/* ============================================================
   MSS Hub — Management of Software Systems
   Premium Dark Theme Study Dashboard
   ============================================================ */

:root {
    --bg: #0a0a12;
    --bg2: #11111b;
    --bg3: #1a1a2e;
    --bg4: #252540;
    --surface: #14142a;
    --surface2: #1c1c38;
    --text: #e8e8f0;
    --text2: #a0a0c0;
    --text3: #6a6a8e;
    --accent: #6c63ff;
    --accent2: #a78bfa;
    --green: #10b981;
    --red: #f43f5e;
    --orange: #f59e0b;
    --cyan: #06b6d4;
    --pink: #ec4899;
    --m1: #6c63ff;
    --m2: #10b981;
    --m3: #f59e0b;
    --m4: #ec4899;
    --m5: #06b6d4;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(108, 99, 255, 0.4); color: #fff; }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--bg4); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

a { color: inherit; text-decoration: none; }

/* --- Topbar --- */
.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 18, 0.82);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(108, 99, 255, 0.15);
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-weight: 800;
    font-size: 1.15rem;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
}

.nav {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.nav a {
    color: var(--text2);
    text-decoration: none;
    font-size: .78rem;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 8px;
    transition: .2s;
    white-space: nowrap;
}

.nav a:hover, .nav a.active {
    background: var(--bg3);
    color: var(--text);
}

.hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
}

/* --- Main Container --- */
.main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px 40px;
}

.section { display: none; }
.section.active { display: block; }

/* --- Hero Title --- */
.hero-title {
    font-size: 2.8rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent), var(--pink), var(--cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 6px;
    line-height: 1.1;
}

.subtitle {
    color: var(--text2);
    font-size: 1.05rem;
    margin-bottom: 32px;
    font-weight: 400;
}

.sec-heading {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.sec-sub {
    color: var(--text3);
    font-size: .85rem;
    margin-bottom: 16px;
}

/* --- Stats Grid --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 16px;
    margin-bottom: 36px;
}

.stat-card {
    background: var(--surface);
    border: 1px solid rgba(108, 99, 255, 0.1);
    border-radius: 14px;
    padding: 20px;
    text-align: center;
    transition: .3s;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(108, 99, 255, 0.12);
}

.stat-num {
    font-size: 2.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: .8rem;
    color: var(--text3);
    margin-top: 4px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: .5px;
}

/* --- Progress Bars --- */
.progress-section { margin-bottom: 36px; }
.progress-section h2 { font-size: 1.3rem; font-weight: 700; margin-bottom: 16px; }

.prog-bar-wrap { margin-bottom: 12px; }
.prog-label { display: flex; justify-content: space-between; font-size: .82rem; margin-bottom: 5px; color: var(--text2); }
.prog-bar { height: 8px; background: var(--bg3); border-radius: 4px; overflow: hidden; }
.prog-fill { height: 100%; border-radius: 4px; transition: width .5s ease; }

/* --- Formulas Box --- */
.formulas-box {
    background: var(--surface);
    border-left: 3px solid var(--accent);
    border-radius: 0 12px 12px 0;
    padding: 20px 24px;
    margin-bottom: 24px;
}

.formulas-box h3 { font-size: 1rem; font-weight: 700; margin-bottom: 12px; color: var(--accent2); }

.formula-item {
    font-family: 'JetBrains Mono', monospace;
    font-size: .82rem;
    color: var(--cyan);
    background: var(--bg3);
    padding: 8px 14px;
    border-radius: 8px;
    margin-bottom: 6px;
    line-height: 1.5;
}

/* --- Search Bar --- */
.search-bar {
    width: 100%;
    padding: 12px 18px;
    background: var(--bg3);
    border: 1px solid var(--bg4);
    border-radius: 12px;
    color: var(--text);
    font-size: .92rem;
    outline: none;
    margin-bottom: 20px;
    font-family: 'Inter', sans-serif;
    transition: .3s;
}

.search-bar:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.15);
}

/* --- Module Cards (Topics) --- */
.module-card {
    background: var(--surface);
    border-radius: 14px;
    margin-bottom: 14px;
    overflow: hidden;
    border: 1px solid rgba(108, 99, 255, 0.08);
}

.module-header {
    padding: 16px 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: .2s;
    user-select: none;
}

.module-header:hover { background: var(--surface2); }

.module-header h3 {
    font-size: 1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.module-badge {
    font-size: .72rem;
    padding: 3px 10px;
    border-radius: 20px;
    font-weight: 600;
}

.module-body { padding: 0 20px 16px; display: none; }
.module-body.open { display: block; }

.topic-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(108, 99, 255, 0.06);
}

.topic-item:last-child { border-bottom: none; }

.topic-cb {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
    margin-top: 3px;
    flex-shrink: 0;
}

.topic-info { flex: 1; }

.topic-text {
    font-size: .88rem;
    color: var(--text);
    line-height: 1.45;
    margin-bottom: 4px;
}

.topic-text.checked {
    text-decoration: line-through;
    opacity: 0.5;
}

.tag {
    font-size: .65rem;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .3px;
    display: inline-block;
    margin-right: 6px;
}

.tag.critical { background: rgba(244, 63, 94, 0.15); color: var(--red); }
.tag.high { background: rgba(245, 158, 11, 0.15); color: var(--orange); }
.tag.medium { background: rgba(108, 99, 255, 0.15); color: var(--accent2); }
.tag.low { background: rgba(106, 106, 142, 0.15); color: var(--text3); }

.freq-line { font-size: .72rem; color: var(--text3); margin-top: 2px; }

/* --- Frequency Table --- */
.freq-table-wrap {
    overflow-x: auto;
    border-radius: 14px;
    border: 1px solid rgba(108, 99, 255, 0.08);
}

.freq-table { width: 100%; border-collapse: collapse; font-size: .82rem; }

.freq-table th {
    background: var(--surface);
    padding: 10px 12px;
    text-align: left;
    font-weight: 600;
    color: var(--text2);
    border-bottom: 2px solid var(--bg4);
    position: sticky;
    top: 60px;
    z-index: 10;
}

.freq-table td { padding: 8px 12px; border-bottom: 1px solid rgba(108, 99, 255, 0.06); color: var(--text2); }
.freq-table tr:hover td { background: var(--surface); }
.freq-table .mod-row td { background: var(--bg3); font-weight: 700; color: var(--accent2); font-size: .85rem; }

.freq-check { color: var(--green); font-weight: 700; font-size: .95rem; }
.freq-miss { color: var(--text3); }

.cnt-4, .cnt-5 { color: var(--red); font-weight: 700; }
.cnt-3 { color: var(--orange); font-weight: 700; }
.cnt-2 { color: var(--accent2); font-weight: 600; }
.cnt-1 { color: var(--text3); }

/* --- Tabs --- */
.tabs { display: flex; gap: 6px; margin-bottom: 20px; flex-wrap: wrap; }

.tab-btn {
    padding: 8px 18px;
    border-radius: 10px;
    border: 1px solid var(--bg4);
    background: var(--surface);
    color: var(--text2);
    cursor: pointer;
    font-size: .82rem;
    font-weight: 500;
    transition: .2s;
    font-family: 'Inter', sans-serif;
}

.tab-btn:hover, .tab-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* --- Notes Grid --- */
.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 14px;
}

.note-card {
    background: var(--surface);
    border: 1px solid rgba(108, 99, 255, 0.08);
    border-radius: 14px;
    padding: 20px;
    transition: .3s;
    text-decoration: none;
    color: var(--text);
    display: block;
}

.note-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(108, 99, 255, 0.12);
    border-color: var(--accent);
}

.note-icon { font-size: 2rem; margin-bottom: 10px; }
.note-name { font-size: .92rem; font-weight: 600; margin-bottom: 4px; }
.note-meta { font-size: .72rem; color: var(--text3); }

/* --- PYQ Grid --- */
.pyq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 14px;
    margin-bottom: 28px;
}

.pyq-card {
    background: var(--surface);
    border: 1px solid rgba(108, 99, 255, 0.08);
    border-radius: 14px;
    padding: 20px;
    transition: .3s;
    text-decoration: none;
    color: var(--text);
    display: block;
}

.pyq-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(108, 99, 255, 0.12);
    border-color: var(--accent);
}

.pyq-card h4 { font-size: .95rem; font-weight: 700; margin-bottom: 4px; }
.pyq-card p { font-size: .78rem; color: var(--text3); }

/* --- Exam Pattern Box --- */
.exam-pattern-box {
    background: var(--surface);
    border-radius: 14px;
    padding: 24px;
    border: 1px solid rgba(108, 99, 255, 0.08);
}

.exam-pattern-box h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 16px; color: var(--accent2); }

.pattern-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.pattern-part h4 { font-size: .95rem; font-weight: 700; margin-bottom: 8px; }
.pattern-part p { font-size: .82rem; color: var(--text2); line-height: 1.6; }

/* --- Repeated Questions --- */
.rq-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.rq-stat {
    background: var(--surface);
    border: 1px solid rgba(108, 99, 255, 0.08);
    border-radius: 12px;
    padding: 16px;
    text-align: center;
}

.rq-stat-num {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.rq-stat-label { font-size: .72rem; color: var(--text3); margin-top: 2px; text-transform: uppercase; letter-spacing: .5px; font-weight: 500; }

.rq-filters { display: flex; gap: 6px; margin-bottom: 16px; flex-wrap: wrap; }

.rq-filter-btn {
    padding: 7px 16px;
    border-radius: 10px;
    border: 1px solid var(--bg4);
    background: var(--surface);
    color: var(--text2);
    cursor: pointer;
    font-size: .8rem;
    font-weight: 500;
    transition: .2s;
    font-family: 'Inter', sans-serif;
}

.rq-filter-btn:hover, .rq-filter-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.rq-module-group { margin-bottom: 20px; }

.rq-module-title {
    font-size: 1.05rem;
    font-weight: 700;
    padding: 12px 0 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.rq-mod-badge { font-size: .7rem; padding: 3px 10px; border-radius: 12px; font-weight: 600; }

.rq-card {
    background: var(--surface);
    border: 1px solid rgba(108, 99, 255, 0.08);
    border-radius: 12px;
    padding: 16px 18px;
    margin-bottom: 10px;
    transition: .3s;
    position: relative;
    overflow: hidden;
}

.rq-card:hover {
    border-color: rgba(108, 99, 255, 0.25);
    box-shadow: 0 4px 20px rgba(108, 99, 255, 0.08);
    transform: translateY(-1px);
}

.rq-card::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; }
.rq-card.rq-m1::before { background: var(--m1); }
.rq-card.rq-m2::before { background: var(--m2); }
.rq-card.rq-m3::before { background: var(--m3); }
.rq-card.rq-m4::before { background: var(--m4); }
.rq-card.rq-m5::before { background: var(--m5); }

.rq-question { font-size: .88rem; color: var(--text); line-height: 1.5; margin-bottom: 8px; padding-right: 80px; }
.rq-meta { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

.rq-heat {
    position: absolute;
    top: 14px;
    right: 14px;
    font-size: .72rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 8px;
    letter-spacing: .3px;
}

.rq-heat-3 { background: rgba(244, 63, 94, 0.2); color: var(--red); }
.rq-heat-2 { background: rgba(245, 158, 11, 0.18); color: var(--orange); }
.rq-heat-1 { background: rgba(106, 106, 142, 0.18); color: var(--text3); }

.rq-paper-tag {
    font-size: .65rem;
    padding: 2px 7px;
    border-radius: 6px;
    background: var(--bg3);
    color: var(--text3);
    font-weight: 500;
    transition: 0.2s;
    cursor: pointer;
}

.rq-paper-tag:hover { background: var(--accent); color: #fff; }

.rq-marks-tag { font-size: .65rem; padding: 2px 8px; border-radius: 6px; font-weight: 600; }
.rq-marks-3 { background: rgba(16, 185, 129, 0.12); color: var(--green); }
.rq-marks-14 { background: rgba(236, 72, 153, 0.12); color: var(--pink); }
.rq-marks-mixed { background: rgba(6, 182, 212, 0.12); color: var(--cyan); }

/* --- Predicted --- */
.predict-section { margin-bottom: 28px; }
.predict-section h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 14px; color: var(--accent2); }

.predict-item {
    background: var(--surface);
    border-radius: 12px;
    padding: 14px 18px;
    margin-bottom: 10px;
    border-left: 3px solid var(--accent);
    font-size: .88rem;
    color: var(--text);
    line-height: 1.5;
}

.predict-item .marks {
    float: right;
    font-size: .72rem;
    background: var(--bg3);
    padding: 2px 10px;
    border-radius: 8px;
    color: var(--orange);
    font-weight: 600;
}

.predict-mod { font-weight: 700; color: var(--accent2); margin-bottom: 8px; font-size: .92rem; }

/* --- Study Plan --- */
.day-card {
    background: var(--surface);
    border-radius: 14px;
    margin-bottom: 18px;
    overflow: hidden;
    border: 1px solid rgba(108, 99, 255, 0.08);
}

.day-header { padding: 16px 20px; font-weight: 800; font-size: 1.05rem; }

.time-block { padding: 12px 20px; border-top: 1px solid rgba(108, 99, 255, 0.06); }
.time-block h4 { font-size: .85rem; font-weight: 700; color: var(--accent2); margin-bottom: 8px; }

.plan-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 5px 0;
    font-size: .84rem;
    color: var(--text2);
}

.plan-cb {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    cursor: pointer;
    margin-top: 2px;
    flex-shrink: 0;
}

.plan-text.checked {
    text-decoration: line-through;
    opacity: 0.5;
}

/* --- Syllabus Table --- */
.syl-table { width: 100%; border-collapse: collapse; margin-bottom: 24px; }

.syl-table th {
    background: var(--surface);
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    font-size: .82rem;
    color: var(--text2);
    border-bottom: 2px solid var(--bg4);
}

.syl-table td {
    padding: 10px 14px;
    border-bottom: 1px solid rgba(108, 99, 255, 0.06);
    font-size: .85rem;
    color: var(--text2);
    vertical-align: top;
}

.syl-table tr:hover td { background: var(--surface); }

.textbooks-box {
    background: var(--surface);
    border-radius: 14px;
    padding: 24px;
    border: 1px solid rgba(108, 99, 255, 0.08);
}

.textbooks-box h3 { font-size: 1.05rem; margin-bottom: 12px; color: var(--accent2); font-weight: 700; }
.textbooks-box li { font-size: .85rem; color: var(--text2); margin-bottom: 8px; line-height: 1.5; }
.textbooks-box ul { padding-left: 20px; }

/* --- Timer --- */
.timer-display {
    font-family: 'JetBrains Mono', monospace;
    font-size: 5.5rem;
    font-weight: 600;
    text-align: center;
    background: linear-gradient(135deg, var(--accent), var(--pink), var(--cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 40px 0 24px;
    letter-spacing: -2px;
}

.timer-presets { display: flex; gap: 10px; justify-content: center; margin-bottom: 24px; flex-wrap: wrap; }

.preset-btn {
    padding: 8px 20px;
    border-radius: 10px;
    border: 1px solid var(--bg4);
    background: var(--surface);
    color: var(--text2);
    cursor: pointer;
    font-size: .85rem;
    font-weight: 500;
    transition: .2s;
    font-family: 'Inter', sans-serif;
}

.preset-btn:hover, .preset-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.timer-controls { display: flex; gap: 12px; justify-content: center; margin-bottom: 40px; }

.timer-btn {
    padding: 10px 32px;
    border-radius: 12px;
    border: none;
    font-size: .92rem;
    font-weight: 600;
    cursor: pointer;
    transition: .2s;
    font-family: 'Inter', sans-serif;
}

.btn-start { background: var(--green); color: #fff; }
.btn-start:hover { opacity: .85; }
.btn-pause { background: var(--orange); color: #1a1a2e; }
.btn-pause:hover { opacity: .85; }
.btn-reset { background: var(--bg3); color: var(--text2); }
.btn-reset:hover { background: var(--bg4); }

/* --- Danger Zone --- */
.danger-zone {
    background: var(--surface);
    border: 1px solid rgba(244, 63, 94, 0.2);
    border-radius: 14px;
    padding: 24px;
    text-align: center;
    margin-top: 40px;
}

.danger-zone h3 { color: var(--red); font-size: .95rem; margin-bottom: 12px; }
.danger-zone p { font-size: .82rem; color: var(--text3); margin-bottom: 14px; }

.danger-btn {
    padding: 10px 28px;
    border-radius: 10px;
    border: 2px solid var(--red);
    background: transparent;
    color: var(--red);
    cursor: pointer;
    font-weight: 600;
    font-size: .85rem;
    transition: .2s;
    font-family: 'Inter', sans-serif;
}

.danger-btn:hover { background: var(--red); color: #fff; }

/* --- Module Border Colors --- */
.m1-border { border-top: 3px solid var(--m1); }
.m2-border { border-top: 3px solid var(--m2); }
.m3-border { border-top: 3px solid var(--m3); }
.m4-border { border-top: 3px solid var(--m4); }
.m5-border { border-top: 3px solid var(--m5); }

/* --- Variations Toggle --- */
.var-toggle-btn {
    background: none;
    border: none;
    color: var(--text3);
    cursor: pointer;
    font-size: .8rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 0;
    margin-top: 8px;
    transition: .2s;
    font-family: 'Inter', sans-serif;
}

.var-toggle-btn:hover { color: var(--accent2); }

.var-content {
    display: none;
    background: var(--bg2);
    border: 1px solid rgba(108, 99, 255, 0.1);
    border-radius: 8px;
    padding: 12px;
    margin-top: 8px;
    font-size: .82rem;
    color: var(--text2);
    line-height: 1.5;
}

.var-content.open { display: block; }

/* --- Responsive --- */
@media (max-width: 768px) {
    .hamburger { display: block; }

    .nav {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(10, 10, 18, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 12px;
        gap: 2px;
    }

    .nav.open { display: flex; }
    .nav a { padding: 12px 16px; font-size: .88rem; }

    .hero-title { font-size: 1.8rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .pattern-grid { grid-template-columns: 1fr; }
    .timer-display { font-size: 3.5rem; }
    .notes-grid, .pyq-grid, .rq-stats { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    .notes-grid, .pyq-grid { grid-template-columns: 1fr; }
}