/* ===================================================================
   RTI Institute — Learning Portal
   Design System (Clean & Professional)
   =================================================================== */

:root {
  /* Brand colors — Rama Technical Institute (logo: red gear + green diya) */
  --brand:        #9e0c10;
  --brand-dark:   #780a0d;
  --brand-light:  #fdecec;
  --accent:       #00a751;
  --accent-dark:  #007d3d;
  --danger:       #dc2626;
  --warning:      #f59e0b;

  /* Neutrals */
  --ink:          #0f172a;
  --body:         #334155;
  --muted:        #64748b;
  --line:         #e2e8f0;
  --bg:           #f7f9fc;
  --card:         #ffffff;

  /* Effects */
  --radius:       14px;
  --radius-sm:    9px;
  --shadow:       0 1px 2px rgba(15,23,42,.06), 0 8px 24px rgba(15,23,42,.06);
  --shadow-lg:    0 12px 40px rgba(158,12,16,.20);
  --ring:         0 0 0 3px var(--brand-light);

  --maxw:         1180px;
  --header-h:     66px;
  --font:         "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --header-bg:    rgba(255,255,255,.9);
}

/* ===================================================================
   THEMES — user header se choose kar sakta hai (localStorage me save)
   Sab themes contrast-safe hain (text hamesha dikhega)
   =================================================================== */
[data-theme="sepia"] {
  --bg: #f3ead9; --card: #fffaf0; --ink: #3a2f23; --body: #5c4d3b; --muted: #8a7a64;
  --line: #e7dbc4; --header-bg: rgba(255,250,240,.9);
}
[data-theme="ocean"] {
  --bg: #eaf2fb; --card: #ffffff; --ink: #102536; --body: #335068; --muted: #6c8298;
  --line: #d4e2f0; --header-bg: rgba(255,255,255,.9);
}
[data-theme="dark"] {
  --bg: #0e1217; --card: #191f27; --ink: #f3f6fa; --body: #c3cdd9; --muted: #8b98a8; --line: #2a323d;
  --brand: #ef5a5f; --brand-dark: #d8454b; --brand-light: #2a1a1c;
  --header-bg: rgba(16,20,26,.9);
  --shadow: 0 1px 2px rgba(0,0,0,.45), 0 8px 24px rgba(0,0,0,.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.5);
}
/* Dark-mode contrast fixes */
[data-theme="dark"] .tag { color: var(--brand); }
[data-theme="dark"] .callout { background: #2a1a1c; color: var(--body); }
[data-theme="dark"] .note code { background: #2a323d; color: #ff9ec4; }
[data-theme="dark"] .role-switch button.active { background: var(--card); }
[data-theme="dark"] .code-tag,
[data-theme="dark"] .fee-amt { color: color-mix(in srgb, var(--cc, #ef5a5f) 62%, #ffffff) !important; }
[data-theme="dark"] .btn-ghost { background: var(--card); color: var(--ink); }

/* Copy-protection: content select na ho, par form fields me typing chale */
body { -webkit-user-select: none; -moz-user-select: none; user-select: none; }
input, textarea, select { -webkit-user-select: text; user-select: text; }

/* ---------- Reset ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--body);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; transition: color .15s; }
a:hover { color: var(--brand-dark); }
ul { list-style: none; }
h1,h2,h3,h4 { color: var(--ink); line-height: 1.25; font-weight: 700; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }
.section-sm { padding: 44px 0; }
.text-center { text-align: center; }
.muted { color: var(--muted); }

.eyebrow {
  display: inline-block; font-size: .8rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--brand);
  background: var(--brand-light); padding: 5px 12px; border-radius: 999px; margin-bottom: 14px;
}
.section-title { font-size: clamp(1.6rem, 3vw, 2.3rem); margin-bottom: 10px; }
.section-sub { color: var(--muted); max-width: 620px; margin: 0 auto 8px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: .95rem; cursor: pointer;
  padding: 11px 22px; border-radius: var(--radius-sm); border: 1px solid transparent;
  transition: transform .12s, box-shadow .15s, background .15s; white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); color: #fff; box-shadow: var(--shadow-lg); }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-dark); color:#fff; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }
.btn-block { width: 100%; justify-content: center; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--header-bg); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav {
  height: var(--header-h); display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ink); font-size: 1.15rem; }
.brand .logo-mark {
  width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--brand), var(--accent)); color: #fff; font-weight: 800;
}
.brand .logo-img { width: 46px; height: 46px; object-fit: contain; }
.brand small { display:block; font-size:.62rem; font-weight:600; letter-spacing:.12em; color:var(--muted); text-transform:uppercase; }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  color: var(--body); font-weight: 500; font-size: .95rem; padding: 8px 14px; border-radius: 8px;
}
.nav-links a:hover, .nav-links a.active { color: var(--brand); background: var(--brand-light); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; font-size: 1.6rem; color: var(--ink); }

/* Theme switcher */
.theme-wrap { position: relative; }
.theme-btn { background: var(--card); border: 1px solid var(--line); border-radius: 9px; padding: 7px 11px; cursor: pointer; color: var(--ink); font-size: 1.05rem; line-height: 1; }
.theme-btn:hover { border-color: var(--brand); }
.theme-menu { position: absolute; right: 0; top: calc(100% + 8px); background: var(--card); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-lg); padding: 6px; min-width: 180px; z-index: 60; }
.theme-menu.hide { display: none; }
.theme-menu .tm-head { font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); padding: 6px 12px 4px; font-weight: 700; }
.theme-menu button { display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; background: none; border: none; padding: 9px 12px; border-radius: 8px; cursor: pointer; color: var(--body); font-size: .9rem; font-weight: 500; }
.theme-menu button:hover { background: var(--bg); }
.theme-menu button.active { color: var(--brand); font-weight: 700; }
.theme-swatch { width: 18px; height: 18px; border-radius: 50%; border: 1px solid var(--line); flex: none; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 80px 0 70px; }
.hero::before {
  content:""; position:absolute; inset:0; z-index:-1;
  background:
    radial-gradient(900px 400px at 90% -10%, rgba(0,167,81,.10), transparent),
    radial-gradient(800px 500px at -10% 10%, rgba(158,12,16,.12), transparent);
}
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 50px; align-items: center; }
.hero h1 { font-size: clamp(2rem, 4.5vw, 3.2rem); letter-spacing: -.02em; }
.hero h1 .grad {
  background: linear-gradient(135deg, var(--brand), var(--accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p.lead { font-size: 1.12rem; color: var(--body); margin: 18px 0 26px; max-width: 540px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-stats { display: flex; gap: 30px; margin-top: 36px; }
.hero-stats .num { font-size: 1.7rem; font-weight: 800; color: var(--ink); }
.hero-stats .lbl { font-size: .82rem; color: var(--muted); }
.hero-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 22px;
  box-shadow: var(--shadow);
}
.hero-card h4 { margin-bottom: 14px; font-size: 1rem; }
.mini-course { display:flex; align-items:center; gap:12px; padding:12px; border-radius:12px; transition:background .15s; }
.mini-course:hover { background: var(--bg); }
.mini-course .ico { width:42px; height:42px; border-radius:10px; display:grid; place-items:center; font-size:1.2rem; background:var(--brand-light); }
.mini-course .t { font-weight:600; color:var(--ink); font-size:.95rem; }
.mini-course .s { font-size:.78rem; color:var(--muted); }

/* ---------- Grid / Cards ---------- */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow); transition: transform .18s, box-shadow .18s, border-color .18s;
}
.card:hover { transform: translateY(-4px); border-color: #cfe0ff; box-shadow: var(--shadow-lg); }

/* Themed card background — har card par uske subject ka vibe */
.course-card { position: relative; overflow: hidden; isolation: isolate; }
.course-card::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background:
    radial-gradient(160px 160px at 115% -12%, color-mix(in srgb, var(--cc, #9e0c10) 26%, transparent), transparent 70%),
    radial-gradient(160px 160px at -15% 115%, color-mix(in srgb, var(--cc, #9e0c10) 16%, transparent), transparent 72%),
    linear-gradient(160deg, var(--card) 52%, color-mix(in srgb, var(--cc, #9e0c10) 9%, var(--card)));
}
.course-card::after {   /* halki dotted texture */
  content: ""; position: absolute; inset: 0; z-index: -2; opacity: .5;
  background-image: radial-gradient(color-mix(in srgb, var(--cc,#9e0c10) 18%, transparent) 1px, transparent 1.4px);
  background-size: 16px 16px;
  -webkit-mask-image: linear-gradient(135deg, rgba(0,0,0,.5), transparent 60%);
          mask-image: linear-gradient(135deg, rgba(0,0,0,.5), transparent 60%);
}
.card-watermark {
  position: absolute; right: -22px; bottom: -40px; z-index: -1;
  font-size: 12.5rem; line-height: 1; opacity: .14; transform: rotate(-10deg);
  pointer-events: none; user-select: none; filter: saturate(1.1);
}
.course-card:hover .card-watermark { opacity: .22; transform: rotate(-6deg) scale(1.05); transition: .25s; }
.course-card:hover::before { filter: saturate(1.12); }

.course-card .c-ico {
  width: 56px; height: 56px; border-radius: 15px; display: grid; place-items: center; font-size: 1.75rem;
  margin-bottom: 14px; box-shadow: 0 6px 16px color-mix(in srgb, var(--cc,#9e0c10) 22%, transparent);
  background: linear-gradient(145deg, color-mix(in srgb, var(--cc,#9e0c10) 18%, var(--card)), var(--card)) !important;
  color: var(--cc);
}
/* Card accent text (theme-aware via --cc) */
.course-card .code-tag { background: color-mix(in srgb, var(--cc) 13%, transparent); color: var(--cc); }
.course-card .fee-amt { color: var(--cc); }
.course-card h3 { font-size: 1.1rem; margin-bottom: 6px; }
.course-card p { font-size: .9rem; color: var(--muted); margin-bottom: 16px; min-height: 40px; }
.course-meta { display: flex; gap: 14px; font-size: .8rem; color: var(--muted); margin-bottom: 16px; }
.course-meta span { display: inline-flex; align-items: center; gap: 5px; }
.tag { font-size:.72rem; font-weight:600; padding:3px 9px; border-radius:999px; background:var(--brand-light); color:var(--brand-dark); }

.feature .f-ico { width:48px; height:48px; border-radius:12px; display:grid; place-items:center; font-size:1.4rem; background:var(--brand-light); margin-bottom:14px; }
.feature h3 { font-size:1.05rem; margin-bottom:6px; }
.feature p { font-size:.9rem; color: var(--muted); }

/* ---------- Course detail page ---------- */
.page-head { background: linear-gradient(135deg, #780a0d, #b3121a); color:#fff; padding: 46px 0; }
.page-head h1 { color:#fff; font-size: clamp(1.6rem,3.5vw,2.4rem); }
.page-head p { color: rgba(255,255,255,.85); max-width:680px; margin-top:8px; }
.breadcrumb { font-size:.85rem; color: rgba(255,255,255,.8); margin-bottom:12px; }
.breadcrumb a { color:#fff; opacity:.9; }

.layout-2 { display:grid; grid-template-columns: 280px 1fr; gap: 32px; align-items:start; }
.sidebar { position: sticky; top: calc(var(--header-h) + 18px); }
.toc { background:var(--card); border:1px solid var(--line); border-radius:var(--radius); padding:16px; box-shadow:var(--shadow); }
.toc h4 { font-size:.78rem; text-transform:uppercase; letter-spacing:.08em; color:var(--muted); margin-bottom:10px; }
.toc a { display:block; padding:9px 12px; border-radius:8px; color:var(--body); font-size:.92rem; font-weight:500; }
.toc a:hover, .toc a.active { background:var(--brand-light); color:var(--brand); }

.note { background:var(--card); border:1px solid var(--line); border-radius:var(--radius); padding: 28px 30px; box-shadow:var(--shadow); margin-bottom: 22px; }
.note h2 { font-size:1.5rem; margin-bottom: 6px; scroll-margin-top: 90px; }
.note h3 { font-size:1.15rem; margin: 20px 0 8px; }
.note p { margin-bottom: 12px; }
.note ul, .note ol { margin: 0 0 14px 22px; }
.note li { margin-bottom: 6px; }
.note ul { list-style: disc; }
.note ol { list-style: decimal; }
.note code { background:#f1f5f9; padding:2px 6px; border-radius:6px; font-size:.88em; color:#be185d; }
.note pre { background:#0f172a; color:#e2e8f0; padding:16px; border-radius:10px; overflow:auto; margin-bottom:14px; font-size:.88rem; }
.note pre code { background:none; color:inherit; padding:0; }
.callout { border-left:4px solid var(--brand); background:var(--brand-light); padding:12px 16px; border-radius:8px; margin:14px 0; font-size:.92rem; }

/* Progress bar (subject page) */
.prog-bar { height:10px; background:var(--line); border-radius:999px; overflow:hidden; margin-top:10px; }
.prog-fill { height:100%; background:linear-gradient(90deg, var(--accent), var(--brand)); border-radius:999px; transition:width .35s ease; }
#progBox { border:1px solid color-mix(in srgb, var(--accent) 35%, var(--line)); }
.mark-btn { min-width:140px; }

/* ---------- Auth / Login ---------- */
.auth-wrap { min-height: calc(100vh - var(--header-h)); display:grid; place-items:center; padding: 40px 20px; }
.auth-card { width:100%; max-width: 430px; background:var(--card); border:1px solid var(--line); border-radius: 18px; padding: 34px; box-shadow: var(--shadow-lg); }
.auth-card h2 { font-size:1.5rem; text-align:center; }
.auth-card .sub { text-align:center; color:var(--muted); margin-bottom:22px; font-size:.92rem; }
.role-switch { display:grid; grid-template-columns:1fr 1fr; gap:8px; background:var(--bg); padding:5px; border-radius:12px; margin-bottom:22px; }
.role-switch button { padding:10px; border:none; border-radius:9px; background:transparent; cursor:pointer; font-weight:600; color:var(--muted); }
.role-switch button.active { background:#fff; color:var(--brand); box-shadow:var(--shadow); }
.field { margin-bottom:16px; }
.field label { display:block; font-size:.85rem; font-weight:600; color:var(--ink); margin-bottom:6px; }
.field input, .field select {
  width:100%; padding:11px 13px; border:1px solid var(--line); border-radius:10px; font-size:.95rem; font-family:inherit; color:var(--ink); background:var(--card);
}
.field input:focus, .field select:focus { outline:none; border-color:var(--brand); box-shadow:var(--ring); }
.auth-hint { font-size:.82rem; color:var(--muted); text-align:center; margin-top:16px; }
.alert { padding:11px 14px; border-radius:10px; font-size:.88rem; margin-bottom:16px; display:none; }
.alert.err { background:#fef2f2; color:var(--danger); border:1px solid #fecaca; }
.alert.ok  { background:#f0fdf4; color:var(--accent-dark); border:1px solid #bbf7d0; }

/* ---------- Dashboard ---------- */
.dash { padding: 32px 0; }
.dash-head { display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:14px; margin-bottom:26px; }
.dash-head h1 { font-size:1.6rem; }
.stat-card { display:flex; align-items:center; gap:14px; }
.stat-card .s-ico { width:46px; height:46px; border-radius:12px; display:grid; place-items:center; font-size:1.3rem; background:var(--brand-light); }
.stat-card .s-num { font-size:1.5rem; font-weight:800; color:var(--ink); line-height:1; }
.stat-card .s-lbl { font-size:.82rem; color:var(--muted); }
.badge { font-size:.72rem; font-weight:700; padding:3px 10px; border-radius:999px; }
.badge.green { background:#dcfce7; color:var(--accent-dark); }
.badge.blue { background:var(--brand-light); color:var(--brand-dark); }
.badge.amber{ background:#fef3c7; color:#b45309; }

table.tbl { width:100%; border-collapse:collapse; font-size:.92rem; }
table.tbl th, table.tbl td { text-align:left; padding:12px 14px; border-bottom:1px solid var(--line); }
table.tbl th { font-size:.78rem; text-transform:uppercase; letter-spacing:.05em; color:var(--muted); }
table.tbl tr:hover td { background:var(--bg); }

/* ---------- Enquiry Modal ---------- */
.enq-overlay { position: fixed; inset: 0; background: rgba(15,23,42,.55); backdrop-filter: blur(3px);
  display: grid; place-items: center; z-index: 200; padding: 20px; animation: enqFade .15s ease; }
.enq-overlay.hide { display: none; }
@keyframes enqFade { from { opacity: 0; } to { opacity: 1; } }
.enq-card { background: var(--card); border-radius: 18px; max-width: 470px; width: 100%; padding: 28px;
  box-shadow: var(--shadow-lg); max-height: 92vh; overflow: auto; position: relative; }
.enq-card .enq-top { display: flex; align-items: center; gap: 12px; margin-bottom: 6px; }
.enq-card .enq-top img { width: 42px; height: 42px; object-fit: contain; }
.enq-card h3 { font-size: 1.25rem; }
.enq-card .enq-sub { color: var(--muted); font-size: .9rem; margin-bottom: 18px; }
.enq-close { position: absolute; top: 14px; right: 16px; background: none; border: none; font-size: 1.4rem;
  cursor: pointer; color: var(--muted); line-height: 1; }
.enq-close:hover { color: var(--ink); }
.enq-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.enq-req { color: var(--danger); }
@media (max-width: 480px) { .enq-row { grid-template-columns: 1fr; } }

/* ---------- Footer ---------- */
.site-footer { background:#0b1220; color:#94a3b8; padding: 54px 0 24px; margin-top: 40px; }
.footer-grid { display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap:30px; }
.site-footer h4 { color:#fff; font-size:.95rem; margin-bottom:14px; }
.site-footer a { color:#94a3b8; font-size:.9rem; display:block; padding:4px 0; }
.site-footer a:hover { color:#fff; }
.footer-brand { color:#fff; font-weight:800; font-size:1.2rem; margin-bottom:10px; }
.footer-bottom { border-top:1px solid #1e293b; margin-top:34px; padding-top:18px; font-size:.85rem; text-align:center; }

/* ---------- Utilities ---------- */
.hide { display:none !important; }
.mt-0{margin-top:0}.mb-0{margin-bottom:0}
.flex { display:flex; } .between{justify-content:space-between} .center-y{align-items:center} .gap{gap:12px} .wrap{flex-wrap:wrap}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-card { order:-1; }
  .grid-4 { grid-template-columns: repeat(2,1fr); }
  .grid-3 { grid-template-columns: repeat(2,1fr); }
  .layout-2 { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-links { display:none; position:absolute; top:var(--header-h); left:0; right:0; flex-direction:column; align-items:stretch; background:#fff; border-bottom:1px solid var(--line); padding:10px; gap:2px; }
  .nav-links.open { display:flex; }
  .nav-links a { padding:12px 14px; }
  .nav-toggle { display:block; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .hero-stats { gap:18px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .section { padding:52px 0; }
}