/* ==========================================================================
   Device Authentication Portal - Core Design System & Theming
   Supports: Light Mode, Dark Mode, and System Default (prefers-color-scheme)
   ========================================================================== */

:root {
    /* Base Brand Accents */
    --primary: #4361ee;
    --primary-hover: #3751d8;
    --primary-light: #eef2ff;
    --primary-glow: rgba(67, 97, 238, 0.25);
    --success: #10b981;
    --success-bg: #ecfdf5;
    --success-border: #a7f3d0;
    --success-text: #065f46;
    --danger: #ef4444;
    --danger-bg: #fef2f2;
    --danger-border: #fecaca;
    --danger-text: #991b1b;
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --warning-border: #fde68a;
    --warning-text: #92400e;
    --info: #3b82f6;
    --info-bg: #eff6ff;
    --info-border: #bfdbfe;
    --info-text: #1e40af;

    /* Light Theme Palette */
    --bg-page: linear-gradient(135deg, #f0f4fd 0%, #e2e8f0 100%);
    --surface-card: #ffffff;
    --surface-card-border: #e2e8f0;
    --surface-header: linear-gradient(135deg, #0b2559 0%, #061533 100%);
    --surface-header-text: #ffffff;
    --surface-header-sub: #93c5fd;

    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;

    --input-bg: #ffffff;
    --input-border: #cbd5e1;
    --input-text: #0f172a;
    --input-placeholder: #94a3b8;
    --input-focus-border: var(--primary);
    --input-focus-glow: rgba(67, 97, 238, 0.15);

    --badge-box-bg: #f8fafc;
    --badge-box-border: #e2e8f0;
    --badge-bg: #ffffff;
    --badge-border: #cbd5e1;
    --badge-text: #334155;

    --topbar-bg: linear-gradient(135deg, #0b2559 0%, #061533 100%);
    --topbar-border: rgba(255, 255, 255, 0.1);
    --topbar-text: #ffffff;
    --topbar-user-bg: rgba(255, 255, 255, 0.15);

    --modal-overlay: rgba(15, 23, 42, 0.7);
    --modal-bg: #ffffff;
    --modal-border: #cbd5e1;
    --modal-header-bg: #1e293b;
    --table-th-bg: #f1f5f9;
    --table-th-text: #475569;
    --table-td-border: #e2e8f0;
    --table-hover-bg: #f8fafc;
    --code-bg: #f1f5f9;
    --code-text: #0f172a;

    --toggle-container-bg: rgba(255, 255, 255, 0.85);
    --toggle-container-border: #cbd5e1;
    --toggle-active-bg: #ffffff;
    --toggle-active-text: var(--primary);
    --toggle-active-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
    --toggle-inactive-text: #64748b;

    --radius: 12px;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.08);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   Dark Theme Overrides (Explicit [data-theme="dark"] or System Auto)
   ========================================================================== */

[data-theme="dark"] {
    --bg-page: radial-gradient(circle at 50% 0%, #172445 0%, #0c1220 50%, #060911 100%);
    --surface-card: #111a2e;
    --surface-card-border: rgba(255, 255, 255, 0.08);
    --surface-header: linear-gradient(135deg, #0b1c3d 0%, #071022 100%);
    --surface-header-text: #f8fafc;
    --surface-header-sub: #60a5fa;

    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;

    --input-bg: #0c1322;
    --input-border: #24344d;
    --input-text: #f8fafc;
    --input-placeholder: #64748b;
    --input-focus-border: #6366f1;
    --input-focus-glow: rgba(99, 102, 241, 0.3);

    --badge-box-bg: #0c1322;
    --badge-box-border: #1e293b;
    --badge-bg: #162238;
    --badge-border: #2c3e5e;
    --badge-text: #e2e8f0;

    --success-bg: rgba(16, 185, 129, 0.14);
    --success-border: rgba(16, 185, 129, 0.3);
    --success-text: #6ee7b7;
    --danger-bg: rgba(239, 68, 68, 0.14);
    --danger-border: rgba(239, 68, 68, 0.3);
    --danger-text: #fca5a5;
    --warning-bg: rgba(245, 158, 11, 0.14);
    --warning-border: rgba(245, 158, 11, 0.3);
    --warning-text: #fcd34d;
    --info-bg: rgba(59, 130, 246, 0.14);
    --info-border: rgba(59, 130, 246, 0.3);
    --info-text: #93c5fd;

    --topbar-bg: linear-gradient(135deg, #0c172e 0%, #060c18 100%);
    --topbar-border: rgba(255, 255, 255, 0.08);
    --topbar-text: #f8fafc;
    --topbar-user-bg: rgba(255, 255, 255, 0.08);

    --modal-overlay: rgba(3, 7, 18, 0.82);
    --modal-bg: #111a2e;
    --modal-border: rgba(255, 255, 255, 0.1);
    --modal-header-bg: #0a1120;
    --table-th-bg: #162238;
    --table-th-text: #94a3b8;
    --table-td-border: #1e2a40;
    --table-hover-bg: #152035;
    --code-bg: #0c1322;
    --code-text: #38bdf8;

    --toggle-container-bg: rgba(17, 26, 46, 0.85);
    --toggle-container-border: #24344d;
    --toggle-active-bg: #24344d;
    --toggle-active-text: #60a5fa;
    --toggle-active-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
    --toggle-inactive-text: #94a3b8;

    --shadow: 0 20px 35px -10px rgba(0, 0, 0, 0.6), 0 0 1px 1px rgba(255, 255, 255, 0.05);
}

/* System preference auto fallback when data-theme is not explicitly forced */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-page: radial-gradient(circle at 50% 0%, #172445 0%, #0c1220 50%, #060911 100%);
        --surface-card: #111a2e;
        --surface-card-border: rgba(255, 255, 255, 0.08);
        --surface-header: linear-gradient(135deg, #0b1c3d 0%, #071022 100%);
        --surface-header-text: #f8fafc;
        --surface-header-sub: #60a5fa;

        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;

        --input-bg: #0c1322;
        --input-border: #24344d;
        --input-text: #f8fafc;
        --input-placeholder: #64748b;
        --input-focus-border: #6366f1;
        --input-focus-glow: rgba(99, 102, 241, 0.3);

        --badge-box-bg: #0c1322;
        --badge-box-border: #1e293b;
        --badge-bg: #162238;
        --badge-border: #2c3e5e;
        --badge-text: #e2e8f0;

        --success-bg: rgba(16, 185, 129, 0.14);
        --success-border: rgba(16, 185, 129, 0.3);
        --success-text: #6ee7b7;
        --danger-bg: rgba(239, 68, 68, 0.14);
        --danger-border: rgba(239, 68, 68, 0.3);
        --danger-text: #fca5a5;
        --warning-bg: rgba(245, 158, 11, 0.14);
        --warning-border: rgba(245, 158, 11, 0.3);
        --warning-text: #fcd34d;
        --info-bg: rgba(59, 130, 246, 0.14);
        --info-border: rgba(59, 130, 246, 0.3);
        --info-text: #93c5fd;

        --topbar-bg: linear-gradient(135deg, #0c172e 0%, #060c18 100%);
        --topbar-border: rgba(255, 255, 255, 0.08);
        --topbar-text: #f8fafc;
        --topbar-user-bg: rgba(255, 255, 255, 0.08);

        --modal-overlay: rgba(3, 7, 18, 0.82);
        --modal-bg: #111a2e;
        --modal-border: rgba(255, 255, 255, 0.1);
        --modal-header-bg: #0a1120;
        --table-th-bg: #162238;
        --table-th-text: #94a3b8;
        --table-td-border: #1e2a40;
        --table-hover-bg: #152035;
        --code-bg: #0c1322;
        --code-text: #38bdf8;

        --toggle-container-bg: rgba(17, 26, 46, 0.85);
        --toggle-container-border: #24344d;
        --toggle-active-bg: #24344d;
        --toggle-active-text: #60a5fa;
        --toggle-active-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
        --toggle-inactive-text: #94a3b8;

        --shadow: 0 20px 35px -10px rgba(0, 0, 0, 0.6), 0 0 1px 1px rgba(255, 255, 255, 0.05);
    }
}

/* ==========================================================================
   Global Base Styles
   ========================================================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.15s ease;
}

body {
    background: var(--bg-page);
    background-attachment: fixed;
    min-height: 100vh;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
}

/* ==========================================================================
   Theme Switcher Component (Segmented 3-Option Control: Light / System / Dark)
   ========================================================================== */

.theme-switch-control {
    display: inline-flex;
    align-items: center;
    background: var(--toggle-container-bg);
    border: 1px solid var(--toggle-container-border);
    border-radius: 30px;
    padding: 3px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    user-select: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.theme-option-btn {
    border: none;
    background: transparent;
    color: var(--toggle-inactive-text);
    padding: 6px 10px;
    border-radius: 24px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    line-height: 1;
}

.theme-option-btn svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
}

.theme-option-btn:hover {
    color: var(--text-primary);
}

.theme-option-btn.active {
    background: var(--toggle-active-bg);
    color: var(--toggle-active-text);
    box-shadow: var(--toggle-active-shadow);
}

/* Floating Dock for Auth Pages (Login, Register, Forgot Password) */
.theme-switch-floating {
    position: fixed;
    top: 18px;
    right: 20px;
    z-index: 100;
}

/* Compact version for Topbars */
.theme-switch-compact .theme-option-btn {
    padding: 5px 8px;
    font-size: 11px;
}

.theme-switch-compact .theme-btn-label {
    display: none;
}

@media (min-width: 640px) {
    .theme-switch-compact .theme-btn-label {
        display: inline;
    }
}

/* ==========================================================================
   Auth Layout & Card
   ========================================================================== */

.auth-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 20px;
}

.auth-card {
    background: var(--surface-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 520px;
    overflow: hidden;
    border: 1px solid var(--surface-card-border);
    transition: var(--transition);
}

.auth-card.wide {
    max-width: 660px;
}

.auth-header {
    background: var(--surface-header);
    color: var(--surface-header-text);
    padding: 30px;
    text-align: center;
    border-bottom: 1px solid var(--surface-card-border);
}

.header-subtitle-big {
    font-size: 20px;
    font-weight: 700;
    color: var(--surface-header-sub);
    margin-top: 8px;
    letter-spacing: 0.3px;
}

.auth-header .logo-badge {
    width: 64px;
    height: 64px;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
}

.auth-header .logo-badge img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.3));
}

.auth-header h1 {
    font-size: 23px;
    font-weight: 700;
    margin-bottom: 6px;
    letter-spacing: -0.5px;
}

.auth-header p {
    font-size: 14px;
    color: var(--text-muted);
}

.auth-body {
    padding: 32px;
}

/* ==========================================================================
   Form Components
   ========================================================================== */

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-grid.single {
    grid-template-columns: 1fr;
}

.form-group {
    margin-bottom: 18px;
    display: flex;
    flex-direction: column;
}

.form-group.col-full {
    grid-column: 1 / -1;
}

.form-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.form-control {
    width: 100%;
    padding: 11px 14px;
    font-size: 14px;
    border: 1.5px solid var(--input-border);
    border-radius: 8px;
    background-color: var(--input-bg);
    color: var(--input-text);
    outline: none;
    transition: var(--transition);
}

.form-control::placeholder {
    color: var(--input-placeholder);
}

.form-control:focus {
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 3px var(--input-focus-glow);
}

/* ==========================================================================
   Device Badge Box
   ========================================================================== */

.device-badge-box {
    background: var(--badge-box-bg);
    border: 1px solid var(--badge-box-border);
    border-radius: 8px;
    padding: 14px;
    margin-bottom: 20px;
}

.device-badge-title {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.device-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.device-badge {
    background: var(--badge-bg);
    border: 1px solid var(--badge-border);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    color: var(--badge-text);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.device-badge strong {
    color: var(--primary);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    width: 100%;
    padding: 12px 18px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 4px 12px var(--primary-glow);
}

/* ==========================================================================
   Alerts & Notifications
   ========================================================================== */

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 13px;
    line-height: 1.5;
    margin-bottom: 18px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.alert-danger {
    background-color: var(--danger-bg);
    color: var(--danger-text);
    border: 1px solid var(--danger-border);
}

.alert-success {
    background-color: var(--success-bg);
    color: var(--success-text);
    border: 1px solid var(--success-border);
}

.alert-warning {
    background-color: var(--warning-bg);
    color: var(--warning-text);
    border: 1px solid var(--warning-border);
}

.alert-info {
    background-color: var(--info-bg);
    color: var(--info-text);
    border: 1px solid var(--info-border);
}

.auth-footer {
    margin-top: 20px;
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
}

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

.auth-footer a:hover {
    text-decoration: underline;
}

/* ==========================================================================
   App Portal Layout & Fullscreen Container
   ========================================================================== */

.portal-container {
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.portal-topbar {
    background: var(--topbar-bg);
    color: var(--topbar-text);
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    border-bottom: 1px solid var(--topbar-border);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    z-index: 10;
}

.portal-topbar .portal-title {
    font-weight: 600;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--topbar-text);
}

.portal-topbar .portal-info {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
}

.portal-topbar .badge-user {
    background: var(--topbar-user-bg);
    color: var(--topbar-text);
    padding: 5px 12px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-weight: 500;
}

.portal-topbar .btn-logout {
    background: #ef4444;
    color: white;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.portal-topbar .btn-logout:hover {
    background: #dc2626;
}

.portal-frame-wrapper {
    flex: 1;
    width: 100%;
    height: calc(100vh - 56px);
    border: none;
    overflow: hidden;
    position: relative;
    background: var(--surface-card);
}

.portal-frame {
    width: 100%;
    height: 100%;
    border: none;
}

/* ==========================================================================
   Admin Approval Modal & Table
   ========================================================================== */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--modal-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.modal-card {
    background: var(--modal-bg);
    border-radius: 12px;
    border: 1px solid var(--modal-border);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    width: 92%;
    max-width: 960px;
    max-height: 88vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.modal-header {
    padding: 16px 24px;
    background: var(--modal-header-bg);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--modal-border);
}

.modal-header h2 {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    color: #ffffff;
}

.modal-body {
    padding: 20px 24px;
    overflow-y: auto;
    flex: 1;
    background: var(--modal-bg);
    color: var(--text-primary);
}

.device-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.device-table th {
    text-align: left;
    padding: 11px 12px;
    background: var(--table-th-bg);
    color: var(--table-th-text);
    font-weight: 600;
    border-bottom: 2px solid var(--table-td-border);
}

.device-table td {
    padding: 12px;
    border-bottom: 1px solid var(--table-td-border);
    vertical-align: middle;
    color: var(--text-primary);
}

.device-table tr:hover td {
    background: var(--table-hover-bg);
}

.device-table code {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 3px 6px;
    border-radius: 4px;
    font-family: Consolas, monospace;
    font-size: 12px;
    border: 1px solid var(--table-td-border);
}

.badge-status-approved {
    background: var(--success-bg);
    color: var(--success-text);
    border: 1px solid var(--success-border);
    padding: 3px 8px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 11px;
    text-transform: uppercase;
    display: inline-block;
}

.badge-status-pending {
    background: var(--warning-bg);
    color: var(--warning-text);
    border: 1px solid var(--warning-border);
    padding: 3px 8px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 11px;
    text-transform: uppercase;
    display: inline-block;
}

.badge-status-blocked, .badge-status-rejected {
    background: var(--danger-bg);
    color: var(--danger-text);
    border: 1px solid var(--danger-border);
    padding: 3px 8px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 11px;
    text-transform: uppercase;
    display: inline-block;
}

.btn-table-action {
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 11px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    margin-right: 4px;
    transition: opacity 0.2s ease;
}

.btn-table-action:hover {
    opacity: 0.9;
}

.btn-approve {
    background: #10b981;
    color: #ffffff;
}

.btn-reject {
    background: #ef4444;
    color: #ffffff;
}

/* Scrollbars */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--badge-box-bg);
}
::-webkit-scrollbar-thumb {
    background: var(--toggle-container-border);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}