/* ============================================================
   MINH DUONG MATH — Trang Tài Liệu (tai-lieu/index.html)
   ============================================================ */

/* ── Container ───────────────────────────────────────────────── */
.tl-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 16px;
}

/* ── Controls (search + filter) ──────────────────────────────── */
.tl-controls {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky;
    top: 54px;
    z-index: 50;
}

.tl-controls .tl-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Search */
.tl-search-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-pill);
    padding: 9px 16px;
    background: var(--cream);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.tl-search-wrap:focus-within {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(74, 143, 164, 0.12);
    background: var(--white);
}

.tl-search-wrap__icon {
    width: 16px;
    height: 16px;
    color: var(--text-gray);
    flex-shrink: 0;
}

.tl-search-wrap__input {
    border: none;
    outline: none;
    background: transparent;
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 0.875rem;
    color: var(--text-dark);
    width: 100%;
}

.tl-search-wrap__input::placeholder { color: var(--text-gray); opacity: 0.7; }

.tl-search-wrap__clear {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-gray);
    font-size: 14px;
    padding: 2px 4px;
    border-radius: 50%;
    transition: color var(--transition);
    flex-shrink: 0;
}
.tl-search-wrap__clear:hover { color: var(--text-dark); }

/* Filter buttons */
.tl-filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tl-filter-btn {
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-pill);
    padding: 6px 14px;
    background: var(--white);
    color: var(--text-gray);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.tl-filter-btn:hover {
    border-color: var(--primary-light);
    color: var(--primary-light);
}

.tl-filter-btn--active {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: var(--white);
}

/* ── Main / Grid ──────────────────────────────────────────────── */
.tl-main {
    padding: 32px 16px 64px;
}

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

/* ── Card ─────────────────────────────────────────────────────── */
.tl-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: box-shadow var(--transition), transform var(--transition);
    animation: cardIn 0.3s ease both;
}

@keyframes cardIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: none; }
}

.tl-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.tl-card__badge {
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    color: var(--white);
}

.tl-card__badge--de-thi-thu        { background: var(--primary-light); }
.tl-card__badge--de-thi-chinh-thuc { background: var(--primary-dark); }
.tl-card__badge--tai-lieu-on-thi   { background: var(--gold); }

.tl-card__title {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-dark);
    line-height: 1.3;
    margin: 0;
}

.tl-card__desc {
    font-size: 0.82rem;
    color: var(--text-gray);
    line-height: 1.6;
    margin: 0;
    flex: 1;
}

.tl-card__btn {
    align-self: flex-start;
    padding: 9px 20px;
    font-size: 0.68rem;
    margin-top: 4px;
}

/* ── Pagination ──────────────────────────────────────────────── */
.tl-pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 40px;
}

.tl-page-btn {
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 0.82rem;
    font-weight: 600;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--white);
    color: var(--text-gray);
    cursor: pointer;
    transition: all var(--transition);
}

.tl-page-btn:hover {
    border-color: var(--primary-light);
    color: var(--primary-light);
}

.tl-page-btn--active {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: var(--white);
}

/* ── Popup Overlay ───────────────────────────────────────────── */
.tl-overlay {
    position: fixed;
    inset: 0;
    z-index: 500;
    background: rgba(7, 17, 28, 0.72);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: overlayIn 0.2s ease;
}

.tl-overlay[hidden] { display: none; }

@keyframes overlayIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* ── Popup ───────────────────────────────────────────────────── */
.tl-popup {
    background: var(--white);
    border-radius: 8px;
    padding: 28px 24px 24px;
    max-width: 460px;
    width: 100%;
    max-height: 92vh;
    overflow-y: auto;
    box-shadow: 0 24px 64px rgba(7, 17, 28, 0.38);
    position: relative;
    animation: popupIn 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes popupIn {
    from { opacity: 0; transform: scale(0.94) translateY(12px); }
    to   { opacity: 1; transform: none; }
}

.tl-popup__close {
    position: absolute;
    top: 14px;
    right: 16px;
    background: none;
    border: none;
    font-size: 18px;
    color: var(--text-gray);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background var(--transition), color var(--transition);
}
.tl-popup__close:hover { background: var(--cream-warm); color: var(--text-dark); }

.tl-popup__header { text-align: center; margin-bottom: 20px; }

.tl-popup__icon {
    width: 44px;
    height: 44px;
    background: var(--primary-pale);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
    color: var(--primary-dark);
}
.tl-popup__icon svg { width: 22px; height: 22px; }

.tl-popup__title {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 6px;
}

.tl-popup__subtitle {
    font-size: 0.82rem;
    color: var(--text-gray);
    margin: 0;
}

/* ── Form Fields ──────────────────────────────────────────────── */
.tl-field {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-bottom: 14px;
}

.tl-field__label {
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-dark);
    letter-spacing: 0.02em;
}

.tl-field__label span { color: var(--primary-light); }

.tl-field__input,
.tl-field__select {
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 0.875rem;
    color: var(--text-dark);
    background: var(--white);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
    width: 100%;
}

.tl-field__input:focus,
.tl-field__select:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(74, 143, 164, 0.12);
}

.tl-field__input.is-invalid,
.tl-field__select.is-invalid { border-color: #c0392b; }

.tl-field__radio-group {
    display: flex;
    gap: 20px;
}

.tl-field__radio {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 0.875rem;
    color: var(--text-dark);
}

.tl-field__radio input[type="radio"] { accent-color: var(--primary-dark); width: 16px; height: 16px; }

/* Error */
.tl-popup__error {
    font-size: 0.8rem;
    color: #c0392b;
    background: #fdecea;
    border: 1px solid #f5c6cb;
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    margin-bottom: 12px;
}

/* Submit */
.tl-popup__submit {
    padding: 13px 32px;
    font-size: 0.75rem;
}

.tl-popup__submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* Success */
.tl-popup__success {
    text-align: center;
    padding: 24px 20px 16px;
}

.tl-popup__success-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
}
.tl-popup__success-icon svg { width: 100%; height: 100%; }

.tl-popup__success h4 {
    font-family: 'Cormorant Garamond', serif;
    font-size: 1.4rem;
    color: var(--primary-dark);
    margin-bottom: 6px;
}
.tl-popup__success p { font-size: 0.875rem; color: var(--text-gray); margin: 0; }

/* ══ RESPONSIVE ════════════════════════════════════════════════ */

@media (min-width: 480px) {
    .tl-controls {
        top: 57px;
    }

    .tl-controls .tl-container {
        flex-direction: row;
        align-items: center;
    }

    .tl-search-wrap { flex: 1; min-width: 0; }
}

@media (min-width: 640px) {
    .tl-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
    .tl-controls { top: 61px; padding: 20px 0; }

    .tl-popup { padding: 32px 28px 28px; }

    .tl-popup__title { font-size: 1.6rem; }
}

@media (min-width: 1024px) {
    .tl-grid { grid-template-columns: repeat(3, 1fr); }

    .tl-card__title { font-size: 1.1rem; }
}