/* Nightfall LMS — Stellar Brand Standards */
@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;600;700&family=Fira+Code:wght@400;500&display=swap');

:root {
    --brand-primary: #2915D6;
    --brand-secondary: #9100FA;
    --brand-accent: #50D8D7;
    --bg-primary: #0D090A;
    --bg-secondary: #141012;
    --bg-surface: #1C1618;
    --bg-card: #231E20;
    --text-primary: #F0F0F0;
    --text-secondary: #DFDFDF;
    --text-muted: #9A9A9A;
    --phase1: #06D6A0;
    --phase2: #FEC601;
    --phase3: #F18701;
    --phase4: #DF2935;
    --success: #06D6A0;
    --warning: #FEC601;
    --danger: #DF2935;
    --border: #2A2426;
    --font-body: 'Open Sans', 'Segoe UI', system-ui, sans-serif;
    --font-code: 'Fira Code', Consolas, monospace;
}

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

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    font-size: 15px;
    line-height: 1.5;
    position: relative;
    overflow-x: hidden;
}

a { color: var(--brand-primary); text-decoration: none; }
a:hover { color: var(--brand-secondary); }

/* ── Starfield Background ── */
.starfield { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.starfield .stars-1,
.starfield .stars-2,
.starfield .stars-3 {
    position: absolute;
    inset: 0;
    background-repeat: repeat;
    will-change: transform;
}
/* Layer 1: tiny distant stars */
.starfield .stars-1 {
    background-image:
        radial-gradient(1px 1px at 50px 80px, rgba(240,240,240,0.4), transparent),
        radial-gradient(1px 1px at 180px 40px, rgba(240,240,240,0.3), transparent),
        radial-gradient(1px 1px at 320px 120px, rgba(240,240,240,0.35), transparent),
        radial-gradient(1px 1px at 470px 200px, rgba(240,240,240,0.25), transparent),
        radial-gradient(1px 1px at 100px 300px, rgba(240,240,240,0.3), transparent),
        radial-gradient(1px 1px at 600px 160px, rgba(240,240,240,0.4), transparent),
        radial-gradient(1px 1px at 250px 380px, rgba(240,240,240,0.2), transparent),
        radial-gradient(1px 1px at 700px 60px, rgba(240,240,240,0.35), transparent),
        radial-gradient(1px 1px at 400px 320px, rgba(240,240,240,0.3), transparent),
        radial-gradient(1px 1px at 550px 400px, rgba(240,240,240,0.25), transparent);
    background-size: 800px 500px;
    animation: drift1 120s linear infinite;
}
/* Layer 2: medium stars */
.starfield .stars-2 {
    background-image:
        radial-gradient(1.5px 1.5px at 120px 150px, rgba(240,240,240,0.5), transparent),
        radial-gradient(1px 1px at 350px 90px, rgba(145,0,250,0.4), transparent),
        radial-gradient(1.5px 1.5px at 500px 280px, rgba(240,240,240,0.35), transparent),
        radial-gradient(1px 1px at 80px 350px, rgba(41,21,214,0.4), transparent),
        radial-gradient(1.5px 1.5px at 650px 180px, rgba(240,240,240,0.45), transparent),
        radial-gradient(1px 1px at 280px 420px, rgba(240,240,240,0.3), transparent),
        radial-gradient(1.5px 1.5px at 720px 350px, rgba(145,0,250,0.3), transparent);
    background-size: 900px 550px;
    animation: drift2 90s linear infinite;
}
/* Layer 3: a few brighter accent stars */
.starfield .stars-3 {
    background-image:
        radial-gradient(2px 2px at 200px 100px, rgba(80,216,215,0.5), transparent),
        radial-gradient(2px 2px at 600px 300px, rgba(145,0,250,0.5), transparent),
        radial-gradient(2px 2px at 400px 450px, rgba(41,21,214,0.5), transparent),
        radial-gradient(1.5px 1.5px at 750px 150px, rgba(80,216,215,0.4), transparent);
    background-size: 1000px 600px;
    animation: drift3 150s linear infinite;
}

@keyframes drift1 { from { transform: translateY(0); } to { transform: translateY(-500px); } }
@keyframes drift2 { from { transform: translateX(0); } to { transform: translateX(-900px); } }
@keyframes drift3 { from { transform: translate(0,0); } to { transform: translate(-400px, -300px); } }

/* Shooting stars */
.starfield .shooting-star {
    position: absolute;
    width: 100px;
    height: 1px;
    background: linear-gradient(90deg, rgba(240,240,240,0.6), transparent);
    border-radius: 1px;
    opacity: 0;
}
.starfield .shooting-star:nth-child(4) {
    top: 15%; left: 70%;
    transform: rotate(-35deg);
    animation: shoot 6s ease-in-out 2s infinite;
}
.starfield .shooting-star:nth-child(5) {
    top: 40%; left: 20%;
    width: 80px;
    transform: rotate(-30deg);
    animation: shoot 8s ease-in-out 5s infinite;
}
.starfield .shooting-star:nth-child(6) {
    top: 65%; left: 85%;
    width: 60px;
    transform: rotate(-40deg);
    animation: shoot 10s ease-in-out 8s infinite;
}

@keyframes shoot {
    0% { opacity: 0; transform: rotate(-35deg) translateX(0); }
    2% { opacity: 0.8; }
    6% { opacity: 0; transform: rotate(-35deg) translateX(-300px); }
    100% { opacity: 0; }
}

/* Ensure content sits above starfield */
.topbar, .container, footer { position: relative; z-index: 1; }

/* ── Topbar ── */
.topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(20, 16, 18, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: 0 28px;
    height: 56px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.topbar .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
}
.topbar .brand:hover { color: var(--text-primary); text-decoration: none; }
.topbar .brand img {
    width: 36px;
    height: 36px;
    max-width: 36px;
    max-height: 36px;
    object-fit: contain;
    display: block;
}
.topbar .brand-text {
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--text-primary);
}
.topbar .user { color: var(--text-muted); font-size: 14px; }
.topbar .user a { margin-left: 16px; color: var(--text-muted); }
.topbar .user a:hover { color: var(--brand-primary); }

/* ── Layout ── */
.container { max-width: 1100px; margin: 0 auto; padding: 28px 24px; }

/* ── Cards ── */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 24px;
    margin-bottom: 0;
}
.card h2 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    margin-bottom: 16px;
    font-weight: 600;
}
.card--compact { padding: 20px; }
.card--compact h2 { margin-bottom: 12px; }

/* ── Hero: Progress Card ── */
.hero-section { margin-bottom: 24px; }

.card--hero {
    position: relative;
    border: none;
    padding: 28px;
}
.card--hero::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 10px;
    padding: 1px;
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

/* ── Progress Track ── */
.progress-track {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}
.progress-phase {
    min-height: 88px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 12px 8px;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}
.phase-check { font-size: 20px; font-weight: 700; line-height: 1; margin-bottom: 2px; }
.phase-label { font-size: 14px; font-weight: 700; }
.phase-name { font-size: 11px; opacity: 0.6; margin-top: 2px; }
.phase-status { font-size: 11px; font-weight: 600; margin-top: 3px; }

.progress-phase.not_started { background: var(--bg-surface); color: var(--text-muted); border-color: var(--border); }
.progress-phase.in_progress { background: rgba(254, 198, 1, 0.1); color: var(--warning); border-color: var(--warning); }
.progress-phase.stuck { background: rgba(223, 41, 53, 0.1); color: var(--danger); border-color: var(--danger); }

.progress-phase.phase-1.completed { background: rgba(6, 214, 160, 0.1); color: var(--phase1); border-color: var(--phase1); }
.progress-phase.phase-2.completed { background: rgba(254, 198, 1, 0.1); color: var(--phase2); border-color: var(--phase2); }
.progress-phase.phase-3.completed { background: rgba(241, 135, 1, 0.1); color: var(--phase3); border-color: var(--phase3); }
.progress-phase.phase-4.completed { background: rgba(223, 41, 53, 0.1); color: var(--phase4); border-color: var(--phase4); }
.progress-phase.completed { background: rgba(6, 214, 160, 0.1); color: var(--success); border-color: var(--success); }

/* Glow animations */
@keyframes glow1 { 0%,100%{box-shadow:0 0 5px rgba(6,214,160,.3)} 50%{box-shadow:0 0 25px rgba(6,214,160,.8),0 0 50px rgba(6,214,160,.3)} }
@keyframes glow2 { 0%,100%{box-shadow:0 0 5px rgba(254,198,1,.3)} 50%{box-shadow:0 0 25px rgba(254,198,1,.8),0 0 50px rgba(254,198,1,.3)} }
@keyframes glow3 { 0%,100%{box-shadow:0 0 5px rgba(241,135,1,.3)} 50%{box-shadow:0 0 25px rgba(241,135,1,.8),0 0 50px rgba(241,135,1,.3)} }
@keyframes glow4 { 0%,100%{box-shadow:0 0 5px rgba(223,41,53,.3)} 50%{box-shadow:0 0 25px rgba(223,41,53,.8),0 0 50px rgba(223,41,53,.3)} }
.progress-phase.phase-1.just-captured { animation: glow1 .75s ease-in-out 4; }
.progress-phase.phase-2.just-captured { animation: glow2 .75s ease-in-out 4; }
.progress-phase.phase-3.just-captured { animation: glow3 .75s ease-in-out 4; }
.progress-phase.phase-4.just-captured { animation: glow4 .75s ease-in-out 4; }

/* ── Flag Input ── */
.flag-submit {
    display: flex;
    gap: 10px;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,0.06);
}
.flag-submit input {
    flex: 1;
    padding: 14px 18px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-code);
    font-size: 15px;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.flag-submit input:focus {
    outline: none;
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(41, 21, 214, 0.2);
}
.flag-submit input::placeholder {
    color: var(--text-muted);
    font-family: var(--font-code);
    letter-spacing: 0;
    text-transform: none;
    font-size: 14px;
}

/* ── Hints ── */
.hints-section { margin-bottom: 24px; }
.hint-card {
    background: rgba(41, 21, 214, 0.06);
    border: 1px solid rgba(41, 21, 214, 0.3);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 10px;
}
.hint-tier { font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: var(--brand-primary); font-weight: 700; }
.hint-title { font-weight: 600; margin-top: 4px; }
.hint-body { margin-top: 6px; color: var(--text-secondary); font-size: 14px; }

/* ── Utility Grid (two-column) ── */
.utility-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 20px;
}

/* ── Console Button (same style as submit flag) ── */
.console-btn {
    display: block;
    width: 100%;
    padding: 14px 24px;
    background: var(--brand-primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
}
.console-btn:hover {
    background: var(--brand-secondary);
    text-decoration: none;
    color: white;
}

/* ── Footer ── */
footer.site-footer {
    text-align: center;
    padding: 32px 24px 24px;
    color: var(--text-muted);
    font-size: 12px;
    opacity: 0.6;
}
footer.site-footer img {
    width: 16px;
    height: 16px;
    vertical-align: -2px;
    margin-right: 4px;
    opacity: 0.5;
}

/* ── Credential Grid ── */
.cred-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 3px 14px;
    font-size: 13px;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid rgba(255,255,255,0.06);
}
.cred-grid dt { color: var(--text-muted); font-weight: 600; }
.cred-grid dd { font-family: var(--font-code); color: var(--brand-accent); font-size: 13px; }

/* ── Content Grid ── */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 10px;
}
.content-link {
    display: block;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 16px;
    transition: all 0.2s;
    color: var(--text-primary);
}
.content-link:hover {
    border-color: var(--brand-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    text-decoration: none;
    color: var(--text-primary);
}
.content-title { font-weight: 600; font-size: 14px; margin-bottom: 3px; }
.content-meta { font-size: 12px; color: var(--text-muted); }

/* ── Buttons ── */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
}
.btn-primary { background: var(--brand-primary); color: white; }
.btn-primary:hover { background: var(--brand-secondary); text-decoration: none; color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--text-secondary); }
.btn-ghost:hover { border-color: var(--brand-primary); color: var(--brand-primary); text-decoration: none; }
.btn-sm { padding: 5px 14px; font-size: 12px; }
.btn-lg { padding: 14px 36px; font-size: 16px; }

/* ── Forms ── */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; color: var(--text-muted); margin-bottom: 5px; font-weight: 600; }
.form-group input, .form-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 15px;
}
.form-group input:focus { outline: none; border-color: var(--brand-primary); box-shadow: 0 0 0 3px rgba(41,21,214,0.15); }

/* ── Alerts ── */
.alert { padding: 14px 20px; border-radius: 8px; margin-bottom: 20px; font-size: 15px; }
.alert-success { background: rgba(6, 214, 160, 0.12); border: 1px solid var(--success); color: var(--success); }
.alert-error { background: rgba(223, 41, 53, 0.12); border: 1px solid var(--danger); color: var(--danger); }
.alert-warning { background: rgba(254, 198, 1, 0.12); border: 1px solid var(--warning); color: var(--warning); }
.alert-info { background: rgba(41, 21, 214, 0.12); border: 1px solid var(--brand-primary); color: var(--text-secondary); }

/* ── Login Page ── */
.login-container { max-width: 420px; margin: 80px auto; padding: 0 24px; }
.login-container .brand-logo { text-align: center; margin-bottom: 12px; }
.login-container .brand-logo img { height: 48px; width: auto; }
.login-container .brand-title {
    text-align: center;
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 4px;
    margin-bottom: 4px;
}
.login-container .subtitle { text-align: center; color: var(--text-muted); margin-bottom: 32px; font-size: 14px; }

/* ── Instructor Grid ── */
.grid-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.grid-table th { background: var(--bg-secondary); color: var(--text-muted); padding: 10px 14px; text-align: left; font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.grid-table td { padding: 8px 14px; border-bottom: 1px solid var(--border); }
.grid-table tr:hover { background: var(--bg-surface); }

.status-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; }
.status-dot.completed { background: var(--success); }
.status-dot.in_progress { background: var(--warning); }
.status-dot.not_started { background: var(--border); }
.status-dot.stuck { background: var(--danger); animation: pulse 1.5s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.4} }

/* ── Stats Row (Instructor) ── */
.stats-row { display: flex; gap: 16px; margin-bottom: 24px; }
.stat-card { flex: 1; background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; padding: 16px; text-align: center; }
.stat-card .value { font-size: 32px; font-weight: 700; }
.stat-card .label { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.stat-card.phase1 .value { color: var(--phase1); }
.stat-card.phase2 .value { color: var(--phase2); }
.stat-card.phase3 .value { color: var(--phase3); }
.stat-card.phase4 .value { color: var(--phase4); }

/* ── Responsive ── */
@media (max-width: 900px) {
    .utility-grid { grid-template-columns: 1fr; }
    .utility-grid .card { margin-bottom: 20px; }
}
@media (max-width: 640px) {
    .progress-track { grid-template-columns: repeat(2, 1fr); }
    .stats-row { flex-direction: column; }
    .container { padding: 16px; }
}