F5A623;
  --amber-ink:    #7A4E00;
  --green:        #1FAE7A;
  --green-ink:    #0B5F45;
  --coral:        #E8604C;

  --shadow-sm: 0 1px 2px rgba(15,27,45,.06), 0 1px 1px rgba(15,27,45,.04);
  --shadow-md: 0 8px 24px rgba(15,27,45,.08), 0 2px 6px rgba(15,27,45,.05);
  --shadow-lg: 0 24px 60px rgba(15,27,45,.14), 0 4px 14px rgba(15,27,45,.06);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;

  --container: 1180px;
  --nav-h: 76px;

  color-scheme: light;
}

html[data-theme="dark"]{
  --paper:      #0A1220;
  --surface:    #101A2E;
  --surface-2:  #16223A;
  --ink:        #EAF0FB;
  --ink-soft:   #C4D0E6;
  --muted:      #90A0BE;
  --line:       #223252;

  --blue-900:   #DCE8FF;
  --blue-700:   #9BBBFF;
  --blue-600:   #6FA8FF;
  --blue-500:   #4472E8;
  --blue-100:   #16223A;

  --sky:        #6FA8FF;
  --amber:      #FFC24D;
  --amber-ink:  #FFE3AC;
  --green:      #3BD8A2;
  --green-ink:  #9CF2D6;
  --coral:      #FF8A76;

  --shadow-sm: 0 1px 2px rgba(0,0,0,.35);
  --shadow-md: 0 8px 24px rgba(0,0,0,.45);
  --shadow-lg: 0 24px 60px rgba(0,0,0,.55);
  color-scheme: dark;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  transition:background .25s ease, color .25s ease;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; }
input,select,textarea{ font-family:inherit; font-size:1rem; }

h1,h2,h3,h4{ font-family:var(--font-display); font-weight:600; line-height:1.12; margin:0 0 .5em; color:var(--ink); letter-spacing:-.01em; }
h1{ font-size:clamp(2.3rem,4.6vw,3.7rem); }
h2{ font-size:clamp(1.7rem,3vw,2.5rem); }
h3{ font-size:clamp(1.2rem,2vw,1.5rem); }
p{ margin:0 0 1em; color:var(--ink-soft); }
.lede{ font-size:1.15rem; color:var(--ink-soft); }

.eyebrow{
  display:inline-flex; align-items:center; gap:.5em;
  font-family:var(--font-mono); font-size:.72rem; letter-spacing:.14em; text-transform:uppercase;
  color:var(--blue-600); font-weight:500;
}
.eyebrow::before{ content:""; width:16px; height:1px; background:var(--blue-600); display:inline-block; }

.mark{
  background-image: linear-gradient(transparent 62%, rgba(245,166,35,.45) 62%);
  background-repeat:no-repeat; padding:0 .05em;
}
html[data-theme="dark"] .mark{ background-image: linear-gradient(transparent 62%, rgba(255,194,77,.30) 62%); }

.container{ max-width:var(--container); margin:0 auto; padding:0 24px; }
.section{ padding:88px 0; }
.section--tight{ padding:56px 0; }
.section-head{ max-width:640px; margin:0 0 44px; }
.section-head.center{ margin-left:auto; margin-right:auto; text-align:center; }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:.5em;
  padding:13px 24px; border-radius:var(--radius-pill);
  font-weight:600; font-size:.95rem; cursor:pointer; border:1px solid transparent;
  transition:transform .15s ease, box-shadow .15s ease, background .2s ease, border-color .2s ease, color .2s ease;
  white-space:nowrap;
}
.btn:active{ transform:translateY(1px); }
.btn-primary{ background:var(--blue-600); color:#fff; box-shadow:var(--shadow-sm); }
.btn-primary:hover{ background:var(--blue-700); box-shadow:var(--shadow-md); }
.btn-ghost{ background:transparent; color:var(--ink); border-color:var(--line); }
.btn-ghost:hover{ border-color:var(--blue-600); color:var(--blue-600); }
.btn-amber{ background:var(--amber); color:#3A2600; box-shadow:var(--shadow-sm); }
.btn-amber:hover{ box-shadow:var(--shadow-md); filter:brightness(1.04); }
.btn-sm{ padding:9px 16px; font-size:.85rem; }
.btn-block{ width:100%; }
.btn[disabled]{ opacity:.55; cursor:not-allowed; }

/* ---------- Nav ---------- */
.nav{
  position:sticky; top:0; z-index:100; height:var(--nav-h);
  display:flex; align-items:center;
  background:color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter:blur(10px); border-bottom:1px solid var(--line);
}
.nav .container{ display:flex; align-items:center; justify-content:space-between; gap:20px; }
.brand{ display:flex; align-items:center; gap:10px; font-family:var(--font-display); font-weight:600; font-size:1.25rem; color:var(--ink); }
.brand .logo{ width:34px; height:34px; border-radius:9px; background:linear-gradient(145deg,var(--blue-600),var(--sky)); display:flex; align-items:center; justify-content:center; color:#fff; font-family:var(--font-mono); font-weight:600; font-size:.85rem; box-shadow:var(--shadow-sm); }
.nav-links{ display:flex; align-items:center; gap:30px; }
.nav-links a{ font-size:.94rem; font-weight:500; color:var(--ink-soft); position:relative; padding:6px 0; }
.nav-links a:hover, .nav-links a.active{ color:var(--ink); }
.nav-links a.active::after{ content:""; position:absolute; left:0; right:0; bottom:-2px; height:2px; background:var(--amber); border-radius:2px; }
.nav-actions{ display:flex; align-items:center; gap:12px; }
.icon-btn{
  width:38px; height:38px; border-radius:var(--radius-pill); border:1px solid var(--line);
  display:flex; align-items:center; justify-content:center; background:var(--surface); cursor:pointer; color:var(--ink-soft);
  transition:border-color .2s, color .2s;
}
.icon-btn:hover{ border-color:var(--blue-600); color:var(--blue-600); }
.nav-burger{ display:none; }
.avatar{
  width:38px; height:38px; border-radius:50%; background:var(--blue-100); color:var(--blue-700);
  display:flex; align-items:center; justify-content:center; font-family:var(--font-mono); font-weight:600; font-size:.85rem; border:1px solid var(--line);
}

/* mobile nav */
.mobile-panel{
  position:fixed; inset:var(--nav-h) 0 0 0; background:var(--paper); z-index:99;
  padding:24px; display:none; flex-direction:column; gap:6px; overflow-y:auto;
}
.mobile-panel.open{ display:flex; }
.mobile-panel a{ padding:14px 6px; font-size:1.05rem; border-bottom:1px solid var(--line); color:var(--ink); }
.mobile-panel .btn{ margin-top:14px; }

/* ---------- Badges / chips ---------- */
.badge{
  display:inline-flex; align-items:center; gap:6px; font-family:var(--font-mono);
  font-size:.72rem; letter-spacing:.04em; padding:5px 11px; border-radius:var(--radius-pill);
  border:1px solid var(--line); color:var(--muted); background:var(--surface);
}
.badge-dot{ width:6px; height:6px; border-radius:50%; }
.badge-live{ color:var(--green-ink); border-color:rgba(31,174,122,.35); background:rgba(31,174,122,.08); }
.badge-live .badge-dot{ background:var(--green); box-shadow:0 0 0 3px rgba(31,174,122,.18); }
.badge-soon{ color:var(--amber-ink); border-color:rgba(245,166,35,.4); background:rgba(245,166,35,.1); }
.badge-soon .badge-dot{ background:var(--amber); }
.tag{
  font-family:var(--font-mono); font-size:.7rem; padding:4px 10px; border-radius:var(--radius-pill);
  background:var(--surface-2); color:var(--ink-soft); border:1px solid var(--line);
}
.student-badge{
  display:inline-flex; align-items:center; gap:8px; padding:8px 16px 8px 8px; border-radius:var(--radius-pill);
  background:var(--surface); border:1px solid var(--line); box-shadow:var(--shadow-sm); font-size:.85rem; color:var(--ink-soft);
}
.student-badge .dot-pulse{ width:9px; height:9px; border-radius:50%; background:var(--green); position:relative; }
.student-badge .dot-pulse::after{ content:""; position:absolute; inset:-4px; border-radius:50%; border:1px solid var(--green); animation:pulse 2s infinite; }
@keyframes pulse{ 0%{ transform:scale(.7); opacity:.9; } 100%{ transform:scale(1.8); opacity:0; } }

/* ---------- Cards ---------- */
.card{ background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-lg); box-shadow:var(--shadow-sm); }
.card-pad{ padding:28px; }

/* ---------- Grid helpers ---------- */
.grid{ display:grid; gap:24px; }
.grid-3{ grid-template-columns:repeat(3,1fr); }
.grid-2{ grid-template-columns:repeat(2,1fr); }
.grid-4{ grid-template-columns:repeat(4,1fr); }

/* ---------- Hero ---------- */
.hero{ position:relative; padding:76px 0 60px; overflow:hidden; }
.hero-grid{ display:grid; grid-template-columns:1.05fr .95fr; gap:56px; align-items:center; }
.hero-copy h1{ margin-bottom:.4em; }
.hero-stats{ display:flex; gap:28px; margin-top:36px; flex-wrap:wrap; }
.hero-stat b{ display:block; font-family:var(--font-display); font-size:1.6rem; color:var(--ink); }
.hero-stat span{ font-size:.8rem; color:var(--muted); font-family:var(--font-mono); }
.hero-cta{ display:flex; gap:14px; margin-top:32px; flex-wrap:wrap; }
.paper-grid{
  position:absolute; inset:0; z-index:-1;
  background-image:
    linear-gradient(color-mix(in srgb, var(--blue-600) 6%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--blue-600) 6%, transparent) 1px, transparent 1px);
  background-size:34px 34px;
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 90%);
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 90%);
}

/* Notebook panel visual used in hero / story */
.notebook{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-lg);
  box-shadow:var(--shadow-lg); padding:26px; position:relative;
}
.notebook::before{
  content:""; position:absolute; left:44px; top:0; bottom:0; width:1px; background:rgba(232,96,76,.25);
}
.notebook-line{ font-family:var(--font-mono); font-size:.82rem; color:var(--ink-soft); padding:9px 0 9px 56px; border-bottom:1px dashed var(--line); position:relative; }
.notebook-line:last-child{ border-bottom:none; }
.notebook-line .n{ position:absolute; left:0; width:34px; text-align:right; color:var(--muted); }
.notebook-head{ display:flex; align-items:center; justify-content:space-between; margin-bottom:14px; }
.notebook-head .tabs{ display:flex; gap:6px; }
.notebook-head .tabs span{ width:10px; height:10px; border-radius:50%; background:var(--line); }

/* ---------- Feature list ---------- */
.feature{ display:flex; gap:16px; }
.feature-icon{
  flex:0 0 auto; width:46px; height:46px; border-radius:14px; background:var(--blue-100);
  display:flex; align-items:center; justify-content:center; color:var(--blue-700);
}
html[data-theme="dark"] .feature-icon{ color:var(--sky); }

/* ---------- Tool cards ---------- */
.tool-card{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-lg);
  padding:26px; display:flex; flex-direction:column; gap:14px; box-shadow:var(--shadow-sm);
  transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.tool-card:hover{ transform:translateY(-4px); box-shadow:var(--shadow-md); border-color:color-mix(in srgb, var(--blue-600) 30%, var(--line)); }
.tool-card-top{ display:flex; align-items:flex-start; justify-content:space-between; gap:10px; }
.tool-icon{ width:48px; height:48px; border-radius:13px; display:flex; align-items:center; justify-content:center; font-size:1.3rem; }
.tool-card h3{ margin:0; }
.tool-meta{ display:flex; gap:8px; flex-wrap:wrap; margin-top:auto; }
.tool-foot{ display:flex; align-items:center; justify-content:space-between; margin-top:6px; gap:10px; }
.tool-lineage{ font-size:.78rem; color:var(--muted); border-top:1px dashed var(--line); padding-top:12px; margin-top:2px; }
.tool-feature-list{ margin:0; padding:0; display:flex; flex-direction:column; gap:6px; }
.tool-feature-list li{ font-size:.86rem; color:var(--ink-soft); display:flex; gap:8px; align-items:flex-start; }
.tool-feature-list li::before{ content:"—"; color:var(--blue-600); flex:0 0 auto; }

.section-band{ background:var(--surface-2); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }

/* ---------- Steps ---------- */
.step{ display:flex; gap:20px; }
.step-num{ font-family:var(--font-mono); font-size:.85rem; color:var(--blue-600); border:1px solid var(--line); background:var(--surface); width:38px; height:38px; border-radius:50%; display:flex; align-items:center; justify-content:center; flex:0 0 auto; }

/* ---------- Testimonials ---------- */
.tmark{ font-family:var(--font-display); font-style:italic; font-size:1.05rem; color:var(--ink); }
.tperson{ display:flex; align-items:center; gap:12px; margin-top:16px; }
.tperson .avatar{ width:40px; height:40px; }

/* ---------- Forms ---------- */
.field{ margin-bottom:18px; }
.field label{ display:block; font-size:.85rem; font-weight:600; margin-bottom:7px; color:var(--ink); }
.field input, .field select, .field textarea{
  width:100%; padding:12px 14px; border-radius:var(--radius-sm); border:1px solid var(--line);
  background:var(--surface); color:var(--ink); outline:none; transition:border-color .15s;
}
.field input:focus, .field select:focus, .field textarea:focus{ border-color:var(--blue-600); }
.field-hint{ font-size:.78rem; color:var(--muted); margin-top:6px; }
.divider{ display:flex; align-items:center; gap:14px; color:var(--muted); font-size:.8rem; margin:22px 0; }
.divider::before,.divider::after{ content:""; flex:1; height:1px; background:var(--line); }
.auth-card{ max-width:440px; margin:0 auto; }
.chip-select{ display:flex; flex-wrap:wrap; gap:10px; }
.chip-option{
  padding:11px 16px; border-radius:var(--radius-pill); border:1px solid var(--line); background:var(--surface);
  cursor:pointer; font-size:.88rem; color:var(--ink-soft); transition:.15s;
}
.chip-option:hover{ border-color:var(--blue-600); }
.chip-option.selected{ background:var(--blue-600); color:#fff; border-color:var(--blue-600); }

/* ---------- Footer ---------- */
footer{ background:var(--surface); border-top:1px solid var(--line); padding:64px 0 28px; margin-top:40px; }
.footer-grid{ display:grid; grid-template-columns:1.6fr repeat(4,1fr); gap:32px; margin-bottom:48px; }
.footer-col h4{ font-family:var(--font-mono); font-size:.75rem; letter-spacing:.08em; text-transform:uppercase; color:var(--muted); margin-bottom:16px; font-weight:600; }
.footer-col a{ display:block; font-size:.9rem; color:var(--ink-soft); margin-bottom:11px; }
.footer-col a:hover{ color:var(--blue-600); }
.footer-bottom{ display:flex; align-items:center; justify-content:space-between; border-top:1px solid var(--line); padding-top:24px; flex-wrap:wrap; gap:14px; }
.footer-bottom small{ color:var(--muted); font-size:.8rem; }
.social-row{ display:flex; gap:10px; }

/* ---------- Utilities ---------- */
.flex{ display:flex; }
.items-center{ align-items:center; }
.justify-between{ justify-content:space-between; }
.gap-8{ gap:8px; } .gap-12{ gap:12px; } .gap-16{ gap:16px; } .gap-24{ gap:24px; }
.mt-0{ margin-top:0 } .mb-0{ margin-bottom:0 }
.text-center{ text-align:center; }
.muted{ color:var(--muted); }
.small{ font-size:.85rem; }
.mono{ font-family:var(--font-mono); }
.w-full{ width:100%; }
.hidden{ display:none !important; }
.pill-input{
  display:flex; align-items:center; gap:10px; background:var(--surface); border:1px solid var(--line);
  border-radius:var(--radius-pill); padding:10px 18px;
}
.pill-input input{ border:none; outline:none; background:transparent; flex:1; color:var(--ink); }

/* search bar (nav + tools page) */
.search-bar{ position:relative; }
.search-bar input{
  width:100%; padding:14px 18px 14px 46px; border-radius:var(--radius-pill); border:1px solid var(--line);
  background:var(--surface); color:var(--ink); outline:none;
}
.search-bar input:focus{ border-color:var(--blue-600); }
.search-bar svg{ position:absolute; left:17px; top:50%; transform:translateY(-50%); color:var(--muted); }

/* filter chips */
.filter-row{ display:flex; gap:10px; flex-wrap:wrap; }

/* CTA banner */
.cta-band{
  border-radius:var(--radius-lg); background:linear-gradient(135deg,var(--blue-700),var(--blue-600) 55%, var(--sky));
  color:#fff; padding:64px; text-align:center; position:relative; overflow:hidden;
}
.cta-band h2{ color:#fff; }
.cta-band p{ color:rgba(255,255,255,.85); }
.cta-band .btn-primary{ background:#fff; color:var(--blue-700); }
.cta-band .btn-primary:hover{ background:#f2f2f2; }
.cta-band .btn-ghost{ border-color:rgba(255,255,255,.4); color:#fff; }
.cta-band .btn-ghost:hover{ border-color:#fff; }

/* Dashboard */
.dash-grid{ display:grid; grid-template-columns:280px 1fr; gap:32px; align-items:start; }
.dash-side{ position:sticky; top:calc(var(--nav-h) + 24px); display:flex; flex-direction:column; gap:16px; }
.progress-ring-wrap{ display:flex; align-items:center; gap:14px; }
.stat-row{ display:flex; justify-content:space-between; padding:10px 0; border-bottom:1px solid var(--line); font-size:.88rem; }
.stat-row:last-child{ border-bottom:none; }

/* Blog */
.post-card img,.post-card .thumb{ border-radius:var(--radius-md) var(--radius-md) 0 0; }
.thumb{ height:170px; background:linear-gradient(135deg,var(--blue-100),var(--surface-2)); display:flex; align-items:center; justify-content:center; color:var(--blue-600); font-family:var(--font-mono); font-size:2rem; }

/* Table (legal pages TOC) */
.toc{ position:sticky; top:calc(var(--nav-h) + 24px); }
.toc a{ display:block; padding:8px 0; font-size:.87rem; color:var(--muted); border-left:2px solid var(--line); padding-left:14px; }
.toc a:hover{ color:var(--blue-600); border-color:var(--blue-600); }
.legal-grid{ display:grid; grid-template-columns:220px 1fr; gap:48px; }
.legal-body h2{ font-size:1.35rem; margin-top:2em; }
.legal-body h3{ font-size:1.05rem; }
.legal-body p, .legal-body li{ color:var(--ink-soft); }
.legal-body li{ margin-bottom:.4em; }

/* Toast */
#toast{
  position:fixed; bottom:24px; left:50%; transform:translateX(-50%) translateY(20px); opacity:0;
  background:var(--ink); color:var(--paper); padding:13px 22px; border-radius:var(--radius-pill);
  font-size:.88rem; z-index:999; pointer-events:none; transition:.25s ease; box-shadow:var(--shadow-lg);
}
#toast.show{ opacity:1; transform:translateX(-50%) translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 980px){
  .hero-grid{ grid-template-columns:1fr; }
  .grid-3{ grid-template-columns:repeat(2,1fr); }
  .grid-4{ grid-template-columns:repeat(2,1fr); }
  .footer-grid{ grid-template-columns:repeat(3,1fr); }
  .dash-grid{ grid-template-columns:1fr; }
  .dash-side{ position:static; }
  .legal-grid{ grid-template-columns:1fr; }
  .toc{ display:none; }
}
@media (max-width: 720px){
  .nav-links{ display:none; }
  .nav-burger{ display:flex; }
  .grid-2,.grid-3,.grid-4{ grid-template-columns:1fr; }
  .footer-grid{ grid-template-columns:repeat(2,1fr); }
  .section{ padding:56px 0; }
  .cta-band{ padding:40px 24px; }
  .hero{ padding:44px 0 40px; }
}
@media (prefers-reduced-motion: reduce){
  *{ animation-duration:.001ms !important; transition-duration:.001ms !important; }
}