/* ========================================
   ILKE Content Hub - Premium Dark Theme
   ======================================== */

:root {
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.8);
    --bg-card-hover: rgba(30, 41, 59, 0.8);
    --bg-input: rgba(15, 23, 42, 0.9);
    --border-color: rgba(99, 102, 241, 0.15);
    --border-hover: rgba(99, 102, 241, 0.35);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.12);
    --error: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.12);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.12);
    --warning: #f59e0b;
    --sidebar-width: 260px;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --glass-bg: rgba(17, 24, 39, 0.6);
    --glass-border: rgba(255, 255, 255, 0.08);
}

/* ========== Reset & Base ========== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
}

/* Background gradient */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(59, 130, 246, 0.04) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* ========== Sidebar ========== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    padding: 1.5rem 0;
}

.sidebar-header {
    padding: 0 1.5rem 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: 0.5rem;
}

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

.logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 0 8px var(--accent-glow));
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 50%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-subtitle {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 500;
}

.nav-links {
    list-style: none;
    flex: 1;
    padding: 0.5rem 0.75rem;
}

.nav-links li {
    margin-bottom: 2px;
}

.nav-links a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.7rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover {
    background: rgba(99, 102, 241, 0.08);
    color: var(--text-primary);
}

.nav-links a.active {
    background: rgba(99, 102, 241, 0.15);
    color: var(--accent-hover);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.08);
}

.nav-links a.active::before {
    content: '';
    position: absolute;
    left: -0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background: var(--accent);
    border-radius: 0 3px 3px 0;
}

.nav-icon {
    font-size: 1.1rem;
    width: 1.5rem;
    text-align: center;
}

.sidebar-footer {
    padding: 0.75rem;
    border-top: 1px solid var(--glass-border);
}

.logout-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.7rem 1rem;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
}

.logout-btn:hover {
    background: var(--error-bg);
    color: var(--error);
}

/* ========== Main Content ========== */
.content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 2rem 2.5rem;
    position: relative;
    z-index: 1;
    min-height: 100vh;
}

.content-full {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1;
    min-height: 100vh;
}

/* ========== Page Header ========== */
.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ========== Cards ========== */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    margin-bottom: 1.25rem;
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    border-color: var(--border-color);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
}

.card-header {
    padding: 1.25rem 1.5rem 0.75rem;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
}

.card-header h2 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-hint {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 400;
}

.card-body {
    padding: 0.75rem 1.5rem 1.5rem;
}

.card-wide {
    grid-column: span 2;
}

.card-info {
    border-color: rgba(59, 130, 246, 0.2);
}

/* ========== Stats Grid ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--border-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.stat-card.accent {
    border-color: rgba(34, 197, 94, 0.3);
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.06) 0%, var(--bg-card) 100%);
}

.stat-icon {
    font-size: 2rem;
    filter: drop-shadow(0 2px 8px rgba(99, 102, 241, 0.2));
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ========== Section Row ========== */
.section-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

/* ========== Tables ========== */
.table-wrapper {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead th {
    text-align: left;
    padding: 0.75rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--glass-border);
}

tbody td {
    padding: 0.75rem 1rem;
    font-size: 0.88rem;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

tbody tr:hover {
    background: rgba(99, 102, 241, 0.04);
}

.td-title {
    color: var(--text-primary);
    font-weight: 500;
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.td-date {
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

.td-sub {
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    background: rgba(99, 102, 241, 0.12);
    color: var(--accent-hover);
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 500;
    white-space: nowrap;
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.link-btn {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.85rem;
    transition: var(--transition);
    white-space: nowrap;
}

.link-btn:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* ========== Forms ========== */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input[type="text"],
input[type="password"],
input[type="number"],
select {
    width: 100%;
    padding: 0.7rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    transition: var(--transition);
    outline: none;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.textarea-full {
    width: 100%;
    padding: 0.9rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'Inter', monospace;
    font-size: 0.88rem;
    line-height: 1.6;
    resize: vertical;
    outline: none;
    transition: var(--transition);
    min-height: 120px;
}

.settings-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    max-width: 400px;
}

.form-actions {
    margin-top: 0.5rem;
    margin-bottom: 2rem;
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.7rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, #7c3aed 100%);
    color: white;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.btn-accent {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
    color: white;
    box-shadow: 0 4px 14px rgba(34, 197, 94, 0.3);
    padding: 0.85rem 2rem;
    font-size: 1rem;
}

.btn-accent:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(34, 197, 94, 0.4);
}

.btn-accent:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-full {
    width: 100%;
}

.btn-small {
    padding: 0.45rem 0.9rem;
    font-size: 0.8rem;
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    transition: var(--transition);
    line-height: 1;
}

.btn-delete {
    color: var(--text-muted);
    font-weight: 600;
}

.btn-delete:hover {
    color: var(--error);
    background: var(--error-bg);
}

/* ========== Topics ========== */
.topics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

.topic-list {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 1rem;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.topic-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    transition: var(--transition);
    gap: 0.5rem;
}

.topic-item:hover {
    background: rgba(99, 102, 241, 0.06);
}

.topic-name {
    font-size: 0.85rem;
    color: var(--text-secondary);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.inline-form {
    display: inline;
}

.add-form {
    border-top: 1px solid var(--glass-border);
    padding-top: 1rem;
}

.input-row {
    display: flex;
    gap: 0.5rem;
}

.input-row input {
    flex: 1;
}

/* ========== Info Grid ========== */
.info-grid {
    display: grid;
    gap: 0.75rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.info-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.info-value {
    font-size: 0.85rem;
    color: var(--text-primary);
    font-weight: 500;
}

.info-value a {
    color: var(--accent);
    text-decoration: none;
}

.info-value a:hover {
    text-decoration: underline;
}

.info-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ========== Empty State ========== */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
}

.empty-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    color: var(--text-muted);
    max-width: 400px;
    margin: 0 auto;
}

/* ========== Flash Messages ========== */
.flash-messages {
    margin-bottom: 1.5rem;
}

.flash {
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    animation: slideDown 0.3s ease;
}

.flash-success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.flash-error {
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.flash-info {
    background: var(--info-bg);
    color: var(--info);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.flash-close {
    background: none;
    border: none;
    color: inherit;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0.6;
    padding: 0 0.25rem;
}

.flash-close:hover {
    opacity: 1;
}

/* ========== Login Page ========== */
.login-body {
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 1.5rem;
}

.login-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo {
    font-size: 3.5rem;
    margin-bottom: 0.75rem;
    filter: drop-shadow(0 4px 12px var(--accent-glow));
}

.login-header h1 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--accent) 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.4rem;
}

.login-subtitle {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.login-footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--glass-border);
}

.login-footer p {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

/* ========== Animations ========== */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== Scrollbars ========== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .content {
        margin-left: 0;
        padding: 1.5rem;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .topics-grid {
        grid-template-columns: 1fr;
    }

    .settings-row {
        grid-template-columns: 1fr;
    }

    .card-wide {
        grid-column: span 1;
    }

    .td-title {
        max-width: 180px;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .login-card {
        padding: 1.75rem;
    }
}