/* ============================
   RESET & BASE
   ============================ */

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
        Roboto, "Helvetica Neue", Arial, sans-serif;
    color: #111827;
    background-color: #f3f4f6;
    line-height: 1.5;
}

/* ============================
   LAYOUT CHUNG
   ============================ */

.app-body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: stretch;
}

.app-container {
    width: 100%;
    max-width: 960px;
    padding: 1.25rem;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ============================
   HEADER
   ============================ */

.app-header {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-wrap {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    border-radius: 9999px;
    overflow: hidden;
    background: #e5e7eb;
    display: flex;
    justify-content: center;
    align-items: center;
}

.logo-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.header-text {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.app-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: #111827;
}

.app-subtitle {
    font-size: 0.95rem;
    color: #4b5563;
}

/* ============================
   MAIN & CARD
   ============================ */

.app-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.card {
    background-color: #ffffff;
    border-radius: 0.75rem;
    padding: 1.25rem 1.25rem 1.5rem;
    box-shadow:
        0 10px 15px -3px rgba(15, 23, 42, 0.08),
        0 4px 6px -4px rgba(15, 23, 42, 0.08);
    border: 1px solid #e5e7eb;
}

.card-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: #111827;
}

.card-desc {
    font-size: 0.95rem;
    color: #4b5563;
    margin-bottom: 0.8rem;
}

/* Card phụ / hướng dẫn */

.card-help {
    border-style: dashed;
}

/* ============================
   ALERT
   ============================ */

.alert {
    border-radius: 0.5rem;
    padding: 0.7rem 0.9rem;
    font-size: 0.9rem;
    margin-bottom: 0.85rem;
}

.alert-error {
    background-color: #fef2f2;
    color: #b91c1c;
    border: 1px solid #fecaca;
}

/* ============================
   FORM & INPUT
   ============================ */

.code-form {
    margin-top: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.form-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: #374151;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    border-radius: 0.5rem;
    border: 1px solid #d1d5db;
    padding: 0.55rem 0.7rem;
    font-size: 0.95rem;
    color: #111827;
    background-color: #ffffff;
    transition: border-color 0.15s ease, box-shadow 0.15s ease,
        background-color 0.15s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.25);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: #9ca3af;
}

.form-textarea {
    min-height: 160px;
    resize: vertical;
}

/* Form hành động */

.form-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-top: 0.75rem;
}

/* ============================
   BUTTON
   ============================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.5rem 0.9rem;
    border-radius: 9999px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition:
        background-color 0.15s ease,
        color 0.15s ease,
        border-color 0.15s ease,
        transform 0.05s ease,
        box-shadow 0.15s ease;
    white-space: nowrap;
}

.btn:active {
    transform: translateY(1px);
}

/* Chủ đạo: xanh dương */

.btn-primary {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #ffffff;
    box-shadow:
        0 10px 15px -3px rgba(37, 99, 235, 0.35),
        0 4px 6px -4px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #1d4ed8, #1e40af);
}

/* Phụ: xám nhẹ */

.btn-secondary {
    background-color: #e5e7eb;
    color: #111827;
    border-color: #d1d5db;
}

.btn-secondary:hover {
    background-color: #d1d5db;
}

/* Viền */

.btn-outline {
    background-color: transparent;
    color: #2563eb;
    border-color: #2563eb;
}

.btn-outline:hover {
    background-color: rgba(37, 99, 235, 0.05);
}

/* ============================
   DANH SÁCH HƯỚNG DẪN
   ============================ */

.help-list {
    padding-left: 1.1rem;
    font-size: 0.95rem;
    color: #4b5563;
}

.help-list li {
    margin-bottom: 0.25rem;
}

/* ============================
   FOOTER
   ============================ */

.app-footer {
    text-align: center;
    font-size: 0.8rem;
    color: #6b7280;
    margin-top: 0.5rem;
}

/* ============================
   QR SCAN
   ============================ */

.qr-video-wrapper {
    position: relative;
    margin-top: 0.75rem;
    border-radius: 0.75rem;
    overflow: hidden;
    background-color: #000;
    border: 1px solid #111827;
}

.qr-video {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

.qr-canvas {
    display: none;
}

/* Khung overlay vuông ở giữa */

.qr-overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.qr-overlay::before {
    content: "";
    position: absolute;
    inset: 15%;
    border-radius: 0.75rem;
    border: 2px solid rgba(34, 197, 94, 0.9);
    box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.35);
}

/* Dòng scan ở giữa khung */

.qr-overlay::after {
    content: "";
    position: absolute;
    left: 15%;
    right: 15%;
    top: 50%;
    height: 2px;
    transform: translateY(-50%);
    background: linear-gradient(
        to right,
        transparent,
        rgba(34, 197, 94, 1),
        transparent
    );
    animation: qr-scan 1.5s ease-in-out infinite;
}

@keyframes qr-scan {
    0% {
        top: 20%;
    }
    50% {
        top: 80%;
    }
    100% {
        top: 20%;
    }
}

.scan-status {
    margin-top: 0.6rem;
    font-size: 0.9rem;
    color: #374151;
}

/* ============================
   THUYẾT MINH
   ============================ */

.code-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.15rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    background-color: #e0f2fe;
    color: #0369a1;
    margin-bottom: 0.5rem;
}

.content-text {
    font-size: 0.98rem;
    color: #111827;
    margin-top: 0.25rem;
}

.content-text br {
    margin-bottom: 0.25rem;
}

/* audio */

.audio-section {
    margin-top: 1rem;
}

.section-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
    color: #111827;
}

.audio-player-wrap {
    margin-top: 0.4rem;
}

.audio-player-wrap audio {
    width: 100%;
    max-width: 100%;
}

.audio-note {
    font-size: 0.85rem;
    color: #6b7280;
    margin-top: 0.35rem;
}

/* TTS Web Speech */

.tts-controls {
    margin-top: 0.4rem;
}

#tts-status {
    margin-top: 0.4rem;
    font-size: 0.85rem;
    color: #4b5563;
}

/* Divider */

.divider {
    border: none;
    border-top: 1px solid #e5e7eb;
    margin: 0.9rem 0;
}

/* ============================
   ADMIN LAYOUT CƠ BẢN
   (Dùng cho các file admin)
   ============================ */

.admin-body {
    min-height: 100vh;
    background-color: #0b1120;
    color: #e5e7eb;
}

.admin-container {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.admin-title {
    font-size: 1.4rem;
    font-weight: 700;
}

.admin-nav {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.admin-nav a {
    text-decoration: none;
}

.admin-main {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.admin-card {
    background: radial-gradient(circle at top left, #0f172a, #020617);
    border-radius: 0.9rem;
    border: 1px solid rgba(148, 163, 184, 0.3);
    padding: 1.1rem 1.25rem 1.3rem;
    box-shadow:
        0 18px 40px rgba(15, 23, 42, 0.75),
        0 0 0 1px rgba(15, 23, 42, 1);
}

.admin-card-title {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

/* ============================
   BẢNG (LIST ADMIN)
   ============================ */

.table-wrapper {
    width: 100%;
    overflow-x: auto;
    margin-top: 0.5rem;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    color: #e5e7eb;
}

.table thead {
    background: rgba(15, 23, 42, 0.85);
}

.table th,
.table td {
    padding: 0.55rem 0.6rem;
    border-bottom: 1px solid rgba(55, 65, 81, 0.7);
    text-align: left;
    vertical-align: top;
}

.table th {
    font-weight: 600;
    white-space: nowrap;
}

.table tbody tr:hover {
    background-color: rgba(15, 23, 42, 0.7);
}

/* Badge trạng thái */

.badge {
    display: inline-flex;
    align-items: center;
    border-radius: 9999px;
    padding: 0.1rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-green {
    background-color: rgba(22, 163, 74, 0.15);
    color: #4ade80;
}

.badge-gray {
    background-color: rgba(107, 114, 128, 0.25);
    color: #e5e7eb;
}

/* ============================
   FORM ADMIN (DÙNG LẠI CLASS FORM CHUNG)
   ============================ */

.admin-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.admin-form .form-label {
    color: #e5e7eb;
}

.admin-form .form-input,
.admin-form .form-select,
.admin-form .form-textarea {
    background-color: #020617;
    color: #e5e7eb;
    border-color: #475569;
}

.admin-form .form-input:focus,
.admin-form .form-select:focus,
.admin-form .form-textarea:focus {
    border-color: #38bdf8;
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.35);
}

/* ============================
   RESPONSIVE
   ============================ */

@media (max-width: 640px) {
    .app-header {
        flex-direction: row;
        align-items: center;
    }

    .app-title {
        font-size: 1.2rem;
    }

    .form-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .admin-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .admin-nav {
        width: 100%;
    }

    .admin-nav .btn {
        flex: 1 1 auto;
    }
}

.tm-content-text img {
    max-width: 100% !important;
    height: auto !important;
    border-radius: 8px;
    margin: 10px 0;
}