/* Dark dashboard theme with FreeServer-inspired layout */
:root {
    --color-bg: #040915;
    --color-surface: #111a2a;
    --color-surface-alt: #0b1322;
    --color-sidebar: #0a101d;
    --color-panel: #0f182a;
    --color-primary: #6ba4ff;
    --color-primary-strong: #4387ff;
    --color-secondary: #f59f0b;
    --color-success: #34d399;
    --color-danger: #f87171;
    --color-warning: #facc15;
    --color-border: rgba(67, 83, 110, 0.45);
    --color-border-strong: rgba(99, 115, 150, 0.7);
    --color-shadow: rgba(5, 11, 22, 0.55);
    --text-strong: #f3f4f6;
    --text-muted: #c0cad8;
    --text-subtle: #92a0b9;
    --font-sans: 'Noto Sans TC', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 22px;
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 0.7rem;
    --space-5: 1.5rem;
    --space-6: 2rem;
    --space-7: 3rem;
    --shadow-sm: 0 12px 28px rgba(5, 11, 22, 0.45);
    --shadow-md: 0 20px 46px rgba(4, 9, 21, 0.55);
}

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

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    background: radial-gradient(circle at top, rgba(67, 126, 255, 0.18), rgba(4, 9, 21, 0.9)), var(--color-bg);
    color: var(--text-strong);
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    display: block;
    max-width: 100%;
}

button,
input,
select,
textarea {
    font-family: inherit;
    font-size: 1rem;
    color: inherit;
}

button {
    cursor: pointer;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    margin: 0;
    font-weight: 600;
    color: var(--text-strong);
}

p {
    margin: 0;
    color: var(--text-muted);
}

/* Icon support */
.icon,
[class^="lucide"],
[class*=" lucide"],
[class^="feather"],
[class*=" feather"],
[class^="ti-"],
[class*=" ti-"],
[class^="fa"],
[class*=" fa"],
[class^="icon-"],
[class*=" icon-"],
svg.icon,
svg.feather,
svg.lucide,
svg.ti,
svg.heroicon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.1em;
    height: 1.1em;
    stroke-width: 1.8;
    color: inherit;
    fill: none;
}

/* ============================================
   主要佈局 / Main Layout
   ============================================ */

.dashboard-container {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
    background: radial-gradient(circle at top right, rgba(67, 126, 255, 0.12), rgba(4, 9, 21, 0.95));
}

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 260px;
    background: linear-gradient(180deg, rgba(11, 17, 31, 0.98) 0%, rgba(7, 12, 24, 0.98) 100%);
    border-right: 1px solid rgba(67, 83, 110, 0.4);
    padding: var(--space-5) var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    overflow-y: auto;
    z-index: 10;
    transform: translateX(0);
    transition: transform 0.3s ease;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-strong);
    padding: var(--space-3);
    margin-bottom: var(--space-2);
    border-bottom: 1px solid rgba(67, 83, 110, 0.3);
}

.logo-image {
    width: 45px;
    height: 45px;
    object-fit: contain;
}

.logo i {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    flex: 1;
}

.sidebar-nav a,
.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.sidebar-nav a::before,
.nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    transform: translateX(-4px);
    transition: transform 0.3s ease;
}

.sidebar-nav a:hover,
.sidebar-nav a.active,
.nav-item:hover,
.nav-item.active {
    background: linear-gradient(90deg, rgba(107, 164, 255, 0.18) 0%, rgba(107, 164, 255, 0.08) 100%);
    color: var(--text-strong);
    transform: translateX(4px);
}

.sidebar-nav a:hover::before,
.sidebar-nav a.active::before,
.nav-item:hover::before,
.nav-item.active::before {
    transform: translateX(0);
}

.sidebar-nav a i,
.nav-item i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
    color: var(--color-primary);
}

.nav-divider {
    margin: var(--space-4) 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(67, 83, 110, 0.5) 50%, transparent 100%);
    border: none;
}

.user-menu {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, rgba(17, 26, 42, 0.95) 0%, rgba(11, 19, 35, 0.95) 100%);
    border: 1px solid rgba(107, 164, 255, 0.3);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.user-menu:hover {
    border-color: rgba(107, 164, 255, 0.5);
    box-shadow: 0 8px 20px rgba(5, 11, 22, 0.4);
}

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid rgba(107, 164, 255, 0.5);
    flex-shrink: 0;
}

.user-name {
    color: var(--text-strong);
    font-weight: 600;
    font-size: 0.95rem;
}

.dashboard-main {
    grid-column: 2;
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    min-height: 100vh;
}

.dashboard-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.topbar {
    display: none;
}

.topbar-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.topbar-stat-item {
    background: linear-gradient(135deg, rgba(17, 26, 42, 0.95) 0%, rgba(11, 19, 35, 0.95) 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.topbar-stat-item:hover {
    transform: translateY(-2px);
    border-color: rgba(107, 164, 255, 0.5);
}

.topbar-stat-label {
    font-size: 0.75rem;
    color: var(--text-subtle);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.topbar-stat-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-strong);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.topbar-stat-value i {
    color: var(--color-primary);
}

.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    padding-bottom: var(--space-4);
    margin-bottom: var(--space-2);
}

.page-header > div {
    flex: 1;
}

.page-header h1 {
    font-size: 2.2rem;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
    background: linear-gradient(135deg, var(--text-strong) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ============================================
   資源統計卡片 / Stats Cards
   ============================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-4);
}

.stat-card,
.stat-item {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.stat-card:hover,
.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.summary-grid {
    gap: var(--space-4);
}

.summary-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    background: linear-gradient(135deg, rgba(17, 26, 42, 0.95) 0%, rgba(11, 19, 35, 0.95) 100%);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
}

.summary-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.summary-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 45px rgba(5, 11, 22, 0.6);
    border-color: rgba(107, 164, 255, 0.5);
}

.summary-card:hover::before {
    opacity: 1;
}

.summary-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.summary-card:hover .summary-icon {
    transform: scale(1.1) rotate(5deg);
}

.summary-card[data-tone="cpu"] .summary-icon {
    color: #76b4ff;
    background: linear-gradient(135deg, rgba(67, 135, 255, 0.25), rgba(107, 164, 255, 0.15));
}

.summary-card[data-tone="ram"] .summary-icon {
    color: #4ade80;
    background: linear-gradient(135deg, rgba(52, 211, 153, 0.25), rgba(16, 185, 129, 0.15));
}

.summary-card[data-tone="disk"] .summary-icon {
    color: #c084fc;
    background: linear-gradient(135deg, rgba(192, 132, 252, 0.25), rgba(168, 85, 247, 0.15));
}

.summary-card[data-tone="servers"] .summary-icon {
    color: #fbbf24;
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.25), rgba(245, 158, 11, 0.15));
}

/* Backups tone (參考伺服器/磁碟風格，使用琥珀橘) */
.summary-card[data-tone="backups"] .summary-icon {
    color: #f43f5e;
    background: linear-gradient(135deg, rgba(244, 63, 94, 0.25), rgba(244, 63, 94, 0.12));
}

/* Allocations tone (參考記憶體風格，使用綠色系) */
.summary-card[data-tone="allocations"] .summary-icon {
    color: #06b6d4;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.25), rgba(6, 182, 212, 0.12));
}

.summary-content {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.summary-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-subtle);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.summary-value {
    display: flex;
    align-items: baseline;
    gap: var(--space-1);
    font-weight: 600;
}

.summary-value strong {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-strong);
}

.summary-value .value-unit {
    font-size: 0.95rem;
    color: var(--text-subtle);
}

.summary-percent {
    font-weight: 600;
    color: var(--text-muted);
}

.summary-card[data-tone="cpu"] .summary-percent {
    color: #76b4ff;
}

.summary-card[data-tone="ram"] .summary-percent {
    color: #4ade80;
}

.summary-card[data-tone="disk"] .summary-percent {
    color: #c084fc;
}

.summary-card[data-tone="servers"] .summary-percent {
    color: #fbbf24;
}

.summary-card[data-tone="backups"] .summary-percent {
    color: #f43f5e;
}

.summary-card[data-tone="allocations"] .summary-percent {
    color: #06b6d4;
}

.summary-card .progress-bar {
    position: relative;
    width: 100%;
    height: 6px;
    border-radius: 999px;
    background: rgba(148, 163, 184, 0.25);
    overflow: hidden;
}

.summary-card .progress-fill {
    position: absolute;
    inset: 0;
    border-radius: inherit;
    width: 0;
    transition: width 0.4s ease;
}

.summary-card[data-tone="cpu"] .progress-fill {
    background: linear-gradient(90deg, #4387ff 0%, #6ba4ff 100%);
}

.summary-card[data-tone="ram"] .progress-fill {
    background: linear-gradient(90deg, #2dd4bf 0%, #34d399 100%);
}

.summary-card[data-tone="disk"] .progress-fill {
    background: linear-gradient(90deg, #a855f7 0%, #6366f1 100%);
}

.summary-card[data-tone="servers"] .progress-fill {
    background: linear-gradient(90deg, #f59f0b 0%, #f97316 100%);
}

.summary-card[data-tone="backups"] .progress-fill {
    background: linear-gradient(90deg, #fb7185 0%, #f43f5e 100%);
}

.summary-card[data-tone="allocations"] .progress-fill {
    background: linear-gradient(90deg, #06b6d4 0%, #22d3ee 100%);
}

.stat-label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-subtle);
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 700;
}

/* Panels */
.info-panel,
.panel-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-4);
}

.info-item,
.current-balance {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    padding: var(--space-4);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.current-balance {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
}

/* ============================================
   儀表板雙欄佈局 / Dashboard Columns
   ============================================ */

.dashboard-columns {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: var(--space-5);
    align-items: start;
}

.dashboard-primary {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    min-width: 0;
}

.dashboard-secondary {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    position: sticky;
    top: var(--space-5);
    max-height: calc(100vh - var(--space-7));
    overflow-y: auto;
}

.dashboard-card {
    background: linear-gradient(135deg, rgba(17, 26, 42, 0.95) 0%, rgba(11, 19, 35, 0.95) 100%);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    padding: var(--space-5);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.dashboard-card:hover {
    border-color: rgba(107, 164, 255, 0.4);
    box-shadow: 0 16px 40px rgba(5, 11, 22, 0.6);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid rgba(67, 83, 110, 0.3);
}

.card-header h2 {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-strong);
}

.card-header h2 i {
    color: var(--color-primary);
    font-size: 1.2rem;
}

.info-list {
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.info-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    padding: var(--space-2) 0;
    border-bottom: 1px solid rgba(67, 83, 110, 0.4);
}

.info-row:last-child {
    border-bottom: none;
}

.info-row dt {
    font-size: 0.85rem;
    color: var(--text-subtle);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-row dd {
    margin: 0;
    margin-left: auto;
    color: var(--text-strong);
    font-weight: 500;
    text-align: right;
}

.info-row dd a {
    color: var(--color-primary);
}

.server-name {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    color: var(--text-strong);
    font-weight: 500;
}

.server-name > i {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(107, 164, 255, 0.2) 0%, rgba(67, 135, 255, 0.1) 100%);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    margin-top: 2px;
}

.server-name > div {
    flex: 1;
    min-width: 0;
}

.table-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    align-items: center;
    justify-content: center;
}

.table-actions .btn-sm {
    min-width: 36px;
    height: 36px;
    padding: var(--space-2) var(--space-3);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    white-space: nowrap;
}

.table-actions .btn-sm:hover {
    transform: translateY(-2px);
}

.table-actions .btn-sm.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-strong) 100%);
    border: 1px solid var(--color-primary);
}

.table-actions .btn-sm.btn-primary:hover {
    box-shadow: 0 4px 12px rgba(107, 164, 255, 0.4);
}

.table-actions .btn-sm.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    border: 1px solid #ef4444;
}

.table-actions .btn-sm.btn-danger:hover {
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}


.table-actions .btn {
    padding: var(--space-1) var(--space-2);
    min-width: 0;
}

.servers-table td,
.servers-table th {
    vertical-align: middle;
}

.servers-table td:first-child {
    white-space: normal;
}

.password-field {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.password-field input {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    border: 1px solid rgba(101, 120, 150, 0.65);
    background: rgba(12, 20, 34, 0.9);
    color: var(--text-strong);
    font-size: 0.95rem;
}

.password-field input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(107, 164, 255, 0.22);
}

.password-field .btn {
    flex: 0 0 auto;
}

.panel-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.panel-actions .btn {
    flex: 1 1 auto;
}

.empty-state.compact {
    padding: var(--space-7) var(--space-5);
    background: rgba(16, 24, 40, 0.6);
    border: 1px dashed rgba(107, 164, 255, 0.3);
    border-radius: var(--radius-lg);
}

.empty-state.compact i {
    font-size: 3rem;
    opacity: 0.5;
    margin-bottom: var(--space-3);
}

.empty-state.compact p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: var(--space-4);
}

.servers-card .data-table {
    margin-top: var(--space-2);
}

.info-card .info-row {
    padding: var(--space-2) 0;
}

.panel-card .panel-actions {
    margin-top: var(--space-3);
}

/* Server cards */
.servers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-4);
}

.server-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.server-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.server-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-3);
}

.server-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    color: var(--text-subtle);
}

.server-status {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.95rem;
}

.server-status .status-dot {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: rgba(146, 160, 185, 0.6);
}

.status-running {
    color: var(--color-success);
}

.status-running .status-dot {
    background: var(--color-success);
}

.status-stopped {
    color: var(--text-subtle);
}

.status-installing {
    color: var(--color-warning);
}

.status-installing .status-dot {
    background: var(--color-warning);
}

/* ============================================
   資料表格 / Data Tables
   ============================================ */

.table-responsive {
    width: 100%;
    overflow-x: auto;
    border-radius: var(--radius-lg);
}

.data-table {
    width: 100%;
    min-width: 640px;
    background: transparent;
    border-collapse: separate;
    border-spacing: 0;
}

.data-table thead {
    background: linear-gradient(135deg, rgba(107, 164, 255, 0.15) 0%, rgba(67, 135, 255, 0.1) 100%);
}

.data-table thead th {
    padding: var(--space-4);
    text-align: left;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-strong);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid rgba(107, 164, 255, 0.3);
}

.data-table thead th:first-child {
    border-top-left-radius: var(--radius-lg);
}

.data-table thead th:last-child {
    border-top-right-radius: var(--radius-lg);
}

.data-table tbody tr {
    border-bottom: 1px solid rgba(67, 83, 110, 0.3);
    transition: all 0.3s ease;
}

.data-table tbody tr:hover {
    background: rgba(107, 164, 255, 0.1);
}

.data-table tbody tr:last-child {
    border-bottom: none;
}

.data-table tbody td {
    padding: var(--space-4);
    font-size: 0.95rem;
    color: var(--text-muted);
    vertical-align: middle;
}

/* ============================================
   按鈕樣式 / Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-lg);
    border: 1px solid transparent;
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.2;
    background: rgba(17, 26, 42, 0.85);
    color: var(--text-strong);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    cursor: pointer;
    white-space: nowrap;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(5, 11, 22, 0.5);
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: var(--shadow-sm);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-strong) 100%);
    color: #071121;
    box-shadow: 0 8px 24px rgba(107, 164, 255, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 12px 32px rgba(107, 164, 255, 0.4);
}

.btn-secondary {
    background: rgba(107, 164, 255, 0.15);
    border-color: rgba(107, 164, 255, 0.45);
    color: var(--color-primary);
}

.btn-secondary:hover {
    background: rgba(107, 164, 255, 0.25);
    border-color: rgba(107, 164, 255, 0.65);
}

.btn-success {
    background: linear-gradient(135deg, var(--color-success) 0%, #10b981 100%);
    color: #04120f;
    box-shadow: 0 8px 24px rgba(52, 211, 153, 0.3);
}

.btn-success:hover {
    box-shadow: 0 12px 32px rgba(52, 211, 153, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, var(--color-danger) 0%, #dc2626 100%);
    color: var(--text-strong);
    box-shadow: 0 8px 24px rgba(248, 113, 113, 0.3);
}

.btn-danger:hover {
    box-shadow: 0 12px 32px rgba(248, 113, 113, 0.4);
}

.btn-warning {
    background: linear-gradient(135deg, var(--color-warning) 0%, #f59e0b 100%);
    color: #1c1200;
    box-shadow: 0 8px 24px rgba(250, 204, 21, 0.3);
}

.btn-warning:hover {
    box-shadow: 0 12px 32px rgba(250, 204, 21, 0.4);
}

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: 0.85rem;
}

.btn-discord {
    width: 100%;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    background: #5865f2;
    color: #ffffff;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-discord:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Alerts */
.alert {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    background: rgba(17, 26, 42, 0.92);
    color: var(--text-muted);
    box-shadow: var(--shadow-sm);
}

.alert-info {
    border-color: rgba(107, 164, 255, 0.4);
    background: rgba(39, 78, 156, 0.4);
}

.alert-success {
    border-color: rgba(52, 211, 153, 0.35);
    background: rgba(15, 83, 63, 0.55);
}

.alert-error {
    border-color: rgba(248, 113, 113, 0.4);
    background: rgba(86, 29, 29, 0.55);
}

.alert-warning {
    border-color: rgba(250, 204, 21, 0.45);
    background: rgba(118, 69, 0, 0.55);
    color: #fef3c7;
}

/* Forms */
.form-card,
.form-section {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    padding: var(--space-5);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.form-section h2 {
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-4);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-group label,
.form-card label {
    font-size: 0.9rem;
    color: var(--text-subtle);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.form-group label svg,
.form-card label svg,
.form-group label i,
.form-card label i {
    color: var(--color-primary);
}

.form-group input,
.form-group select,
.form-group textarea,
.form-card input,
.form-card select,
.form-card textarea {
    width: 100%;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    border: 1px solid rgba(101, 120, 150, 0.65);
    background: rgba(12, 20, 34, 0.95);
    color: var(--text-strong);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    min-height: 44px;
}

.form-group textarea,
.form-card textarea {
    min-height: 120px;
    resize: vertical;
}

.form-group select,
.form-card select {
    appearance: none;
    cursor: pointer;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus,
.form-card input:focus,
.form-card select:focus,
.form-card textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(107, 164, 255, 0.22);
    background: rgba(17, 26, 42, 0.95);
}

.form-group small {
    font-size: 0.85rem;
    color: var(--text-subtle);
}

.form-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid rgba(67, 83, 110, 0.45);
}

.checkbox-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    color: var(--text-muted);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary);
}

/* Menu grid */
.menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-4);
}

.menu-item {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    padding: var(--space-5) var(--space-4);
    text-align: center;
    color: var(--text-strong);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.menu-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.menu-item svg,
.menu-item i {
    display: block;
    font-size: 2.2rem;
    margin-bottom: var(--space-3);
    color: var(--color-primary);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-5);
    background: rgba(2, 6, 15, 0.75);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
    z-index: 100;
}

.modal.show {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    width: min(640px, 100%);
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-header,
.modal-body,
.modal-footer {
    padding: var(--space-5);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    border-bottom: 1px solid var(--color-border);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    border-top: 1px solid var(--color-border);
}

.modal-close {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: rgba(107, 164, 255, 0.12);
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease, color 0.2s ease;
}

.modal-close:hover {
    background: rgba(107, 164, 255, 0.22);
    color: var(--text-strong);
}

/* Pricing */
.price-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-4);
    margin: var(--space-5) 0;
}

.price-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    padding: var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.price-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.price-icon {
    width: 68px;
    height: 68px;
    border-radius: var(--radius-lg);
    background: rgba(107, 164, 255, 0.18);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.price-card .price {
    font-size: 2.3rem;
    font-weight: 700;
}

.price-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    color: var(--text-muted);
}

.total-cost {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    padding: var(--space-4);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.cost-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--text-muted);
}

.cost-item.total {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-strong);
}

.empty-state {
    border: 1px dashed rgba(107, 164, 255, 0.3);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    text-align: center;
    color: var(--text-muted);
    background: rgba(16, 24, 40, 0.75);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    align-items: center;
    justify-content: center;
}

.error-page {
    min-height: calc(100vh - 120px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
}

.error-container {
    max-width: 420px;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
}

/* Login */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--space-6);
    background: radial-gradient(circle at top, rgba(107, 164, 255, 0.28), rgba(4, 9, 21, 0.95));
}

.login-container {
    width: 100%;
    max-width: 460px;
}

.login-card {
    background: var(--color-panel);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: var(--space-6);
}

.login-header h1 {
    text-align: center;
    margin-bottom: var(--space-2);
}

.login-header p {
    text-align: center;
    color: var(--text-subtle);
    margin-bottom: var(--space-4);
}

.login-footer {
    text-align: center;
    margin-top: var(--space-4);
    color: var(--text-subtle);
    font-size: 0.9rem;
}

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

.show {
    display: block !important;
}

/* ============================================
   響應式設計 / Responsive Design
   ============================================ */

/* 移動端側邊欄切換按鈕 */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: var(--space-3);
    left: var(--space-3);
    z-index: 100;
    width: 44px;
    height: 44px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--text-strong);
    font-size: 1.2rem;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.sidebar-toggle:hover {
    background: var(--color-panel);
    border-color: var(--color-primary);
    transform: scale(1.05);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(2, 6, 15, 0.75);
    z-index: 99;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.show {
    display: block;
    opacity: 1;
}

/* 桌面大屏 / Large Desktop (≤1200px) */
@media (max-width: 1200px) {
    .dashboard-columns {
        grid-template-columns: 1fr 350px;
        gap: var(--space-4);
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    }

    .servers-grid {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    }
}

/* 平板裝置 / Tablet (≤992px) */
@media (max-width: 992px) {
    .dashboard-container {
        grid-template-columns: 1fr;
    }

    .sidebar-toggle {
        display: flex !important;
    }

    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        width: 260px;
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-4);
        padding: var(--space-5) var(--space-4);
        overflow-y: auto;
        overflow-x: hidden;
        border-right: 1px solid rgba(67, 83, 110, 0.4);
        border-bottom: none;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 100;
    }

    .sidebar.show {
        transform: translateX(0) !important;
    }

    .sidebar-nav {
        flex-direction: column;
        flex-wrap: nowrap;
    }

    .sidebar-nav a,
    .nav-item {
        white-space: normal;
    }

    .dashboard-main {
        grid-column: 1;
        padding: var(--space-4);
        margin-top: 0;
    }

    .dashboard-columns {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .dashboard-secondary {
        position: static;
        max-height: none;
    }

    .panel-actions .btn {
        flex: 1 1 100%;
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }

    .info-panel,
    .panel-info {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

/* 小型平板與大型手機 / Small Tablet & Large Phone (≤768px) */
@media (max-width: 768px) {
    .dashboard-main {
        padding: var(--space-4);
        padding-top: calc(var(--space-4) + 60px);
    }

    .topbar-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-2);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }

    .servers-grid,
    .info-panel,
    .panel-info,
    .menu-grid,
    .price-cards {
        grid-template-columns: 1fr;
    }

    .current-balance {
        flex-direction: column;
        align-items: stretch;
    }

    .form-actions {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-2);
    }

    .form-actions .btn {
        width: 100%;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
    }
    
    .page-header h1 {
        font-size: 1.9rem;
    }
    
    .page-header .btn {
        width: 100%;
    }

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

    .summary-icon {
        width: 52px;
        height: 52px;
        font-size: 1.7rem;
    }

    .data-table {
        min-width: 600px;
    }

    .table-responsive {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .table-responsive::-webkit-scrollbar {
        height: 8px;
    }

    .table-responsive::-webkit-scrollbar-track {
        background: rgba(15, 24, 40, 0.5);
        border-radius: 4px;
    }

    .table-responsive::-webkit-scrollbar-thumb {
        background: rgba(107, 164, 255, 0.4);
        border-radius: 4px;
    }

    .table-responsive::-webkit-scrollbar-thumb:hover {
        background: rgba(107, 164, 255, 0.6);
    }

    .modal-content {
        width: min(90%, 100%);
        margin: var(--space-4);
    }

    .user-menu {
        flex-direction: column;
        text-align: center;
        gap: var(--space-2);
    }

    .user-avatar {
        width: 40px;
        height: 40px;
    }
}

/* 手機裝置 / Mobile (≤576px) */
@media (max-width: 576px) {
    .dashboard-main {
        padding: var(--space-3);
        padding-top: calc(var(--space-3) + 60px);
    }
    
    .dashboard-card,
    .form-card,
    .form-section,
    .server-card,
    .price-card,
    .total-cost,
    .info-item,
    .login-card {
        padding: var(--space-4);
    }
    
    .stats-grid,
    .topbar-stats {
        grid-template-columns: 1fr;
    }

    .summary-card {
        padding: var(--space-3);
        gap: var(--space-3);
    }
    
    .summary-icon {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
    }
    
    .summary-value strong {
        font-size: 1.6rem;
    }
    
    .page-header {
        padding-bottom: var(--space-3);
    }

    .page-header h1 {
        font-size: 1.6rem;
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }

    .card-header h2 {
        font-size: 1.1rem;
    }

    .card-header .btn {
        width: 100%;
    }

    .btn {
        width: 100%;
        padding: var(--space-3) var(--space-4);
    }
    
    .table-actions {
        flex-direction: column;
        gap: var(--space-2);
    }
    
    .table-actions .btn {
        width: 100%;
    }

    .data-table {
        min-width: 500px;
        font-size: 0.9rem;
    }

    .data-table thead th,
    .data-table tbody td {
        padding: var(--space-3);
        font-size: 0.85rem;
    }

    .data-table thead th {
        white-space: nowrap;
    }

    .modal {
        padding: var(--space-3);
    }

    .modal-content {
        width: 100%;
        margin: 0;
        max-height: 90vh;
        overflow-y: auto;
    }

    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--space-4);
    }

    .modal-header {
        flex-wrap: wrap;
    }

    .login-card {
        padding: var(--space-5);
    }

    .sidebar {
        padding: var(--space-2);
        width: 280px;
    }

    .logo {
        font-size: 1.1rem;
        padding: var(--space-2);
    }

    .logo-image {
        width: 40px;
        height: 40px;
    }

    .sidebar-nav a,
    .nav-item {
        padding: var(--space-2) var(--space-3);
        font-size: 0.9rem;
    }

    .user-menu {
        padding: var(--space-3);
    }

    .user-avatar {
        width: 36px;
        height: 36px;
    }

    .user-name {
        font-size: 0.85rem;
    }
}

/* 小手機裝置 / Small Mobile (≤480px) */
@media (max-width: 480px) {
    .dashboard-main {
        padding: var(--space-2);
        padding-top: calc(var(--space-2) + 60px);
    }

    .dashboard-card,
    .form-card,
    .form-section,
    .server-card,
    .price-card,
    .info-item {
        padding: var(--space-3);
    }

    .page-header h1 {
        font-size: 1.4rem;
    }

    .summary-value strong {
        font-size: 1.4rem;
    }

    .summary-icon {
        width: 44px;
        height: 44px;
        font-size: 1.3rem;
    }

    .card-header h2 {
        font-size: 1rem;
    }

    .data-table {
        min-width: 450px;
        font-size: 0.85rem;
    }

    .data-table thead th,
    .data-table tbody td {
        padding: var(--space-2);
    }

    .btn {
        padding: var(--space-2) var(--space-3);
        font-size: 0.9rem;
    }

    .btn-sm {
        padding: var(--space-1) var(--space-2);
        font-size: 0.8rem;
    }

    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--space-3);
    }

    .login-card {
        padding: var(--space-4);
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: var(--space-2) var(--space-3);
        font-size: 0.9rem;
    }

    .sidebar {
        width: 100%;
        max-width: 320px;
    }

    .sidebar-toggle {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }

    .stats-grid {
        gap: var(--space-2);
    }

    .summary-card {
        padding: var(--space-2);
    }
}