:root {
    --primary: #0066cc;
    --primary-hover: #0056b3;
    --secondary: #5e5e60;
    --bg-dark: #f5f5f7; /* Apple light gray background */
    --text-main: #1d1d1f;
    --text-muted: #86868b;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.08);
    --glass-highlight: rgba(0, 0, 0, 0.03);
    --danger: #ff3b30;
    --success: #34c759;
}

/* Dark mode overrides automatically if user OS prefers dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --primary: #0a84ff;
        --primary-hover: #0070e0;
        --secondary: #98989d;
        --bg-dark: #000000;
        --text-main: #f5f5f7;
        --text-muted: #86868b;
        --glass-bg: rgba(30, 30, 30, 0.75);
        --glass-border: rgba(255, 255, 255, 0.1);
        --glass-highlight: rgba(255, 255, 255, 0.05);
        --danger: #ff453a;
        --success: #32d74b;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
}

/* Dynamic background removed for Apple style */
.background-animation {
    display: none;
}

/* Glassmorphism panels - Apple Frosted Glass */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
}

.glass-panel-strong {
    background: var(--glass-bg);
    backdrop-filter: blur(30px) saturate(150%);
    -webkit-backdrop-filter: blur(30px) saturate(150%);
    border: 1px solid var(--glass-border);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
}

/* Layout */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 3rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo h1 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: -0.01em;
}

nav {
    display: flex;
    gap: 0.5rem;
    background: var(--glass-highlight);
    padding: 0.25rem;
    border-radius: 99px;
    border: 1px solid var(--glass-border);
}

.tab-btn {
    background: transparent;
    color: var(--text-muted);
    border: none;
    padding: 0.4rem 1.25rem;
    border-radius: 99px;
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--text-main);
}

.tab-btn.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 2px 8px rgba(0, 102, 204, 0.3);
}

main {
    padding: 2rem 3rem;
    max-width: 1400px;
    margin: 0 auto;
}

.section-container {
    border-radius: 16px;
    padding: 2rem;
    min-height: 60vh;
    animation: fadeIn 0.4s ease-out forwards;
}

.hidden {
    display: none !important;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--glass-border);
}

.section-header h2 {
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.badge {
    font-size: 0.75rem;
    background: rgba(236, 72, 153, 0.2);
    color: #fbcfe8;
    padding: 0.2rem 0.6rem;
    border-radius: 99px;
    border: 1px solid rgba(236, 72, 153, 0.3);
}

.actions {
    display: flex;
    gap: 1rem;
}

/* UI Elements */
.modern-select {
    background: var(--glass-bg);
    color: var(--text-main);
    border: 1px solid var(--glass-border);
    padding: 0.4rem 1rem;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    min-width: 200px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}

.modern-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.15);
}

.modern-select option {
    background: var(--bg-dark);
}

.primary-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.4rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: all 0.2s;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

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

.primary-btn:active:not(:disabled) {
    transform: scale(0.98);
}

.primary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--secondary);
    box-shadow: none;
}

.secondary-btn {
    background: var(--glass-bg);
    color: var(--text-main);
    border: 1px solid var(--glass-border);
    padding: 0.4rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}

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

/* Removed pulse-glow class for apple clean style */

/* Forms */
.modern-input {
    width: 100%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 0.6rem 0.8rem;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.9rem;
    transition: all 0.2s;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.02);
}

.modern-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.15);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    margin-bottom: 1.2rem;
}

.input-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-main);
}

.required {
    color: var(--danger);
}

.helper-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.2s ease-out;
}

.modal-content {
    border-radius: 16px;
    width: 90%;
    max-width: 400px;
    padding: 2rem;
    position: relative;
    transform: translateY(0);
    transition: transform 0.3s;
}

.large-modal {
    max-width: 800px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
}

.close-modal {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
}

.close-modal:hover {
    color: white;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2rem;
}

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

.full-width {
    grid-column: 1 / -1;
}

/* Tables */
.table-container {
    width: 100%;
    overflow-x: auto;
    border-radius: 12px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    box-shadow: 0 2px 12px rgba(0,0,0,0.03);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.9rem;
}

th, td {
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--glass-border);
    white-space: nowrap;
}

th {
    background: var(--glass-highlight);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    border-bottom: 1px solid var(--glass-border);
}

th:hover {
    background: rgba(0,0,0,0.05);
}

th .sort-icon {
    display: inline-block;
    margin-left: 5px;
    opacity: 0.3;
    width: 12px;
    height: 12px;
    vertical-align: middle;
}

th.sort-asc .sort-icon { opacity: 1; transform: rotate(180deg); color: var(--text-main); }
th.sort-desc .sort-icon { opacity: 1; transform: rotate(0deg); color: var(--text-main); }

table .filter-row th {
    background: transparent;
    padding: 0.3rem 1rem;
    cursor: default;
    border-bottom: 2px solid var(--glass-border);
}

table .filter-row input {
    width: 100%;
    padding: 0.3rem 0.5rem;
    font-size: 0.8rem;
    border-radius: 4px;
    background: var(--bg-dark);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    outline: none;
}

table .filter-row input:focus {
    border-color: var(--primary);
}

tbody tr {
    transition: background 0.1s;
}

tbody tr:hover {
    background: var(--glass-highlight);
}

.placeholder-text {
    text-align: center;
    padding: 4rem;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.action-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: all 0.2s;
}

.action-btn.edit { color: var(--text-main); }
.action-btn.edit:hover { background: rgba(255,255,255,0.1); }
.action-btn.copy { color: var(--success); }
.action-btn.copy:hover { background: rgba(16, 185, 129, 0.1); }
.action-btn.delete { color: var(--danger); }
.action-btn.delete:hover { background: rgba(239, 68, 68, 0.1); }

.td-actions {
    display: flex;
    gap: 0.5rem;
}

/* Utilities */
.error-text {
    color: var(--danger);
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 2000;
}

.toast {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    padding: 0.8rem 1.2rem;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.1);
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    font-weight: 500;
    animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.toast i {
    width: 18px;
    height: 18px;
}

.toast.error i { color: var(--danger); }
.toast.success i { color: var(--success); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}