/* Global CSS Variables and Base Styles */

:root {
    --color-primary: #3182ce;
    --color-primary-dark: #2c5282;
    --color-primary-light: #ebf8ff;

    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #06b6d4;

    --color-text-primary: #2d3748;
    --color-text-secondary: #4a5568;
    --color-text-muted: #a0aec0;
    --color-text-white: #ffffff;

    --color-border: #d1d5db;
    --color-border-light: #e5e7eb;

    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-bg-tertiary: #f3f4f6;
    --color-bg-app: #f3f4f6;

    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-2xl: 24px;
    --spacing-3xl: 32px;

    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;

    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--color-bg-app);
    color: var(--color-text-primary);
    line-height: 1.6;
}

/* -----------------------------------------------------------------------
   Top Banner
   --------------------------------------------------------------------- */

.top-banner {
    height: 60px;
    background: #07294b;
    border-bottom: 1px solid #2c5282;
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 32px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.banner-left .app-title {
    font-size: 18px;
    font-weight: 600;
    color: #ffffff;
    white-space: nowrap;
}

.banner-right {
    margin-left: auto;
}

.settings-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: var(--radius-md);
    color: rgba(255, 255, 255, 0.8);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.settings-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
}

/* -----------------------------------------------------------------------
   App Container
   --------------------------------------------------------------------- */

.app-container {
    display: flex;
    min-height: calc(100vh - 60px);
    margin-top: 60px;
}

/* -----------------------------------------------------------------------
   Sidebar
   --------------------------------------------------------------------- */

.sidebar {
    width: 220px;
    background: #ffffff;
    border-right: 1px solid var(--color-border-light);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: fixed;
    top: 60px;
    bottom: 0;
    left: 0;
    overflow-y: auto;
    transition: width var(--transition-normal);
    z-index: 100;
}

.sidebar.collapsed {
    width: 60px;
}

.sidebar.collapsed .nav-item span {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

.sidebar-collapse-toggle {
    width: 32px;
    height: 32px;
    margin: 12px 12px 0 auto;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.sidebar-collapse-toggle:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.sidebar.collapsed .sidebar-collapse-toggle {
    margin: 12px auto 0;
}

.sidebar.collapsed .sidebar-collapse-toggle .fa-angles-left::before {
    content: "\f101"; /* fa-angles-right */
}

.nav-menu {
    list-style: none;
    padding: 4px 0 16px;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin: 2px 12px;
    border-radius: var(--radius-lg);
    position: relative;
    white-space: nowrap;
    user-select: none;
}

.nav-item:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

.nav-item.active {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    font-weight: 500;
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 75%;
    width: 3px;
    background: var(--color-primary);
    border-radius: 0 2px 2px 0;
}

.nav-icon {
    margin-right: 12px;
    font-size: 16px;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.nav-item span {
    font-size: 14px;
    transition: opacity var(--transition-normal);
}

/* -----------------------------------------------------------------------
   Main Content
   --------------------------------------------------------------------- */

.main-content {
    flex: 1;
    margin-left: 220px;
    min-height: calc(100vh - 60px);
    max-width: calc(100vw - 220px);
    overflow-x: hidden;
    background: var(--color-bg-app);
    transition: margin-left var(--transition-normal);
}

.sidebar.collapsed ~ .main-content,
.main-content.sidebar-collapsed {
    margin-left: 60px;
    max-width: calc(100vw - 60px);
}

.page-content {
    padding: var(--spacing-3xl);
}

/* -----------------------------------------------------------------------
   Cards
   --------------------------------------------------------------------- */

.card {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
}

/* -----------------------------------------------------------------------
   Buttons
   --------------------------------------------------------------------- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 38px;
    padding: 0 18px;
    border-radius: var(--radius-md);
    border: none;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition-fast), opacity var(--transition-fast);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--color-border-light);
}

/* -----------------------------------------------------------------------
   Form Controls
   --------------------------------------------------------------------- */

.text-input {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
}

.text-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.1);
}

/* -----------------------------------------------------------------------
   Badges
   --------------------------------------------------------------------- */

.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.badge-success  { background: #d1fae5; color: #065f46; }
.badge-error    { background: #fee2e2; color: #991b1b; }
.badge-warning  { background: #fef3c7; color: #92400e; }
.badge-info     { background: #dbeafe; color: #1e40af; }

/* -----------------------------------------------------------------------
   Tables
   --------------------------------------------------------------------- */

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
}

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

thead th {
    background: var(--color-bg-secondary);
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}

tbody td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--color-border-light);
    color: var(--color-text-primary);
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr:hover td {
    background: var(--color-bg-secondary);
}

/* -----------------------------------------------------------------------
   Modal
   --------------------------------------------------------------------- */

.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal-overlay.open {
    display: flex;
}

.modal {
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 420px;
    max-width: calc(100vw - 32px);
}

.modal-header {
    padding: var(--spacing-xl) var(--spacing-2xl) var(--spacing-md);
    border-bottom: 1px solid var(--color-border-light);
}

.modal-header h2 {
    font-size: 16px;
    font-weight: 600;
}

.modal-body {
    padding: var(--spacing-xl) var(--spacing-2xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.modal-body p {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.modal-footer {
    padding: var(--spacing-md) var(--spacing-2xl) var(--spacing-xl);
    display: flex;
    justify-content: flex-end;
}

.modal-error {
    font-size: 13px;
    color: var(--color-error);
    min-height: 18px;
}

/* -----------------------------------------------------------------------
   Empty / Loading states
   --------------------------------------------------------------------- */

.state-message {
    padding: var(--spacing-3xl);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 14px;
}