/* Zeta Backoffice - Apple Style Theme */
:root {
    --primary: #007AFF;
    --primary-hover: #0056CC;
    --success: #34C759;
    --warning: #FF9500;
    --danger: #FF3B30;
    --bg: #F5F5F7;
    --bg-card: #FFFFFF;
    --bg-secondary: #F2F2F7;
    --text: #1D1D1F;
    --text-secondary: #86868B;
    --border: #E5E5EA;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --radius: 12px;
    --radius-lg: 20px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* LOGIN */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    background: linear-gradient(180deg, #FFFFFF 0%, #F5F5F7 100%);
}

.login-box {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    width: 100%;
    max-width: 380px;
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.login-logo {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary) 0%, #5856D6 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.login-logo i {
    font-size: 28px;
    color: white;
}

.login-box h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.login-box .subtitle {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 32px;
}

/* FORM */
.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-secondary);
    border: 1px solid transparent;
    border-radius: 10px;
    color: var(--text);
    font-size: 16px;
    transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    background: var(--bg-card);
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.form-group input::placeholder {
    color: var(--text-secondary);
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: scale(1.02);
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover {
    filter: brightness(0.95);
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    filter: brightness(0.95);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text);
}

.btn-secondary:hover {
    background: var(--border);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--bg-secondary);
    color: var(--text);
}

.btn-full { width: 100%; }
.btn-sm { padding: 8px 16px; font-size: 13px; }

/* APP */
.app-container {
    display: none;
}

/* HEADER */
.header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 16px 32px;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 20px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 12px;
    letter-spacing: -0.3px;
}

.header h1 .logo {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary) 0%, #5856D6 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.header h1 .logo i {
    font-size: 18px;
    color: white;
}

.header-actions {
    display: flex;
    gap: 12px;
}

.main-content {
    padding: 32px;
    max-width: 1200px;
    margin: 0 auto;
}

/* STATS */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.stat-card .icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 20px;
}

.stat-card .icon.blue { background: rgba(0, 122, 255, 0.1); color: var(--primary); }
.stat-card .icon.green { background: rgba(52, 199, 89, 0.1); color: var(--success); }
.stat-card .icon.orange { background: rgba(255, 149, 0, 0.1); color: var(--warning); }
.stat-card .icon.purple { background: rgba(88, 86, 214, 0.1); color: #5856D6; }

.stat-card .value {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 4px;
}

.stat-card .label {
    color: var(--text-secondary);
    font-size: 14px;
}

/* TABS */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 32px;
    background: var(--bg-secondary);
    padding: 4px;
    border-radius: 12px;
    width: fit-content;
}

.tab {
    padding: 10px 20px;
    background: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

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

.tab.active {
    background: var(--bg-card);
    color: var(--text);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.tab-content { display: none; }
.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

/* CARDS */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 28px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.card-header h2 {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.3px;
}

/* UPLOAD */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 48px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    background: var(--bg-secondary);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(0, 122, 255, 0.05);
}

.upload-zone .upload-icon {
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, var(--primary) 0%, #5856D6 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.upload-zone .upload-icon i {
    font-size: 32px;
    color: white;
}

.upload-zone h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.upload-zone p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 15px;
}

.upload-zone .formats {
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--bg-card);
    padding: 8px 16px;
    border-radius: 20px;
    display: inline-block;
}

#fileInput { display: none; }

/* BADGES */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success { background: rgba(52, 199, 89, 0.15); color: var(--success); }
.badge-warning { background: rgba(255, 149, 0, 0.15); color: var(--warning); }
.badge-danger { background: rgba(255, 59, 48, 0.15); color: var(--danger); }
.badge-primary { background: rgba(0, 122, 255, 0.15); color: var(--primary); }

/* MODAL */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

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

.modal {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    width: 90%;
    max-width: 480px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-header h3 {
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    background: var(--bg-secondary);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.modal-close:hover {
    background: var(--border);
    color: var(--text);
}

.modal-footer {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

/* TOAST */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
}

.toast {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 16px 20px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    min-width: 280px;
}

.toast.success .toast-icon { color: var(--success); }
.toast.error .toast-icon { color: var(--danger); }
.toast.warning .toast-icon { color: var(--warning); }
.toast-icon { font-size: 20px; }

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

/* LOADING */
.loading {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* CATEGORIES */
.collection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.collection-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.collection-card:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 20px rgba(0, 122, 255, 0.1);
}

.collection-card h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.collection-card h3 i { color: var(--primary); }

.collection-card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
    line-height: 1.5;
}

.collection-card .actions {
    display: flex;
    gap: 8px;
}

/* LINKS */
.link-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    margin-bottom: 12px;
    transition: all 0.2s;
}

.link-item:hover {
    background: var(--bg-card);
    box-shadow: var(--shadow);
}

.link-item .info {
    flex: 1;
    min-width: 0;
}

.link-item .title {
    font-weight: 600;
    margin-bottom: 4px;
    font-size: 15px;
}

.link-item .url {
    font-size: 13px;
    color: var(--text-secondary);
    word-break: break-all;
}

.link-item .badges {
    margin-top: 8px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.link-item .actions {
    display: flex;
    gap: 8px;
    margin-left: 16px;
}

/* TUNING */
.tuning-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.tuning-stat {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
}

.tuning-stat .value {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.tuning-stat .label {
    font-size: 13px;
    color: var(--text-secondary);
}

.info-box {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 24px;
}

.info-box h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.info-box h4 i { color: var(--primary); }

.info-box p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

.info-box ul {
    margin-top: 12px;
    padding-left: 20px;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 2;
}

/* SYNC STATUS */
.sync-status {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    margin-bottom: 20px;
}

.sync-status.synced { border-left: 4px solid var(--success); }
.sync-status.pending { border-left: 4px solid var(--warning); }
.sync-status.error { border-left: 4px solid var(--danger); }

.sync-status .icon { font-size: 24px; }
.sync-status.synced .icon { color: var(--success); }
.sync-status.pending .icon { color: var(--warning); }
.sync-status.error .icon { color: var(--danger); }

.sync-status .info { flex: 1; }
.sync-status .title { font-weight: 600; margin-bottom: 2px; }
.sync-status .desc { font-size: 13px; color: var(--text-secondary); }

/* RESPONSIVE */
@media (max-width: 1024px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .tuning-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .header { padding: 12px 20px; }
    .header-inner { flex-direction: column; gap: 12px; }
    .main-content { padding: 20px; }
    .stats-grid { grid-template-columns: 1fr; }
    .tuning-stats { grid-template-columns: 1fr 1fr; }
    .tabs { width: 100%; overflow-x: auto; }
    .collection-grid { grid-template-columns: 1fr; }
    .modal { width: 95%; padding: 24px; }
    .link-item { flex-direction: column; align-items: flex-start; }
    .link-item .actions { margin-left: 0; margin-top: 12px; }
}