/* ================================================================
   HUB MISSION CSS - Daily Mission Screen Redesign
   Transforms the hub from a static link list into a motivating
   daily study screen. Mobile-first, dark mode ready.
   ================================================================ */

/* ── CSS Custom Properties (extend existing :root) ── */
:root {
    --mission-gradient: linear-gradient(135deg, #4361ee, #7c3aed);
    --mission-bg: rgba(67, 97, 238, 0.04);
    --mission-border: rgba(67, 97, 238, 0.15);
    --streak-gold: #f59e0b;
    --streak-bg: rgba(245, 158, 11, 0.06);
    --phase-active: rgba(67, 97, 238, 0.08);
    --phase-border: rgba(67, 97, 238, 0.2);
    --chip-green: #10b981;
    --chip-orange: #f59e0b;
    --chip-red: #ef4444;
    --chip-gray: #94a3b8;
}
body.dark-mode {
    --mission-bg: rgba(99, 102, 241, 0.08);
    --mission-border: rgba(99, 102, 241, 0.25);
    --streak-bg: rgba(245, 158, 11, 0.1);
    --phase-active: rgba(99, 102, 241, 0.12);
    --phase-border: rgba(99, 102, 241, 0.3);
}

/* ================================================================
   1. DAILY MISSION CARD
   ================================================================ */
.daily-mission {
    background: var(--card, #fff);
    border: 2px solid var(--mission-border);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 24px;
    position: relative;
    overflow: hidden;
}
.daily-mission::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: var(--mission-gradient);
}
.daily-mission-ring {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    position: relative;
}
.daily-mission-ring svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}
.daily-mission-ring .ring-bg {
    fill: none;
    stroke: var(--border, #e5e7eb);
    stroke-width: 6;
}
.daily-mission-ring .ring-fill {
    fill: none;
    stroke: url(#mission-gradient);
    stroke-width: 6;
    stroke-linecap: round;
    stroke-dasharray: 226;
    stroke-dashoffset: 226;
    transition: stroke-dashoffset 0.8s ease;
}
.daily-mission-ring .ring-text {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--primary, #4361ee);
}
.daily-mission-content {
    flex: 1;
    min-width: 0;
}
.daily-mission-days {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--primary, #4361ee);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.daily-mission-days .edit-date-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-light, #6c757d);
    padding: 2px;
}
.daily-mission-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text, #1a1a2e);
    margin-bottom: 4px;
    line-height: 1.3;
}
.daily-mission-sub {
    font-size: 0.85rem;
    color: var(--text-light, #6c757d);
    line-height: 1.4;
}
.daily-mission-progress {
    margin-top: 10px;
    display: flex;
    gap: 6px;
}
.daily-mission-dot {
    width: 28px;
    height: 6px;
    border-radius: 3px;
    background: var(--border, #e5e7eb);
    transition: background 0.3s;
}
.daily-mission-dot.done {
    background: var(--mission-gradient);
}

/* ================================================================
   2. WARM WELCOME (signed-out hero)
   ================================================================ */
.warm-welcome {
    text-align: center;
    padding: 48px 24px 40px;
    margin-bottom: 24px;
}
.warm-welcome-title {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text, #1a1a2e);
    margin-bottom: 8px;
    line-height: 1.2;
}
.warm-welcome-sub {
    font-size: 0.95rem;
    color: var(--text-light, #6c757d);
    margin-bottom: 24px;
    max-width: 440px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
}
.warm-welcome-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--mission-gradient);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
}
.warm-welcome-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(67, 97, 238, 0.3);
}
.warm-welcome-stats {
    margin-top: 24px;
    display: flex;
    justify-content: center;
    gap: 24px;
    font-size: 0.82rem;
    color: var(--text-light, #6c757d);
}
.warm-welcome-stats span {
    font-weight: 700;
    color: var(--text, #1a1a2e);
}

/* ================================================================
   3. STREAK HERO
   ================================================================ */
.streak-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}
.streak-hero-card {
    background: var(--card, #fff);
    border-radius: 14px;
    padding: 18px 20px;
    border: 1px solid var(--border, rgba(0,0,0,0.08));
}
.streak-hero-card.streak {
    background: var(--streak-bg);
    border-color: rgba(245, 158, 11, 0.2);
}
.streak-hero-label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-light, #6c757d);
    margin-bottom: 6px;
}
.streak-hero-val {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text, #1a1a2e);
    display: flex;
    align-items: center;
    gap: 8px;
}
.streak-hero-val .flame {
    font-size: 1.3rem;
}
.streak-weekly {
    display: flex;
    gap: 5px;
    margin-top: 8px;
}
.streak-day {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    background: var(--border, #e5e7eb);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6rem;
    font-weight: 700;
    color: var(--text-light, #94a3b8);
}
.streak-day.active {
    background: var(--streak-gold);
    color: #fff;
}
.streak-day.today {
    border: 2px solid var(--streak-gold);
}
/* XP bar inside streak hero */
.streak-xp-bar {
    height: 6px;
    background: var(--border, #e5e7eb);
    border-radius: 3px;
    margin-top: 8px;
    overflow: hidden;
}
.streak-xp-fill {
    height: 100%;
    background: var(--primary, #4361ee);
    border-radius: 3px;
    transition: width 0.6s ease;
}
.streak-xp-text {
    font-size: 0.72rem;
    color: var(--text-light);
    margin-top: 4px;
}

/* ================================================================
   4. SUBJECT CARD ENHANCEMENTS
   ================================================================ */
.subject-status-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.68rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 6px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
.subject-status-chip.on-track {
    background: rgba(16, 185, 129, 0.1);
    color: var(--chip-green);
}
.subject-status-chip.needs-attention {
    background: rgba(245, 158, 11, 0.1);
    color: var(--chip-orange);
}
.subject-status-chip.not-started {
    background: rgba(148, 163, 184, 0.1);
    color: var(--chip-gray);
}
.subject-status-chip.strong {
    background: rgba(67, 97, 238, 0.1);
    color: var(--primary, #4361ee);
}
.subject-status-chip::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
}
.subject-micro-bar {
    height: 3px;
    background: var(--border, #e5e7eb);
    border-radius: 2px;
    margin-top: 6px;
    overflow: hidden;
}
.subject-micro-fill {
    height: 100%;
    border-radius: 2px;
    background: var(--primary, #4361ee);
    transition: width 0.5s ease;
    width: 0%;
}
.subject-weakest {
    font-size: 0.7rem;
    color: var(--text-light, #6c757d);
    margin-top: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.subject-cta {
    font-size: 0.75rem;
    font-weight: 700;
    color: rgba(255,255,255,0.5) !important;
    margin-top: 4px;
}

/* ================================================================
   5. STUDY PHASE GUIDE
   ================================================================ */
.study-phase-guide {
    margin-bottom: 24px;
}
.study-phase-guide-title {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-light, #6c757d);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 12px;
}
.study-phases {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}
.study-phase {
    background: var(--card, #fff);
    border: 1px solid var(--border, rgba(0,0,0,0.08));
    border-radius: 12px;
    padding: 16px;
    transition: border-color 0.2s, background 0.2s;
}
.study-phase.current {
    border-color: var(--phase-border);
    background: var(--phase-active);
}
.study-phase-num {
    font-size: 0.68rem;
    font-weight: 800;
    color: var(--text-light, #94a3b8);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 4px;
}
.study-phase.current .study-phase-num {
    color: var(--primary, #4361ee);
}
.study-phase-name {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--text, #1a1a2e);
    margin-bottom: 8px;
}
.study-phase-links {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.study-phase-link {
    font-size: 0.8rem;
    color: var(--primary, #4361ee);
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
}
.study-phase-link:hover {
    text-decoration: underline;
}
.study-phase-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
    background: var(--primary, #4361ee);
    color: #fff;
    margin-left: 4px;
}

/* ================================================================
   6. LIVE STATS FOOTER
   ================================================================ */
.live-stats-strip {
    display: flex;
    justify-content: center;
    gap: 20px;
    padding: 16px 0;
    font-size: 0.8rem;
    color: var(--text-light, #6c757d);
    flex-wrap: wrap;
}
.live-stats-strip .stat-item {
    display: flex;
    align-items: center;
    gap: 4px;
}
.live-stats-strip .stat-val {
    font-weight: 700;
    color: var(--text, #1a1a2e);
}
.live-stats-strip .stat-divider {
    color: var(--border, #e5e7eb);
}

/* ================================================================
   7. ENTRANCE ANIMATIONS
   ================================================================ */
@media (prefers-reduced-motion: no-preference) {
    .hub-entrance {
        opacity: 0;
        transform: translateY(16px);
        animation: hubEnter 0.4s ease forwards;
    }
    .hub-entrance:nth-child(1) { animation-delay: 0s; }
    .hub-entrance:nth-child(2) { animation-delay: 0.06s; }
    .hub-entrance:nth-child(3) { animation-delay: 0.12s; }
    .hub-entrance:nth-child(4) { animation-delay: 0.18s; }
    .hub-entrance:nth-child(5) { animation-delay: 0.24s; }

    @keyframes hubEnter {
        to { opacity: 1; transform: translateY(0); }
    }
}

/* ================================================================
   8. RESPONSIVE
   ================================================================ */
@media (max-width: 600px) {
    .daily-mission {
        flex-direction: column;
        text-align: center;
        padding: 20px 16px;
        gap: 16px;
    }
    .daily-mission-ring {
        width: 64px;
        height: 64px;
    }
    .daily-mission-progress {
        justify-content: center;
    }
    .streak-hero {
        grid-template-columns: 1fr;
    }
    .study-phases {
        grid-template-columns: 1fr;
    }
    .daily-mission-title {
        font-size: 1.05rem;
    }
    .warm-welcome-title {
        font-size: 1.3rem;
    }
    .warm-welcome-stats {
        flex-direction: column;
        gap: 8px;
    }
    .live-stats-strip {
        flex-direction: column;
        align-items: center;
        gap: 8px;
    }
    .live-stats-strip .stat-divider {
        display: none;
    }
}

/* ================================================================
   9. DARK MODE OVERRIDES
   ================================================================ */
body.dark-mode .daily-mission {
    background: var(--card, #1e1e2e);
}
body.dark-mode .streak-hero-card {
    background: var(--card, #1e1e2e);
    border-color: var(--border, rgba(255,255,255,0.08));
}
body.dark-mode .streak-hero-card.streak {
    background: var(--streak-bg);
    border-color: rgba(245, 158, 11, 0.2);
}
body.dark-mode .study-phase {
    background: var(--card, #1e1e2e);
    border-color: var(--border, rgba(255,255,255,0.08));
}
body.dark-mode .warm-welcome-cta {
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}
body.dark-mode .streak-day {
    background: rgba(255,255,255,0.06);
    color: var(--text-light);
}
body.dark-mode .streak-day.active {
    background: var(--streak-gold);
    color: #fff;
}
body.dark-mode .subject-micro-bar {
    background: rgba(255,255,255,0.08);
}