/* =========================================
   TASKS PAGE - Matching Design System
   ========================================= */

.tasks-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

.tasks-page::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(20, 184, 166, 0.1), transparent);
    pointer-events: none;
    z-index: 0;
}

.tasks-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 3rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    position: relative;
    z-index: 1;
}

.tasks-header {
    text-align: center;
    margin-bottom: 3rem;
}

.tasks-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin: 0 0 0.75rem;
    letter-spacing: -0.02em;
}

.tasks-title .highlight {
    background: linear-gradient(135deg, var(--primary-400), var(--accent-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tasks-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin: 0;
}

/* =========================================
   MODULE SECTIONS
   ========================================= */
.algorithm-section {
    margin-bottom: 4rem;
}

.module-section-head {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.module-section-copy {
    min-width: 0;
}

.algorithm-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.algorithm-title i {
    width: 24px;
    height: 24px;
    color: var(--primary-400);
}

.algorithm-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background: linear-gradient(180deg, var(--primary-500), var(--accent-500));
    border-radius: 2px;
}

.module-summary {
    margin: 0;
    color: var(--text-muted);
    line-height: 1.65;
    max-width: 760px;
}

.module-section-meta {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.course-module-card__status,
.module-progress-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.35rem 0.7rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
}

.module-progress-pill {
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.04);
}

.status-available {
    background: rgba(59, 130, 246, 0.15);
    color: #93c5fd;
    border: 1px solid rgba(59, 130, 246, 0.35);
}

.status-progress {
    background: rgba(245, 158, 11, 0.16);
    color: #fcd34d;
    border: 1px solid rgba(245, 158, 11, 0.35);
}

.status-completed {
    background: rgba(16, 185, 129, 0.15);
    color: #86efac;
    border: 1px solid rgba(16, 185, 129, 0.35);
}

.status-planned {
    background: rgba(168, 85, 247, 0.14);
    color: #d8b4fe;
    border: 1px solid rgba(168, 85, 247, 0.28);
}

.module-links-row,
.module-inline-links {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.module-links-row {
    margin-bottom: 1rem;
}

.module-note,
.module-inline-link {
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    font-size: 0.82rem;
    line-height: 1.4;
}

.module-note {
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
}

.module-links-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.module-links-block {
    padding: 1rem;
    border-radius: 10px;
    background: rgba(28, 25, 23, 0.62);
    border: 1px solid var(--border-subtle);
}

.module-links-title {
    margin: 0 0 0.75rem;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.module-inline-link {
    text-decoration: none;
    color: var(--primary-400);
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.2);
    transition: all 0.2s ease;
    gap: 0.45rem;
    max-width: 100%;
}

.module-inline-link:hover {
    transform: translateY(-1px);
    background: rgba(99, 102, 241, 0.14);
    border-color: rgba(99, 102, 241, 0.35);
}

.module-inline-link--seen {
    background: rgba(59, 130, 246, 0.09);
    border-color: rgba(59, 130, 246, 0.26);
}

.module-inline-link--done {
    color: #86efac;
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.3);
}

/* =========================================
   TASKS GRID
   ========================================= */
.tasks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.task-card__type {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    font-size: 0.76rem;
    font-weight: 600;
    line-height: 1.2;
}

/* =========================================
   TASK CARDS
   ========================================= */
.task-card {
    background: rgba(28, 25, 23, 0.62);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 1.65rem;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.task-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 12px;
    padding: 1px;
    background: linear-gradient(135deg, transparent, transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    transition: background 0.4s ease;
}

.task-card:hover::before {
    background: linear-gradient(135deg, var(--primary-500), var(--accent-500));
}

.task-card:hover {
    transform: translateY(-2px);
    background: rgba(28, 25, 23, 0.76);
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.28);
}

.task-card__top {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    align-items: flex-start;
}

.task-card__badges {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.45rem;
}

.task-card__concept {
    display: block;
    margin-top: 0.35rem;
    font-size: 0.78rem;
    line-height: 1.45;
    color: var(--text-muted);
}

.task-card__type {
    padding: 0.35rem 0.65rem;
}

.task-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    align-self: flex-start;
    padding: 0.35rem 0.85rem;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.difficulty-1 {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.difficulty-2 {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.difficulty-3 {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.task-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.75rem 0;
}

.task-card-desc {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
    flex-grow: 1;
}

.task-card-arrow {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1.25rem;
    color: var(--text-disabled);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.task-card:hover .task-card-arrow {
    color: var(--primary-400);
}

.task-card:hover .task-card-arrow i {
    transform: translateX(4px);
}

.task-card-arrow i {
    width: 16px;
    height: 16px;
    transition: transform 0.2s ease;
}

.task-card.completed {
    border-color: rgba(16, 185, 129, 0.38);
    background: linear-gradient(145deg, rgba(16, 185, 129, 0.12), rgba(28, 25, 23, 0.52));
}

.task-card.completed::after {
    content: '';
    position: absolute;
    inset: auto 1.25rem 1.25rem auto;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 999px;
    background: #22c55e;
    box-shadow: 0 0 16px rgba(34, 197, 94, 0.55);
}

.task-card.completed .task-card-arrow {
    color: #86efac;
}

.task-card--todo {
    border-color: rgba(99, 102, 241, 0.16);
}

/* =========================================
   EMPTY STATE
   ========================================= */
.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 4rem 2rem;
}

.empty-state-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 50%;
    color: var(--primary-400);
}

.empty-state-icon i {
    width: 32px;
    height: 32px;
}

.empty-state-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.empty-state-text {
    color: var(--text-muted);
}

.empty-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 2rem;
    color: var(--text-disabled);
    background: rgba(28, 25, 23, 0.3);
    border-radius: 12px;
    border: 1px dashed var(--border-subtle);
}

.empty-block i {
    width: 32px;
    height: 32px;
    opacity: 0.5;
}

.empty-block p {
    margin: 0;
    font-size: 0.9rem;
}

.tasks-footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-disabled);
    border-top: 1px solid var(--border-subtle);
    margin-top: auto;
    position: relative;
    z-index: 1;
}

.footer-text {
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .tasks-main {
        padding: 2rem 1.5rem 2rem;
    }

    .module-section-head {
        flex-direction: column;
    }

    .module-section-meta {
        justify-content: flex-start;
    }

    .module-links-grid {
        grid-template-columns: 1fr;
    }

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

    .task-card {
        padding: 1.5rem;
    }
}