/* ============================================
   ROOT VARIABLES
============================================ */
:root {
    --bg: #0b0b12;
    --bg-card: #13131e;
    --bg-elevated: #1a1a2a;
    --bg-hover: #22223a;
    --border: #28283a;
    --border-hover: #3a3a52;
    --text: #e8e8f0;
    --text-secondary: #8a8aaa;
    --text-muted: #5a5a72;
    --accent: #f5b400;
    --accent-dim: rgba(245, 180, 0, 0.12);
    --success: #4ade80;
    --danger: #f87171;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --transition: 0.25s ease;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 24px 16px;
}

.container {
    max-width: 820px;
    width: 100%;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 28px 24px 32px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

/* ============================================
   HEADER
============================================ */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 4px;
    flex-wrap: wrap;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    stroke: var(--accent);
}

.header h1 {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, #f5b400, #ff6b00);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header h1 span {
    background: linear-gradient(135deg, #f5b400, #ff6b00);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.version {
    font-size: 10px;
    color: var(--text-muted);
    background: var(--bg-elevated);
    padding: 2px 10px;
    border-radius: 20px;
    border: 1px solid var(--border);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.header-actions {
    display: flex;
    gap: 8px;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn-back:hover {
    background: var(--border);
    color: var(--text);
    border-color: var(--border-hover);
}

.btn-back i {
    width: 18px;
    height: 18px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 13px;
    margin-bottom: 22px;
    padding-left: 2px;
}

/* ============================================
   STATUS CARD
============================================ */
.card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 24px;
    margin-bottom: 16px;
}

.status-card .status-row {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.status-item {
    flex: 1;
    min-width: 120px;
}

.status-item .status-label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.status-item .status-value {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    word-break: break-all;
}

.status-item .status-value.accent {
    color: var(--accent);
}

.btn-sm {
    padding: 8px 12px;
    min-height: 36px;
    min-width: unset;
}

.btn-copy {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-copy:hover {
    background: var(--border);
    color: var(--text);
}

.btn-copy i {
    width: 18px;
    height: 18px;
}

/* ============================================
   BUTTONS
============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    min-height: 44px;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, #f5b400, #d49a00);
    color: #0b0b12;
}

.btn-primary:hover:not(:disabled) {
    background: #ffcc00;
    transform: scale(1.01);
    box-shadow: 0 4px 20px rgba(245, 180, 0, 0.25);
}

.btn-secondary {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background: var(--border);
    color: var(--text);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.25);
    color: var(--danger);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.25);
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none !important;
}

.btn-icon {
    width: 18px;
    height: 18px;
    stroke: currentColor;
}

.actions-top {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.actions-top .btn {
    flex: 1;
    min-width: 120px;
}

/* ============================================
   LOADING & ERROR
============================================ */
.loading {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 14px;
    padding: 30px 0;
    color: var(--text-secondary);
}

.loading.show {
    display: flex;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top: 3px solid var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.error {
    display: none;
    padding: 14px 18px;
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm);
    color: #f87171;
    font-size: 14px;
    margin-top: 12px;
}

.error.show {
    display: block;
}

/* ============================================
   INBOX
============================================ */
.inbox-container {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-top: 4px;
}

.inbox-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
}

.inbox-header h3 {
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
}

.inbox-header h3 i {
    width: 18px;
    height: 18px;
    stroke: var(--accent);
}

.total-badge {
    font-size: 12px;
    color: var(--text-muted);
    background: var(--bg);
    padding: 2px 12px;
    border-radius: 20px;
    border: 1px solid var(--border);
}

.inbox-list {
    max-height: 400px;
    overflow-y: auto;
}

.inbox-list::-webkit-scrollbar {
    width: 4px;
}
.inbox-list::-webkit-scrollbar-track {
    background: var(--bg);
}
.inbox-list::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.empty-inbox {
    text-align: center;
    padding: 50px 20px;
    color: var(--text-muted);
}

.empty-inbox i {
    width: 48px;
    height: 48px;
    stroke: var(--text-muted);
    opacity: 0.3;
    margin-bottom: 12px;
}

/* ============================================
   MESSAGE ITEM
============================================ */
.message-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: all var(--transition);
}

.message-item:hover {
    background: var(--bg-hover);
}

.message-item:last-child {
    border-bottom: none;
}

.message-item .msg-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent-dim);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.message-item .msg-icon i {
    width: 18px;
    height: 18px;
    stroke: var(--accent);
}

.message-item .msg-content {
    flex: 1;
    min-width: 0;
}

.message-item .msg-from {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
}

.message-item .msg-subject {
    font-size: 13px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.message-item .msg-time {
    font-size: 11px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.message-item .msg-badge {
    font-size: 9px;
    font-weight: 700;
    text-transform: uppercase;
    padding: 2px 8px;
    border-radius: 20px;
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid rgba(245, 180, 0, 0.15);
}

/* ============================================
   MESSAGE DETAIL
============================================ */
.message-detail {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-top: 16px;
    overflow: hidden;
}

.detail-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: flex-start;
    gap: 12px;
    flex-wrap: wrap;
}

.detail-header .btn-close-detail {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    transition: all var(--transition);
}

.detail-header .btn-close-detail:hover {
    color: var(--text);
}

.detail-header .btn-close-detail i {
    width: 20px;
    height: 20px;
}

.detail-header h4 {
    flex: 1;
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
}

.detail-header #detailFrom {
    font-size: 13px;
    color: var(--text-secondary);
}

.detail-body {
    padding: 20px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-word;
}

.detail-body p {
    margin: 0;
}

/* ============================================
   FOOTER
============================================ */
.page-footer {
    border-top: 1px solid var(--border);
    padding: 20px 0 0 0;
    margin-top: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 12px;
}

.page-footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

/* ============================================
   RESPONSIVE
============================================ */
@media (max-width: 600px) {
    .container {
        padding: 16px 12px;
    }

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

    .header-actions {
        width: 100%;
    }

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

    .status-card .status-row {
        flex-direction: column;
        align-items: stretch;
    }

    .actions-top {
        flex-direction: column;
    }

    .actions-top .btn {
        width: 100%;
        min-width: unset;
    }

    .inbox-header {
        flex-direction: column;
        gap: 6px;
        align-items: flex-start;
    }

    .message-item {
        flex-wrap: wrap;
        gap: 8px;
    }

    .message-item .msg-time {
        margin-left: auto;
    }
}