/* ========================================
   TCS ILP Ultimate Study Guide — Premium
   ======================================== */

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

/* ── VARIABLES ── */
:root {
  --bg: #09090b;
  --bg-card: #0f0f11;
  --bg-card-hover: #161618;
  --bg-surface: #121214;
  --bg-elevated: #1a1a1e;
  --text: #d4d4d8;
  --text-muted: #71717a;
  --text-dim: #52525b;
  --accent: #a1a1aa;
  --accent-hover: #d4d4d8;
  --accent-glow: rgba(161, 161, 170, .08);
  --border: #1e1e22;
  --border-hover: #2e2e34;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  --purple: #8b5cf6;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,.5);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.6);
  --shadow-glow: 0 0 40px rgba(255,255,255,.03);
  --sidebar-w: 270px;
  --text-strong: #ffffff;
  --transition: .2s cubic-bezier(.4,0,.2,1);
}

/* ── LIGHT THEME ── */
[data-theme="light"] {
  --text-strong: #18181b;
  --bg: #f8f8fa;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f0f2;
  --bg-surface: #f2f2f5;
  --bg-elevated: #e8e8ec;
  --text: #27272a;
  --text-muted: #52525b;
  --text-dim: #71717a;
  --accent: #52525b;
  --accent-hover: #27272a;
  --accent-glow: rgba(82, 82, 91, .06);
  --border: #e4e4e7;
  --border-hover: #d4d4d8;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --info: #2563eb;
  --purple: #7c3aed;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.1);
  --shadow-glow: 0 0 40px rgba(0,0,0,.03);
}
/* strong and text-strong handled by --text-strong variable */
[data-theme="light"] code{background:#e8e8ec;color:#7c3aed;border-color:#d4d4d8}
[data-theme="light"] pre{background:#f2f2f5;color:#27272a;border-color:#e4e4e7}
[data-theme="light"] pre::before{background:#d4d4d8}
[data-theme="light"] pre .kw{color:#7c3aed}
[data-theme="light"] pre .str{color:#16a34a}
[data-theme="light"] pre .num{color:#d97706}
[data-theme="light"] pre .cmt{color:#a1a1aa;font-style:italic}
[data-theme="light"] pre .fn{color:#2563eb}
[data-theme="light"] pre .type{color:#b45309}
[data-theme="light"] th{background:#e8e8ec;color:#18181b;border-bottom-color:#d4d4d8}
[data-theme="light"] tr:hover{background:rgba(0,0,0,.02)}
[data-theme="light"] ::selection{background:#d4d4d8;color:#18181b}
[data-theme="light"] ::-webkit-scrollbar-track{background:#f8f8fa}
[data-theme="light"] ::-webkit-scrollbar-thumb{background:#d4d4d8}
[data-theme="light"] .cover h1 span{background:linear-gradient(135deg,#18181b,#52525b);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
[data-theme="light"] .cover .badge{background:rgba(0,0,0,.04);color:#27272a;border-color:rgba(0,0,0,.1)}
[data-theme="light"] .sidebar{background:#fff;border-right-color:#e4e4e7}
[data-theme="light"] .sidebar h2{color:#18181b}
[data-theme="light"] .menu-toggle{background:#fff;color:#27272a;border-color:#e4e4e7}
/* card-title, question, stat-num etc handled by --text-strong variable */
[data-theme="light"] .practice .options li.correct{background:rgba(22,163,74,.08);border-color:rgba(22,163,74,.3);color:#16a34a}
[data-theme="light"] .practice .options li.wrong{background:rgba(220,38,38,.08);border-color:rgba(220,38,38,.3);color:#dc2626}
[data-theme="light"] .box-tip{background:rgba(217,119,6,.05);border-color:rgba(217,119,6,.2)}
[data-theme="light"] .box-warn{background:rgba(220,38,38,.05);border-color:rgba(220,38,38,.2)}
[data-theme="light"] .box-example{background:rgba(37,99,235,.05);border-color:rgba(37,99,235,.2)}
[data-theme="light"] .box-key{background:rgba(22,163,74,.05);border-color:rgba(22,163,74,.2)}
[data-theme="light"] .box-exam{background:rgba(124,58,237,.05);border-color:rgba(124,58,237,.2)}
[data-theme="light"] .login-card h1 span{background:linear-gradient(135deg,#18181b,#52525b);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
[data-theme="light"] .footer strong{color:#27272a}
[data-theme="light"] h2{color:#18181b}
[data-theme="light"] h3{color:#18181b}
[data-theme="light"] h4{color:#27272a}
[data-theme="light"] .sec-overview h2{border-color:#7c3aed;color:#6d28d9}
[data-theme="light"] .sec-html h2{border-color:#c2410c;color:#c2410c}
[data-theme="light"] .sec-css h2{border-color:#0369a1;color:#0369a1}
[data-theme="light"] .sec-js h2{border-color:#a16207;color:#a16207}
[data-theme="light"] .sec-unix h2{border-color:#047857;color:#047857}
[data-theme="light"] .sec-sql h2{border-color:#6d28d9;color:#6d28d9}
[data-theme="light"] .sec-plsql h2{border-color:#be185d;color:#be185d}
[data-theme="light"] .sec-java h2{border-color:#b91c1c;color:#b91c1c}
[data-theme="light"] .sec-jdbc h2{border-color:#9d174d;color:#9d174d}
[data-theme="light"] .sec-servlets h2{border-color:#5b21b6;color:#5b21b6}
[data-theme="light"] .sec-springboot h2{border-color:#15803d;color:#15803d}
[data-theme="light"] .sec-typescript h2{border-color:#1d4ed8;color:#1d4ed8}
[data-theme="light"] .sec-angular h2{border-color:#b91c1c;color:#b91c1c}
[data-theme="light"] .sec-rest h2{border-color:#0f766e;color:#0f766e}
[data-theme="light"] .sec-micro h2{border-color:#0e7490;color:#0e7490}
[data-theme="light"] .sec-coding h2{border-color:#991b1b;color:#991b1b}
[data-theme="light"] .sec-biz h2{border-color:#374151;color:#374151}
[data-theme="light"] .sec-resources h2{border-color:#374151;color:#18181b}
[data-theme="light"] .sidebar a:hover{background:rgba(0,0,0,.04);color:#18181b}
[data-theme="light"] .sidebar a.active{background:rgba(0,0,0,.06);color:#18181b;font-weight:600}
[data-theme="light"] .back-to-top{background:#fff;color:#52525b;border-color:#e4e4e7}
[data-theme="light"] .back-to-top:hover{color:#18181b;border-color:#d4d4d8}
[data-theme="light"] .theme-toggle{background:#fff;border-color:#e4e4e7}
[data-theme="light"] .theme-toggle:hover{border-color:#d4d4d8;color:#18181b}
/* stat-num, step-name handled by --text-strong variable */
[data-theme="light"] .assessment-item:hover{border-color:#a1a1aa}
[data-theme="light"] .assessment-item.highlight{border-color:#7c3aed;box-shadow:0 0 20px rgba(124,58,237,.08)}
[data-theme="light"] .pattern-table th{background:#f2f2f5;color:#18181b}
[data-theme="light"] .exam-overview th{background:#f2f2f5;color:#18181b}
[data-theme="light"] .practice .q-label{color:#52525b}
/* comment-name handled by --text-strong variable */
[data-theme="light"] .sidebar-overlay.active{background:rgba(0,0,0,.3)}
[data-theme="light"] .box .label{font-weight:700}
[data-theme="light"] .box-tip .label{color:#b45309}
[data-theme="light"] .box-warn .label{color:#dc2626}
[data-theme="light"] .box-example .label{color:#2563eb}
[data-theme="light"] .box-key .label{color:#16a34a}
[data-theme="light"] .box-exam .label{color:#7c3aed}
[data-theme="light"] .search-box input{background:#fff;border-color:#e4e4e7;color:#27272a}
[data-theme="light"] .search-box input:focus{border-color:#a1a1aa}
[data-theme="light"] .progress-bar{background:#e4e4e7}
[data-theme="light"] .progress-bar .fill{background:linear-gradient(90deg,#a1a1aa,#52525b)}

/* ── THEME TOGGLE ── */
.theme-toggle{
  position:fixed;bottom:28px;right:80px;
  background:var(--bg-card);color:var(--text-muted);
  border:1px solid var(--border);
  width:44px;height:44px;border-radius:50%;font-size:18px;
  cursor:pointer;z-index:50;display:flex;align-items:center;justify-content:center;
  transition:var(--transition);
}
.theme-toggle:hover{border-color:var(--border-hover);color:var(--text)}
@media(max-width:640px){
  .theme-toggle{width:48px;height:48px;font-size:20px;bottom:20px;right:72px}
}

/* ── RESET ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
::selection{background:#3f3f46;color:var(--text-strong)}
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--text-dim)}

/* ── SIDEBAR ── */
.sidebar{
  position:fixed;top:0;left:0;
  width:var(--sidebar-w);height:100vh;
  background:var(--bg-card);
  border-right:1px solid var(--border);
  overflow-y:auto;padding:24px 16px;
  z-index:100;transition:transform .3s cubic-bezier(.4,0,.2,1);
}
.sidebar:has(.sidebar-nav){
  overflow:hidden;padding:0;
  display:flex;flex-direction:column;
}
.sidebar-nav{
  flex:1;overflow-y:auto;padding:24px 16px;
}
.sidebar h2{
  color:var(--text-strong);font-size:13px;letter-spacing:2px;
  text-transform:uppercase;margin-bottom:20px;
  padding-bottom:12px;border-bottom:1px solid var(--border);
  font-weight:700;
}
.sidebar a{
  display:block;color:var(--text-muted);text-decoration:none;
  padding:7px 12px;border-radius:var(--radius-sm);
  font-size:13px;margin-bottom:1px;transition:var(--transition);
  font-weight:500;
}
.sidebar a:hover{background:var(--accent-glow);color:var(--accent)}
.sidebar a.active{background:var(--accent-glow);color:var(--accent);font-weight:600}
.sidebar .sub{padding-left:20px;font-size:12.5px}
.sidebar .divider{height:1px;background:var(--border);margin:12px 0}
.sidebar .section-label{
  color:var(--text-dim);font-size:10px;text-transform:uppercase;
  letter-spacing:1.5px;padding:10px 12px 4px;font-weight:700;
}

/* ── SIGN IN BUTTON (sidebar bottom) ── */
.sidebar-signin{
  display:block;text-align:center;
  padding:14px 16px;
  background:var(--bg-card);color:var(--accent)!important;
  font-size:13px;font-weight:600;text-decoration:none;
  border-top:1px solid var(--border);
  flex-shrink:0;
}
.sidebar-signin:hover{background:var(--accent-glow)}

/* ── USER PROFILE (sidebar bottom) ── */
.sidebar-user{
  padding:12px 16px;border-top:1px solid var(--border);
  background:var(--bg-card);display:flex;align-items:center;gap:10px;
  flex-shrink:0;
}
.sidebar-user img{width:32px;height:32px;border-radius:50%;object-fit:cover}
.sidebar-user .user-name{font-size:13px;font-weight:600;color:var(--text)}
.sidebar-user .user-email{font-size:11px;color:var(--text-dim)}
.sidebar-user .logout-btn{
  margin-left:auto;background:none;border:none;
  color:var(--text-dim);cursor:pointer;font-size:14px;
  padding:4px;border-radius:4px;transition:var(--transition);
}
.sidebar-user .logout-btn:hover{color:var(--danger)}

/* ── MOBILE MENU ── */
.menu-toggle{
  display:none;position:fixed;top:16px;left:16px;z-index:200;
  background:var(--bg-card);color:var(--text-strong);border:1px solid var(--border);
  padding:8px 12px;border-radius:var(--radius-sm);cursor:pointer;
  font-size:18px;backdrop-filter:blur(8px);transition:var(--transition);
}
.menu-toggle:hover{border-color:var(--accent);color:var(--accent)}

/* ── MAIN ── */
.main{margin-left:var(--sidebar-w);max-width:920px;padding:40px 48px 100px}

/* ── COVER / HERO ── */
.cover{
  text-align:center;padding:72px 32px 56px;margin-bottom:48px;
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius-xl);
  position:relative;overflow:hidden;
}
.cover::before{
  content:'';position:absolute;top:-50%;left:-50%;
  width:200%;height:200%;
  background:radial-gradient(circle at 30% 50%, rgba(255,255,255,.02) 0%, transparent 50%),
             radial-gradient(circle at 70% 80%, rgba(255,255,255,.015) 0%, transparent 50%);
  pointer-events:none;
}
.cover h1{font-size:40px;font-weight:900;margin-bottom:10px;position:relative;letter-spacing:-.5px}
.cover h1 span{
  background:linear-gradient(135deg,#ffffff,#a1a1aa);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}
.cover .sub{font-size:16px;color:var(--text-muted);margin-bottom:24px;position:relative;font-weight:400}
.cover .badge{
  display:inline-block;
  background:rgba(255,255,255,.06);
  color:#d4d4d8;padding:8px 24px;border-radius:24px;
  font-size:13px;font-weight:600;position:relative;
  letter-spacing:.5px;border:1px solid rgba(255,255,255,.1);
}
.cover .meta{margin-top:20px;font-size:12px;color:var(--text-dim);position:relative}

/* ── HEADINGS ── */
h2{
  font-size:26px;font-weight:800;margin:56px 0 16px;
  padding-bottom:10px;border-bottom:2px solid;
  letter-spacing:-.3px;
}
h3{
  font-size:18px;font-weight:700;margin:48px 0 12px;color:var(--text);
  padding-top:24px;border-top:1px solid var(--border);
}
h3:first-of-type{border-top:none;padding-top:0;margin-top:32px}
h4{font-size:15px;font-weight:600;margin:20px 0 8px;color:var(--text-muted)}

/* ── SECTION COLORS ── */
.sec-overview h2{border-color:#71717a;color:#d4d4d8}
.sec-html h2{border-color:#a1674f;color:#c4836a}
.sec-css h2{border-color:#4a7ab5;color:#6a9ad4}
.sec-js h2{border-color:#a89040;color:#c4aa55}
.sec-unix h2{border-color:#3d8b75;color:#5aaa90}
.sec-sql h2{border-color:#6a5ab5;color:#8a7ad4}
.sec-plsql h2{border-color:#a04a7a;color:#c06a9a}
.sec-java h2{border-color:#71717a;color:#a1a1aa}
.sec-jdbc h2{border-color:#a06080;color:#c080a0}
.sec-servlets h2{border-color:#7a75b0;color:#9a95d0}
.sec-springboot h2{border-color:#5a8a45;color:#7aaa65}
.sec-typescript h2{border-color:#3a6a9a;color:#5a8aba}
.sec-angular h2{border-color:#9a3040;color:#ba5060}
.sec-rest h2{border-color:#3a7a70;color:#5a9a90}
.sec-micro h2{border-color:#3a9a95;color:#5abab5}
.sec-coding h2{border-color:#8a3a30;color:#aa5a50}
.sec-biz h2{border-color:#52525b;color:#71717a}
.sec-resources h2{border-color:#3f3f46;color:#a1a1aa}

p{margin-bottom:12px;color:var(--text)}
strong{color:var(--text-strong)}

/* ── CODE ── */
code{
  background:var(--bg-elevated);color:#e5c07b;
  padding:2px 8px;border-radius:4px;
  font-family:'JetBrains Mono','Cascadia Code',monospace;
  font-size:13.5px;border:1px solid var(--border);
}
pre{
  background:var(--bg-surface);color:#abb2bf;
  padding:20px 24px;border-radius:var(--radius);
  overflow-x:auto;margin:14px 0 18px;
  font-family:'JetBrains Mono','Cascadia Code',monospace;
  font-size:13px;line-height:1.7;
  border:1px solid var(--border);
  position:relative;
}
pre::before{
  content:'';position:absolute;top:0;left:0;bottom:0;
  width:3px;background:#3f3f46;border-radius:3px 0 0 3px;
}
pre .kw{color:#c678dd}
pre .str{color:#98c379}
pre .num{color:#d19a66}
pre .cmt{color:#5c6370;font-style:italic}
pre .fn{color:#61afef}
pre .type{color:#e5c07b}

/* ── IDE CODE BLOCK ── */
.ide{
  border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;margin:18px 0;
}
.ide-header{
  display:flex;align-items:center;gap:8px;
  padding:8px 16px;background:var(--bg-elevated);
  border-bottom:1px solid var(--border);
  font-family:'JetBrains Mono','Cascadia Code',monospace;
  font-size:12px;color:var(--text-dim);
}
.ide-header .ide-dots{display:flex;gap:6px}
.ide-header .ide-dots span{width:10px;height:10px;border-radius:50%;display:block}
.ide-header .ide-dots span:nth-child(1){background:#ef4444}
.ide-header .ide-dots span:nth-child(2){background:#f59e0b}
.ide-header .ide-dots span:nth-child(3){background:#22c55e}
.ide-header .ide-filename{margin-left:8px;font-weight:600;color:var(--text-muted)}
.ide pre{
  margin:0;border:none;border-radius:0;
  padding:20px 24px;counter-reset:line;
}
.ide pre::before{display:none}
.ide-explain-btn{
  margin-left:auto;
  background:none;border:1px solid var(--border);
  color:var(--text-dim);padding:3px 12px;border-radius:var(--radius-sm);
  font-size:11px;cursor:pointer;font-family:inherit;font-weight:600;
  transition:var(--transition);letter-spacing:.3px;
}
.ide-explain-btn:hover{border-color:var(--border-hover);color:var(--text)}
.ide-explain-btn.active{border-color:var(--info);color:var(--info)}
.ide-explanation{
  display:none;border-top:1px solid var(--border);
  padding:20px 24px;background:var(--bg-card);
}
.ide-explanation.show{display:block}
.ide-explanation h4{margin-top:0}
.ide-explanation p{font-size:14px;margin-bottom:10px}
.ide-explanation p:last-child{margin-bottom:0}
[data-theme="light"] .ide-header{background:#f0f0f2}
[data-theme="light"] .ide-explain-btn.active{border-color:#2563eb;color:#2563eb}

/* ── TABLES ── */
table{
  width:100%;border-collapse:collapse;margin:16px 0 24px;
  font-size:14px;border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--border);
}
th{
  background:var(--bg-elevated);color:var(--text-strong);
  padding:12px 16px;text-align:left;font-weight:600;
  font-size:13px;text-transform:uppercase;letter-spacing:.5px;
  border-bottom:2px solid #3f3f46;
}
td{padding:10px 16px;border-bottom:1px solid var(--border);color:var(--text)}
tr:nth-child(even){background:rgba(255,255,255,.015)}
tr:hover{background:rgba(255,255,255,.03)}

/* ── BOXES ── */
.box{
  padding:18px 22px;border-radius:var(--radius);margin:18px 0;
  border-left:4px solid;border:1px solid var(--border);
  position:relative;overflow:hidden;
}
.box::before{
  content:'';position:absolute;top:0;left:0;bottom:0;width:4px;
}
.box-tip{background:rgba(245,158,11,.06);border-color:rgba(245,158,11,.2)}
.box-tip::before{background:var(--warning)}
.box-warn{background:rgba(239,68,68,.06);border-color:rgba(239,68,68,.2)}
.box-warn::before{background:var(--danger)}
.box-example{background:rgba(59,130,246,.06);border-color:rgba(59,130,246,.2)}
.box-example::before{background:var(--info)}
.box-key{background:rgba(34,197,94,.06);border-color:rgba(34,197,94,.2)}
.box-key::before{background:var(--success)}
.box-exam{background:rgba(139,92,246,.06);border-color:rgba(139,92,246,.2)}
.box-exam::before{background:var(--purple)}
.box .label{
  font-weight:700;font-size:12px;text-transform:uppercase;
  letter-spacing:.8px;margin-bottom:8px;
}
.box-tip .label{color:var(--warning)}
.box-warn .label{color:var(--danger)}
.box-example .label{color:var(--info)}
.box-key .label{color:var(--success)}
.box-exam .label{color:var(--purple)}

/* ── PRACTICE QUESTIONS ── */
.practice{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);padding:20px 24px;margin:18px 0;
  transition:var(--transition);
}
.practice:hover{border-color:var(--border-hover)}
.practice .q-label{
  font-weight:700;color:var(--accent);font-size:11px;
  text-transform:uppercase;letter-spacing:1px;
}
.practice .question{font-weight:600;margin:10px 0;color:var(--text-strong);font-size:15px}
.practice .options{list-style:upper-alpha;padding-left:24px;margin:10px 0}
.practice .options li{
  padding:8px 12px;color:var(--text-muted);
  border-radius:var(--radius-sm);margin-bottom:4px;
  border:1px solid transparent;transition:var(--transition);
}
.practice .options li:hover{background:rgba(255,255,255,.03);color:var(--text)}
.practice .options li.selected{
  background:rgba(255,255,255,.06);border-color:var(--border-hover);
  color:var(--text-strong);font-weight:600;
}
.practice .options li.correct{
  background:rgba(34,197,94,.1);border-color:rgba(34,197,94,.4);
  color:#22c55e;font-weight:600;
}
.practice .options li.wrong{
  background:rgba(239,68,68,.1);border-color:rgba(239,68,68,.4);
  color:#ef4444;font-weight:600;
}
.practice.answered .options li{cursor:default}
.practice.answered .options li:hover{background:transparent}
.practice.answered .options li.correct{background:rgba(34,197,94,.1)}
.practice.answered .options li.wrong{background:rgba(239,68,68,.1)}
.practice .answer-btn{
  background:var(--bg-elevated);color:var(--text-muted);
  border:1px solid var(--border);
  padding:8px 20px;border-radius:var(--radius-sm);cursor:pointer;
  font-size:13px;margin-top:10px;font-weight:600;
  transition:var(--transition);
}
.practice .answer-btn:hover{border-color:var(--border-hover);color:var(--text);transform:translateY(-1px)}
.practice .answer{
  display:none;margin-top:12px;padding:14px 18px;
  background:rgba(34,197,94,.08);border:1px solid rgba(34,197,94,.2);
  border-radius:var(--radius-sm);font-weight:600;color:var(--success);
  font-size:14px;
}
.practice .answer.show{display:block}

ul,ol{padding-left:24px;margin-bottom:12px}
li{margin-bottom:5px;color:var(--text)}

/* ── ASSESSMENT STRUCTURE ── */
.assessment-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));
  gap:12px;margin:24px 0;
}
.assessment-item{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:16px 12px;text-align:center;
  transition:var(--transition);position:relative;
}
.assessment-item:hover{border-color:var(--accent);transform:translateY(-2px)}
.assessment-item .step-num{
  font-size:10px;color:var(--text-dim);text-transform:uppercase;
  letter-spacing:1px;font-weight:700;
}
.assessment-item .step-name{
  font-size:15px;font-weight:700;color:var(--text-strong);margin:6px 0 4px;
}
.assessment-item .step-desc{font-size:11px;color:var(--text-dim)}
.assessment-item.highlight{border-color:var(--accent);box-shadow:var(--shadow-glow)}

/* ── EXAM PATTERN TABLE ── */
.pattern-table{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border)}
.pattern-table th{background:#1a1a1e;border-bottom:none}

/* ── TIMELINE (legacy compat) ── */
.timeline{display:flex;gap:0;margin:20px 0 24px;flex-wrap:wrap}
.timeline .step{
  flex:1;min-width:100px;padding:14px 8px;text-align:center;
  background:var(--bg-card);border-right:1px solid var(--border);
  font-size:12px;
}
.timeline .step:first-child{border-radius:var(--radius) 0 0 var(--radius)}
.timeline .step:last-child{border-radius:0 var(--radius) var(--radius) 0;border-right:none}
.timeline .step .day{font-weight:700;color:#a1a1aa;font-size:10px;text-transform:uppercase;letter-spacing:1px}
.timeline .step .name{font-weight:700;margin-top:4px;color:var(--text-strong)}

/* ── BACK TO TOP ── */
.back-to-top{
  position:fixed;bottom:28px;right:28px;
  background:#1a1a1e;color:#a1a1aa;border:1px solid #2e2e34;
  width:44px;height:44px;border-radius:50%;font-size:18px;
  cursor:pointer;display:none;z-index:50;
  box-shadow:0 4px 16px rgba(0,0,0,.4);
  transition:var(--transition);
}
.back-to-top:hover{transform:translateY(-3px);box-shadow:0 6px 24px rgba(0,0,0,.5);color:var(--text-strong);border-color:#52525b}
.back-to-top.visible{display:flex;align-items:center;justify-content:center}

/* ── SEARCH ── */
.search-box{padding:8px 0 20px}
.search-box input{
  width:100%;padding:9px 14px;
  border:1px solid var(--border);border-radius:var(--radius-sm);
  background:var(--bg-surface);color:var(--text);
  font-size:13px;outline:none;font-family:inherit;
  transition:var(--transition);
}
.search-box input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}
.search-box input::placeholder{color:var(--text-dim)}

/* ── PROGRESS BAR ── */
.progress-bar{height:2px;background:var(--border);margin:0 12px 18px;border-radius:2px;overflow:hidden}
.progress-bar .fill{height:100%;background:linear-gradient(90deg,#52525b,#a1a1aa);transition:width .3s}

/* ── FOOTER ── */
.footer{
  text-align:center;margin-top:56px;padding:28px;
  border-top:1px solid var(--border);color:var(--text-dim);font-size:13px;
}
.footer a{color:var(--text-muted);text-decoration:none;transition:var(--transition)}
.footer a:hover{color:var(--accent)}
.footer strong{color:var(--text)}
.footer small{color:var(--text-dim)}

/* ── NAV CARDS ── */
.nav-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:16px;margin:24px 0}
.nav-card{
  background:var(--bg-card);border-radius:var(--radius);
  padding:24px;border:1px solid var(--border);
  transition:var(--transition);text-decoration:none;color:inherit;display:block;
  position:relative;overflow:hidden;
}
.nav-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,rgba(255,255,255,.15),transparent);
  opacity:0;transition:var(--transition);
}
.nav-card:hover{
  border-color:var(--border-hover);
  transform:translateY(-3px);
  box-shadow:var(--shadow-lg);
}
.nav-card:hover::before{opacity:1}
.nav-card .card-icon{font-size:32px;margin-bottom:12px;display:block}
.nav-card .card-title{font-size:16px;font-weight:700;margin-bottom:6px;color:var(--text-strong)}
.nav-card .card-desc{font-size:13px;color:var(--text-muted);line-height:1.5}
.nav-card .card-tag{
  display:inline-block;font-size:10px;padding:3px 10px;
  border-radius:20px;margin-top:10px;font-weight:600;
  letter-spacing:.5px;text-transform:uppercase;
}
.tag-fa{background:rgba(161,161,170,.08);color:#a1a1aa;border:1px solid rgba(161,161,170,.15)}
.tag-pra{background:rgba(161,161,170,.08);color:#a1a1aa;border:1px solid rgba(161,161,170,.15)}
.tag-hse{background:rgba(161,161,170,.08);color:#a1a1aa;border:1px solid rgba(161,161,170,.15)}
.tag-sprint{background:rgba(161,161,170,.08);color:#a1a1aa;border:1px solid rgba(161,161,170,.15)}

/* ── STAT CARDS (admin + overview) ── */
.stat-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin:24px 0}
.stat-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:20px;text-align:center;
}
.stat-card .stat-num{font-size:32px;font-weight:900;color:var(--text-strong);line-height:1}
.stat-card .stat-label{font-size:12px;color:var(--text-dim);margin-top:6px;text-transform:uppercase;letter-spacing:.5px;font-weight:600}

/* ── COMMENTS ── */
.comments-section{margin-top:48px;padding-top:32px;border-top:1px solid var(--border)}
.comments-section h3{color:var(--text-strong);margin-bottom:20px}
.comment-form{display:flex;gap:12px;margin-bottom:24px}
.comment-form textarea{
  flex:1;background:var(--bg-surface);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:12px 16px;color:var(--text);
  font-family:inherit;font-size:14px;resize:vertical;min-height:60px;
  outline:none;transition:var(--transition);
}
.comment-form textarea:focus{border-color:var(--accent)}
.comment-form button{
  align-self:flex-end;background:var(--accent);color:#fff;border:none;
  padding:10px 24px;border-radius:var(--radius-sm);cursor:pointer;
  font-weight:600;font-size:13px;transition:var(--transition);white-space:nowrap;
}
.comment-form button:hover{background:var(--accent-hover)}
.comment-list{display:flex;flex-direction:column;gap:12px}
.comment{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:14px 18px;
}
.comment .comment-header{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.comment .comment-avatar{
  width:28px;height:28px;border-radius:50%;
  background:var(--accent-glow);display:flex;align-items:center;
  justify-content:center;font-size:12px;font-weight:700;color:var(--accent);
}
.comment .comment-name{font-size:13px;font-weight:600;color:var(--text-strong)}
.comment .comment-time{font-size:11px;color:var(--text-dim);margin-left:auto}
.comment .comment-body{font-size:14px;color:var(--text-muted);line-height:1.6}

/* ── RESOURCES PANEL ── */
.resources-panel{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:24px;margin:24px 0;
}
.resources-panel h4{color:var(--text-strong);margin-bottom:16px;font-size:16px}
.resource-links{display:flex;flex-direction:column;gap:8px}
.resource-link{
  display:flex;align-items:center;gap:10px;
  padding:10px 14px;border-radius:var(--radius-sm);
  background:var(--bg-surface);border:1px solid var(--border);
  color:var(--text);text-decoration:none;font-size:13px;
  transition:var(--transition);font-weight:500;
}
.resource-link:hover{border-color:var(--accent);color:var(--accent);transform:translateX(4px)}
.resource-link .r-icon{font-size:16px;flex-shrink:0}
.resource-link .r-tag{
  margin-left:auto;font-size:10px;padding:2px 8px;
  border-radius:12px;background:var(--accent-glow);color:var(--accent);
  font-weight:600;text-transform:uppercase;letter-spacing:.5px;
}

/* ── VIDEO EMBED ── */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;margin:20px 0}
.video-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;transition:var(--transition);
}
.video-card:hover{border-color:var(--border-hover);transform:translateY(-2px)}
.video-card iframe{width:100%;aspect-ratio:16/9;border:none;display:block}
.video-card .video-title{padding:12px 16px;font-size:13px;font-weight:600;color:var(--text)}

/* ── LOGIN PAGE ── */
.login-page{
  min-height:100vh;display:flex;align-items:center;justify-content:center;
  background:var(--bg);position:relative;overflow:hidden;
}
.login-page::before{
  content:'';position:absolute;width:600px;height:600px;
  background:radial-gradient(circle,rgba(255,255,255,.02),transparent 60%);
  top:-100px;right:-100px;
}
.login-page::after{
  content:'';position:absolute;width:400px;height:400px;
  background:radial-gradient(circle,rgba(255,255,255,.015),transparent 60%);
  bottom:-50px;left:-50px;
}
.login-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-xl);padding:48px 40px;
  width:100%;max-width:420px;position:relative;z-index:1;
  box-shadow:var(--shadow-lg);
}
.login-card h1{font-size:28px;font-weight:900;text-align:center;margin-bottom:4px;color:var(--text-strong)}
.login-card h1 span{
  background:linear-gradient(135deg,#ffffff,#a1a1aa);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.login-card .login-sub{text-align:center;color:var(--text-dim);font-size:14px;margin-bottom:32px}
.login-card .form-group{margin-bottom:20px}
.login-card label{display:block;font-size:13px;font-weight:600;color:var(--text-muted);margin-bottom:6px}
.login-card input[type="email"],
.login-card input[type="password"],
.login-card input[type="text"]{
  width:100%;padding:12px 16px;
  background:var(--bg-surface);border:1px solid var(--border);
  border-radius:var(--radius-sm);color:var(--text);
  font-size:14px;font-family:inherit;outline:none;
  transition:var(--transition);
}
.login-card input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}
.login-card .btn-primary{
  width:100%;padding:13px;background:var(--accent);color:#fff;
  border:none;border-radius:var(--radius-sm);font-size:15px;
  font-weight:700;cursor:pointer;transition:var(--transition);
  margin-top:8px;
}
.login-card .btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px)}
.login-card .btn-google{
  width:100%;padding:12px;
  background:var(--bg-surface);color:var(--text);
  border:1px solid var(--border);border-radius:var(--radius-sm);
  font-size:14px;font-weight:600;cursor:pointer;
  transition:var(--transition);margin-top:12px;
  display:flex;align-items:center;justify-content:center;gap:10px;
  font-family:inherit;
}
.login-card .btn-google:hover{border-color:var(--border-hover);background:var(--bg-elevated)}
.login-card .divider-text{
  text-align:center;color:var(--text-dim);font-size:12px;
  margin:20px 0;position:relative;
}
.login-card .divider-text::before,.login-card .divider-text::after{
  content:'';position:absolute;top:50%;width:40%;height:1px;background:var(--border);
}
.login-card .divider-text::before{left:0}
.login-card .divider-text::after{right:0}
.login-card .login-footer{text-align:center;margin-top:24px;font-size:13px;color:var(--text-dim)}
.login-card .login-footer a{color:var(--accent);text-decoration:none;font-weight:600}
.login-card .login-footer a:hover{text-decoration:underline}

/* ── ADMIN DASHBOARD ── */
.admin-header{
  display:flex;align-items:center;justify-content:space-between;
  margin-bottom:32px;flex-wrap:wrap;gap:16px;
}
.admin-header h2{margin:0;border:none;padding:0}
.admin-badge{
  background:var(--accent-glow);color:var(--accent);
  padding:4px 14px;border-radius:20px;font-size:12px;
  font-weight:700;border:1px solid rgba(255,255,255,.1);
}
.admin-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;margin:24px 0}
.admin-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:24px;
}
.admin-card h4{color:var(--text-strong);margin-bottom:16px;font-size:15px;font-weight:700}
.user-list{display:flex;flex-direction:column;gap:8px}
.user-row{
  display:flex;align-items:center;gap:10px;
  padding:8px 12px;border-radius:var(--radius-sm);
  background:var(--bg-surface);font-size:13px;
}
.user-row .user-dot{width:8px;height:8px;border-radius:50%;background:var(--success)}
.user-row .user-dot.offline{background:var(--text-dim)}

/* ── EXAM OVERVIEW (simplified) ── */
.exam-overview{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.exam-overview th{background:#1a1a1e;border-bottom:none}

/* ── PRINT ── */
@media print{
  :root{--bg:#fff;--text:#1a1a2e;--bg-card:#fff;--border:#e0e0e0}
  .sidebar,.menu-toggle,.back-to-top,.comment-form,.login-page{display:none}
  .main{margin-left:0;max-width:100%;padding:20px}
  .cover{break-after:page}h2{break-before:page}
  .practice .answer{display:block!important}.answer-btn{display:none}
  pre{white-space:pre-wrap;border:1px solid #ccc}
  body{font-size:12px;color:#1a1a2e;background:#fff}
  .nav-card,.box,.practice{border:1px solid #ddd}
}

/* ── TABLET (max 900px) ── */
@media(max-width:900px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0);box-shadow:4px 0 24px rgba(0,0,0,.5)}
  .sidebar-overlay{
    display:none;position:fixed;inset:0;
    background:rgba(0,0,0,.5);z-index:99;
    backdrop-filter:blur(2px);-webkit-backdrop-filter:blur(2px);
  }
  .sidebar-overlay.active{display:block}
  .menu-toggle{display:block}
  .main{margin-left:0;padding:24px 16px 80px}
  .cover h1{font-size:26px}
  .cover{padding:48px 20px 40px;border-radius:var(--radius)}
  .nav-cards{grid-template-columns:repeat(2,1fr);gap:12px}
  .stat-row{grid-template-columns:repeat(3,1fr);gap:10px}
  .assessment-grid{grid-template-columns:repeat(3,1fr);gap:10px}
  .video-grid{grid-template-columns:1fr}
  .login-card{margin:20px;padding:32px 24px}
  .comment-form{flex-direction:column}
  .admin-grid{grid-template-columns:1fr}
  h2{font-size:22px;margin:40px 0 12px}
  h3{font-size:16px;margin:24px 0 10px}

  /* Tables scroll horizontally on mobile */
  table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;white-space:nowrap}
  thead{display:table;width:100%}
  tbody{display:table;width:100%}
  th,td{padding:8px 12px;font-size:13px}

  /* Code blocks scroll */
  pre{font-size:12.5px;padding:14px 16px;border-radius:var(--radius-sm)}
  code{font-size:12.5px;padding:1px 5px}

  /* Boxes compact */
  .box{padding:14px 16px;margin:14px 0}
  .practice{padding:16px 18px}

  /* Resource links stack better */
  .resource-link{padding:12px 14px;font-size:13px}
  .resource-link .r-tag{display:none}
}

/* ── MOBILE (max 640px) ── */
@media(max-width:640px){
  .main{padding:16px 12px 80px}
  .cover{padding:40px 16px 32px;margin-bottom:28px;border-radius:var(--radius-sm)}
  .cover h1{font-size:22px;letter-spacing:-.3px}
  .cover .sub{font-size:14px;margin-bottom:16px}
  .cover .badge{font-size:12px;padding:6px 18px}
  .cover .meta{font-size:11px}

  h2{font-size:20px;margin:32px 0 10px;padding-bottom:8px}
  h3{font-size:15px;margin:20px 0 8px}
  h4{font-size:14px}
  p{font-size:14px;margin-bottom:10px}
  li{font-size:14px}

  /* Single column everything */
  .nav-cards{grid-template-columns:1fr;gap:10px}
  .nav-card{padding:16px}
  .nav-card .card-icon{font-size:24px;margin-bottom:8px}
  .nav-card .card-title{font-size:15px}
  .nav-card .card-desc{font-size:12px}
  .nav-card .card-tag{font-size:9px;padding:2px 8px;margin-top:8px}

  .stat-row{grid-template-columns:repeat(3,1fr);gap:8px}
  .stat-card{padding:14px 8px}
  .stat-card .stat-num{font-size:24px}
  .stat-card .stat-label{font-size:10px;margin-top:4px}

  .assessment-grid{grid-template-columns:repeat(2,1fr);gap:8px}
  .assessment-item{padding:12px 8px}
  .assessment-item .step-name{font-size:13px}
  .assessment-item .step-num{font-size:9px}
  .assessment-item .step-desc{font-size:10px}

  /* Tables */
  table{font-size:12px;margin:10px 0 16px}
  th{padding:8px 10px;font-size:11px;letter-spacing:.3px}
  td{padding:7px 10px}

  /* Code */
  pre{font-size:11.5px;padding:12px 14px;line-height:1.6;margin:10px 0 14px}
  code{font-size:12px}

  /* Boxes */
  .box{padding:12px 14px;margin:12px 0;border-radius:var(--radius-sm)}
  .box .label{font-size:11px;margin-bottom:5px}

  /* Practice questions */
  .practice{padding:14px 16px;margin:12px 0}
  .practice .q-label{font-size:10px}
  .practice .question{font-size:14px;margin:6px 0}
  .practice .options{font-size:13px;padding-left:20px}
  .practice .answer-btn{padding:8px 18px;font-size:12px;width:100%}
  .practice .answer{font-size:13px;padding:10px 14px}

  /* Videos */
  .video-grid{grid-template-columns:1fr;gap:12px}
  .video-card .video-title{padding:10px 14px;font-size:12px}

  /* Resources */
  .resources-panel{padding:16px;margin:16px 0}
  .resources-panel h4{font-size:14px;margin-bottom:12px}
  .resource-links{gap:6px}
  .resource-link{padding:10px 12px;font-size:12px;gap:8px}
  .resource-link .r-icon{font-size:14px}

  /* Comments */
  .comments-section{margin-top:32px;padding-top:24px}
  .comment{padding:12px 14px}
  .comment .comment-body{font-size:13px}
  .comment-form textarea{min-height:50px;font-size:13px;padding:10px 12px}
  .comment-form button{padding:10px 20px;width:100%}

  /* Footer */
  .footer{padding:20px 12px;font-size:12px;margin-top:32px}

  /* Login */
  .login-card{margin:12px;padding:28px 20px}
  .login-card h1{font-size:24px}
  .login-card .login-sub{font-size:13px;margin-bottom:24px}
  .login-card input[type="email"],
  .login-card input[type="password"],
  .login-card input[type="text"]{padding:11px 14px;font-size:14px}
  .login-card .btn-primary{padding:12px;font-size:14px}
  .login-card .btn-google{padding:11px;font-size:13px}

  /* Admin */
  .admin-header h2{font-size:20px}
  .admin-card{padding:16px}

  /* Menu toggle bigger touch target */
  .menu-toggle{padding:10px 14px;font-size:20px;top:12px;left:12px}

  /* Back to top — bigger touch target on mobile */
  .back-to-top{width:48px;height:48px;font-size:20px;bottom:20px;right:16px}
}

/* ── SMALL PHONES (max 380px) ── */
@media(max-width:380px){
  .main{padding:12px 8px 72px}
  .cover h1{font-size:19px}
  .cover{padding:32px 12px 24px}
  .stat-row{grid-template-columns:repeat(3,1fr);gap:6px}
  .stat-card{padding:10px 6px}
  .stat-card .stat-num{font-size:20px}
  .stat-card .stat-label{font-size:9px}
  .assessment-grid{grid-template-columns:repeat(2,1fr);gap:6px}
  .nav-card{padding:14px}
  pre{font-size:11px;padding:10px 12px}
  table{font-size:11px}
  th,td{padding:6px 8px}
  h2{font-size:18px}
  .box{padding:10px 12px}
  .practice{padding:12px 14px}
  .login-card{margin:8px;padding:24px 16px}
}

/* ── TOUCH IMPROVEMENTS ── */
@media(hover:none) and (pointer:coarse){
  /* Bigger tap targets on touch devices */
  .sidebar a{padding:10px 12px;font-size:14px;margin-bottom:2px}
  .sidebar .sub{padding-left:20px;font-size:13px}
  .practice .answer-btn{padding:12px 24px;font-size:14px}
  .resource-link{padding:14px 16px;min-height:48px}
  .comment-form button{padding:14px 24px;font-size:14px}
  .nav-card{padding:20px}
  .back-to-top{width:52px;height:52px;font-size:22px}
  .menu-toggle{padding:12px 16px;font-size:22px}
  .login-card .btn-primary,.login-card .btn-google{padding:14px;font-size:15px;min-height:48px}
  .login-card input[type="email"],
  .login-card input[type="password"],
  .login-card input[type="text"]{padding:14px 16px;font-size:16px}
  .search-box input{padding:12px 14px;font-size:14px}
  .assessment-item{padding:14px 10px}

  /* Prevent iOS zoom on input focus */
  input,textarea,select{font-size:16px!important}
}

/* ── PAYWALL & CONTENT LOCKING ── */
.locked-content{
  display:none!important;
  filter:blur(5px);
  opacity:.5;
  transition:filter .3s,opacity .3s;
}
#paywall{
  position:relative;
  padding-top:40px;
  z-index:40;
}
.paywall-card{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:48px 32px;
  text-align:center;
  max-width:440px;
  margin:0 auto;
}
.paywall-lock{
  font-size:48px;
  margin-bottom:16px;
}
.paywall-card h3{
  font-size:22px;
  margin:0 0 12px;
  color:var(--text-strong);
}
.paywall-desc{
  font-size:14px;
  color:var(--text-dim);
  margin-bottom:24px;
  line-height:1.6;
}
.paywall-price{
  font-size:36px;
  font-weight:800;
  color:var(--text-strong);
  margin-bottom:8px;
}
.paywall-price span{
  font-size:14px;
  font-weight:400;
  color:var(--text-dim);
}
.paywall-btn{
  display:inline-block;
  padding:14px 40px;
  background:#22c55e;
  color:#fff;
  border:none;
  border-radius:var(--radius-sm);
  font-size:16px;
  font-weight:700;
  cursor:pointer;
  margin:16px 0 12px;
  transition:background .2s;
  font-family:inherit;
}
.paywall-btn:hover{background:#16a34a}
.paywall-note{
  font-size:12px;
  color:var(--text-muted);
  margin-top:4px;
}
[data-theme="light"] .paywall-card{background:#fff;border-color:#e4e4e7}
[data-theme="light"] .paywall-fade{background:linear-gradient(to bottom,transparent,#f4f4f5)}
[data-theme="light"] .locked-content{opacity:.4}