/* assets/css/main.css */

@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Barlow:wght@300;400;500;600;700&display=swap');

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

:root {
    --bg:         #0a0c0f;
    --bg2:        #111318;
    --bg3:        #181b22;
    --border:     #252830;
    --border2:    #2e3340;
    --text:       #e8eaf0;
    --text2:      #9aa0b4;
    --text3:      #5a6075;
    --accent:     #4f8ef7;
    --accent2:    #2d5fc4;
    --green:      #3ecf8e;
    --red:        #f75f5f;
    --yellow:     #f7c948;
    --purple:     #a78bfa;
    --mono:       'Space Mono', monospace;
    --sans:       'Barlow', sans-serif;
    --radius:     6px;
    --radius2:    10px;
    --shadow:     0 4px 24px rgba(0,0,0,0.5);
    --shadow2:    0 2px 8px rgba(0,0,0,0.3);
}

html { font-size: 16px; -webkit-font-smoothing: antialiased; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-weight: 400;
    line-height: 1.6;
    min-height: 100vh;
}

/* ── Layout ─────────────────────────────────────────────── */
.page-center {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius2);
    padding: 2rem;
    box-shadow: var(--shadow);
}

/* ── Topbar ─────────────────────────────────────────────── */
.topbar {
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
    padding: .85rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.topbar-brand {
    font-family: var(--mono);
    font-size: .85rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: .05em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: .5rem;
}

.topbar-brand svg { width: 18px; height: 18px; }

.topbar-right {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: .875rem;
    color: var(--text2);
}

.topbar-right a {
    color: var(--text2);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: .3rem;
    transition: color .2s;
}

.topbar-right a:hover { color: var(--text); }

/* ── Auth card ──────────────────────────────────────────── */
.auth-wrap {
    width: 100%;
    max-width: 420px;
}

.auth-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-logo h1 {
    font-family: var(--mono);
    font-size: 1.1rem;
    color: var(--accent);
    letter-spacing: .08em;
    text-transform: uppercase;
}

.auth-logo p {
    font-size: .8rem;
    color: var(--text3);
    margin-top: .25rem;
    font-family: var(--mono);
}

/* ── Forms ──────────────────────────────────────────────── */
.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    font-size: .8rem;
    font-weight: 600;
    color: var(--text2);
    letter-spacing: .04em;
    text-transform: uppercase;
    margin-bottom: .4rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="tel"],
input[type="number"],
textarea,
select {
    width: 100%;
    background: var(--bg3);
    border: 1px solid var(--border2);
    border-radius: var(--radius);
    color: var(--text);
    font-family: var(--sans);
    font-size: .95rem;
    padding: .65rem .9rem;
    outline: none;
    transition: border-color .2s, box-shadow .2s;
    -webkit-appearance: none;
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(79,142,247,.12);
}

input::placeholder,
textarea::placeholder { color: var(--text3); }

textarea { resize: vertical; min-height: 90px; }

select { cursor: pointer; }
select option { background: var(--bg3); }

.form-hint {
    font-size: .75rem;
    color: var(--text3);
    margin-top: .3rem;
}

.form-error {
    font-size: .78rem;
    color: var(--red);
    margin-top: .35rem;
    display: flex;
    align-items: center;
    gap: .25rem;
}

/* ── Buttons ────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .4rem;
    font-family: var(--sans);
    font-size: .88rem;
    font-weight: 600;
    padding: .65rem 1.25rem;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all .18s;
    letter-spacing: .02em;
    white-space: nowrap;
}

.btn svg { width: 15px; height: 15px; flex-shrink: 0; }

.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent2); border-color: var(--accent2); }

.btn-ghost {
    background: transparent;
    color: var(--text2);
    border-color: var(--border2);
}
.btn-ghost:hover { border-color: var(--text3); color: var(--text); }

.btn-danger {
    background: transparent;
    color: var(--red);
    border-color: rgba(247,95,95,.3);
}
.btn-danger:hover { background: rgba(247,95,95,.1); }

.btn-success {
    background: var(--green);
    color: #0a0c0f;
    border-color: var(--green);
}
.btn-success:hover { opacity: .88; }

.btn-sm { padding: .4rem .85rem; font-size: .82rem; }
.btn-block { width: 100%; }

/* ── Dashboard grid ─────────────────────────────────────── */
.dash-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 220px;
    flex-shrink: 0;
    background: var(--bg2);
    border-right: 1px solid var(--border);
    padding: 1.5rem 0;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-logo {
    padding: 0 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1rem;
}

.sidebar-logo h2 {
    font-family: var(--mono);
    font-size: .82rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: .06em;
}

.sidebar-logo p {
    font-size: .72rem;
    color: var(--text3);
    margin-top: .15rem;
}

.nav-section {
    padding: 0 .75rem;
    margin-bottom: .5rem;
}

.nav-label {
    font-size: .68rem;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--text3);
    padding: .5rem .5rem .25rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: .6rem;
    padding: .55rem .75rem;
    border-radius: var(--radius);
    font-size: .875rem;
    font-weight: 500;
    color: var(--text2);
    text-decoration: none;
    transition: all .15s;
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}

.nav-item svg { width: 16px; height: 16px; flex-shrink: 0; opacity: .7; }

.nav-item:hover { background: var(--bg3); color: var(--text); }
.nav-item.active { background: rgba(79,142,247,.12); color: var(--accent); }
.nav-item.active svg { opacity: 1; }

.sidebar-footer {
    margin-top: auto;
    padding: 1rem .75rem 0;
    border-top: 1px solid var(--border);
}

.main-content {
    flex: 1;
    overflow-x: hidden;
}

.page-header {
    padding: 1.75rem 2rem 0;
    margin-bottom: 1.75rem;
}

.page-header h1 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
}

.page-header p {
    font-size: .875rem;
    color: var(--text2);
    margin-top: .25rem;
}

.page-body {
    padding: 0 2rem 2rem;
}

/* ── Stats cards ─────────────────────────────────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius2);
    padding: 1.25rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: .5rem;
}

.stat-card-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: .25rem;
}

.stat-card-icon.blue  { background: rgba(79,142,247,.12); color: var(--accent); }
.stat-card-icon.green { background: rgba(62,207,142,.12); color: var(--green); }
.stat-card-icon.yellow{ background: rgba(247,201,72,.12);  color: var(--yellow); }
.stat-card-icon.purple{ background: rgba(167,139,250,.12); color: var(--purple); }
.stat-card-icon svg   { width: 18px; height: 18px; }

.stat-card-label {
    font-size: .75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--text3);
}

.stat-card-value {
    font-family: var(--mono);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1;
}

/* ── Table ──────────────────────────────────────────────── */
.table-wrap {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius2);
    overflow: hidden;
}

.table-header {
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
}

.table-title {
    font-size: .95rem;
    font-weight: 700;
    color: var(--text);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    padding: .75rem 1.5rem;
    text-align: left;
    font-size: .72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--text3);
    background: var(--bg3);
    border-bottom: 1px solid var(--border);
}

td {
    padding: .9rem 1.5rem;
    font-size: .875rem;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg3); }

/* ── Badges ─────────────────────────────────────────────── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: .25rem;
    padding: .2rem .55rem;
    border-radius: 4px;
    font-size: .72rem;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
}

.badge-green  { background: rgba(62,207,142,.1);  color: var(--green); }
.badge-red    { background: rgba(247,95,95,.1);   color: var(--red); }
.badge-yellow { background: rgba(247,201,72,.1);  color: var(--yellow); }
.badge-blue   { background: rgba(79,142,247,.1);  color: var(--accent); }

/* ── Alert ──────────────────────────────────────────────── */
.alert {
    padding: .85rem 1.1rem;
    border-radius: var(--radius);
    font-size: .875rem;
    display: flex;
    align-items: flex-start;
    gap: .65rem;
    margin-bottom: 1.25rem;
    border: 1px solid transparent;
}

.alert svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: .1rem; }
.alert-error   { background: rgba(247,95,95,.08);  border-color: rgba(247,95,95,.2);  color: var(--red); }
.alert-success { background: rgba(62,207,142,.08); border-color: rgba(62,207,142,.2); color: var(--green); }
.alert-info    { background: rgba(79,142,247,.08); border-color: rgba(79,142,247,.2); color: var(--accent); }

/* ── Toggle switch ──────────────────────────────────────── */
.toggle-wrap {
    display: flex;
    align-items: center;
    gap: .75rem;
}

.toggle {
    position: relative;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
}

.toggle input { opacity: 0; width: 0; height: 0; position: absolute; }

.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--bg3);
    border: 1px solid var(--border2);
    border-radius: 24px;
    cursor: pointer;
    transition: all .2s;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text3);
    top: 3px;
    left: 3px;
    transition: all .2s;
}

.toggle input:checked + .toggle-slider {
    background: rgba(62,207,142,.15);
    border-color: var(--green);
}

.toggle input:checked + .toggle-slider::before {
    background: var(--green);
    transform: translateX(20px);
}

/* ── Competition status bar ─────────────────────────────── */
.status-bar {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius2);
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: .65rem;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text3);
    flex-shrink: 0;
}

.status-dot.open {
    background: var(--green);
    box-shadow: 0 0 8px rgba(62,207,142,.5);
    animation: pulse 2s infinite;
}

.status-dot.closed { background: var(--red); }

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 6px rgba(62,207,142,.5); }
    50%       { box-shadow: 0 0 14px rgba(62,207,142,.8); }
}

/* ── Student competition view ───────────────────────────── */
.comp-wrap {
    max-width: 680px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.comp-header {
    margin-bottom: 2rem;
    text-align: center;
}

.team-badge {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    background: rgba(79,142,247,.08);
    border: 1px solid rgba(79,142,247,.2);
    border-radius: 24px;
    padding: .4rem 1rem;
    font-size: .82rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: .04em;
    margin-bottom: 1rem;
}

.team-badge svg { width: 14px; height: 14px; }

.comp-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: .25rem;
}

.progress-track {
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: var(--radius2);
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: .75rem;
}

.progress-bar-wrap {
    flex: 1;
    min-width: 150px;
}

.progress-label {
    font-size: .75rem;
    color: var(--text3);
    text-transform: uppercase;
    letter-spacing: .06em;
    font-weight: 600;
    margin-bottom: .35rem;
}

.progress-bar {
    height: 6px;
    background: var(--bg2);
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 6px;
    transition: width .4s ease;
}

.points-display {
    text-align: right;
}

.points-value {
    font-family: var(--mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--yellow);
    line-height: 1;
}

.points-label {
    font-size: .72rem;
    color: var(--text3);
    text-transform: uppercase;
    letter-spacing: .06em;
}

.question-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius2);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.question-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: .75rem 1.25rem;
    background: var(--bg3);
    border-bottom: 1px solid var(--border);
}

.question-num {
    font-family: var(--mono);
    font-size: .78rem;
    color: var(--text3);
}

.question-pts {
    font-family: var(--mono);
    font-size: .78rem;
    color: var(--yellow);
    font-weight: 700;
}

.question-body {
    padding: 1.5rem 1.25rem;
}

.question-text {
    font-size: 1.05rem;
    font-weight: 500;
    line-height: 1.65;
    color: var(--text);
    margin-bottom: 1.25rem;
}

.answer-input-wrap {
    display: flex;
    gap: .75rem;
    align-items: flex-start;
}

.answer-input-wrap input {
    flex: 1;
}

.answer-feedback {
    padding: .7rem 1rem;
    border-radius: var(--radius);
    font-size: .875rem;
    font-weight: 500;
    display: none;
    align-items: center;
    gap: .5rem;
    margin-top: .75rem;
    border: 1px solid transparent;
}

.answer-feedback.show { display: flex; }
.answer-feedback.wrong  { background: rgba(247,95,95,.08);  border-color: rgba(247,95,95,.2);  color: var(--red); }
.answer-feedback.correct{ background: rgba(62,207,142,.08); border-color: rgba(62,207,142,.2); color: var(--green); }

/* ── Modal ──────────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.7);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal-overlay.show { display: flex; }

.modal {
    background: var(--bg2);
    border: 1px solid var(--border2);
    border-radius: var(--radius2);
    padding: 2rem;
    width: 100%;
    max-width: 520px;
    box-shadow: var(--shadow);
    animation: modalIn .2s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(.95) translateY(-10px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.modal-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text3);
    cursor: pointer;
    padding: .25rem;
    border-radius: 4px;
    line-height: 0;
    transition: color .2s;
}

.modal-close:hover { color: var(--text); }
.modal-close svg { width: 18px; height: 18px; }

/* ── Chart ──────────────────────────────────────────────── */
.chart-container {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius2);
    padding: 1.5rem;
}

.chart-title {
    font-size: .95rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: .5rem;
}

.chart-title svg { width: 16px; height: 16px; color: var(--accent); }

.bar-chart {
    display: flex;
    flex-direction: column;
    gap: .75rem;
}

.bar-row {
    display: flex;
    align-items: center;
    gap: .75rem;
}

.bar-label {
    font-size: .82rem;
    font-weight: 600;
    color: var(--text2);
    width: 120px;
    flex-shrink: 0;
    text-align: right;
    font-family: var(--mono);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.bar-track {
    flex: 1;
    height: 28px;
    background: var(--bg3);
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid var(--border);
    position: relative;
}

.bar-fill {
    height: 100%;
    border-radius: 4px;
    display: flex;
    align-items: center;
    padding-right: .5rem;
    justify-content: flex-end;
    font-family: var(--mono);
    font-size: .72rem;
    font-weight: 700;
    color: #fff;
    min-width: 40px;
    transition: width .6s ease;
    background: var(--accent);
}

.bar-fill:nth-child(1) { background: var(--accent); }

/* ── Misc ───────────────────────────────────────────────── */
.divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 1.5rem 0;
}

.text-muted { color: var(--text2); }
.text-xs { font-size: .78rem; }

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.answers-list {
    display: flex;
    flex-direction: column;
    gap: .5rem;
    margin-top: .5rem;
}

.answer-tag {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    background: var(--bg3);
    border: 1px solid var(--border2);
    border-radius: var(--radius);
    padding: .3rem .65rem;
    font-size: .8rem;
    color: var(--text2);
    font-family: var(--mono);
}

.remove-answer {
    background: none;
    border: none;
    color: var(--text3);
    cursor: pointer;
    padding: 0;
    line-height: 0;
    transition: color .15s;
}

.remove-answer:hover { color: var(--red); }
.remove-answer svg { width: 13px; height: 13px; }

.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text3);
}

.empty-state svg {
    width: 40px;
    height: 40px;
    margin: 0 auto 1rem;
    opacity: .4;
}

.empty-state p { font-size: .875rem; }

/* ── Rank indicator ─────────────────────────────────────── */
.rank-1 { color: var(--yellow); font-weight: 700; font-family: var(--mono); }
.rank-2 { color: var(--text2); font-weight: 700; font-family: var(--mono); }
.rank-3 { color: #cd7f32; font-weight: 700; font-family: var(--mono); }

/* ── Completion screen ──────────────────────────────────── */
.completion-screen {
    text-align: center;
    padding: 3rem 1.5rem;
}

.completion-icon {
    width: 72px;
    height: 72px;
    background: rgba(62,207,142,.12);
    border: 2px solid rgba(62,207,142,.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--green);
}

.completion-icon svg { width: 36px; height: 36px; }

.completion-screen h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: .5rem;
}

.completion-screen p {
    color: var(--text2);
    font-size: .95rem;
    margin-bottom: 2rem;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
    .sidebar { display: none; }
    .page-body, .page-header { padding-left: 1rem; padding-right: 1rem; }
    .grid-2 { grid-template-columns: 1fr; }
    th, td { padding: .75rem 1rem; }
}

/* ── Scrollbar ──────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text3); }