/* ==========================================
   COMMON STYLES - DESIGN SYSTEM
   ========================================== */

:root {
    /* Colors */
    --primary: #6C5CE7;
    --primary-light: #A29BFE;
    --primary-dark: #5A4BD1;
    --secondary: #00CEC9;
    --accent: #FD79A8;
    --success: #00B894;
    --warning: #FDCB6E;
    --danger: #E17055;
    --info: #74B9FF;

    /* Dark theme */
    --bg-primary: #0F0F1A;
    --bg-secondary: #1A1A2E;
    --bg-tertiary: #16213E;
    --bg-card: rgba(26, 26, 46, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.05);

    /* Text */
    --text-primary: #E8E8F0;
    --text-secondary: #A0A0B8;
    --text-muted: #6C6C80;

    /* Borders */
    --border-color: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.12);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(108, 92, 231, 0.3);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6C5CE7, #A29BFE);
    --gradient-secondary: linear-gradient(135deg, #00CEC9, #55EFC4);
    --gradient-accent: linear-gradient(135deg, #FD79A8, #E17055);
    --gradient-dark: linear-gradient(135deg, #0F0F1A, #1A1A2E);

    /* Spacing */
    --sidebar-width: 260px;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Background animated gradient */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(108, 92, 231, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(0, 206, 201, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(253, 121, 168, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

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

/* ==========================================
   FLASH MESSAGES
   ========================================== */
.flash-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.flash-message {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    border-radius: var(--radius-md);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    animation: slideIn 0.3s ease;
    min-width: 300px;
    max-width: 450px;
}

.flash-message.success {
    background: rgba(0, 184, 148, 0.15);
    border-color: rgba(0, 184, 148, 0.3);
    color: var(--success);
}

.flash-message.error {
    background: rgba(225, 112, 85, 0.15);
    border-color: rgba(225, 112, 85, 0.3);
    color: var(--danger);
}

.flash-message i {
    font-size: 18px;
}

.flash-message span {
    flex: 1;
    font-size: 14px;
    font-weight: 500;
}

.flash-close {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    opacity: 0.6;
    transition: var(--transition);
    font-size: 16px;
}

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

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

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

/* ==========================================
   SIDEBAR
   ========================================== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: var(--transition);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-color);
}

.brand-icon {
    width: 42px;
    height: 42px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: white;
    box-shadow: var(--shadow-glow);
}

.brand-text {
    font-size: 22px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.sidebar-menu {
    flex: 1;
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.menu-item.active {
    background: rgba(108, 92, 231, 0.15);
    color: var(--primary-light);
}

.menu-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 24px;
    background: var(--gradient-primary);
    border-radius: 0 4px 4px 0;
}

.menu-item i {
    width: 20px;
    text-align: center;
    font-size: 16px;
}

.sidebar-footer {
    padding: 16px 12px;
    border-top: 1px solid var(--border-color);
}

.admin-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    margin-bottom: 8px;
}

.admin-avatar {
    width: 36px;
    height: 36px;
    background: var(--gradient-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: white;
}

.admin-details {
    display: flex;
    flex-direction: column;
}

.admin-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.admin-role {
    font-size: 11px;
    color: var(--text-muted);
}

.logout-btn {
    color: var(--danger) !important;
}

.logout-btn:hover {
    background: rgba(225, 112, 85, 0.1) !important;
}

.sidebar-toggle {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 1001;
    width: 44px;
    height: 44px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 18px;
    cursor: pointer;
    transition: var(--transition);
}

.sidebar-toggle:hover {
    background: var(--bg-tertiary);
}

/* ==========================================
   MAIN CONTENT
   ========================================== */
.main-content {
    margin-left: var(--sidebar-width);
    padding: 32px;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

.page-header {
    margin-bottom: 32px;
}

.page-header h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

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

/* ==========================================
   CARDS
   ========================================== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.card:hover {
    border-color: var(--border-light);
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

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

/* ==========================================
   STAT CARDS
   ========================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-light);
}

.stat-card.total::before { background: var(--gradient-primary); }
.stat-card.pending::before { background: var(--gradient-accent); }
.stat-card.signed::before { background: var(--gradient-secondary); }

.stat-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
}

.stat-card.total .stat-icon {
    background: rgba(108, 92, 231, 0.15);
    color: var(--primary-light);
}

.stat-card.pending .stat-icon {
    background: rgba(253, 121, 168, 0.15);
    color: var(--accent);
}

.stat-card.signed .stat-icon {
    background: rgba(0, 206, 201, 0.15);
    color: var(--secondary);
}

.stat-info h3 {
    font-size: 28px;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 6px;
}

.stat-info p {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

/* ==========================================
   FORMS
   ========================================== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    transition: var(--transition);
    outline: none;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
}

.form-control::placeholder {
    color: var(--text-muted);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(108, 92, 231, 0.4);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-light);
}

.btn-success {
    background: var(--gradient-secondary);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 206, 201, 0.3);
}

.btn-success:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 206, 201, 0.4);
}

.btn-danger {
    background: rgba(225, 112, 85, 0.15);
    color: var(--danger);
    border: 1px solid rgba(225, 112, 85, 0.2);
}

.btn-danger:hover {
    background: rgba(225, 112, 85, 0.25);
}

.btn-sm {
    padding: 7px 14px;
    font-size: 13px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* ==========================================
   TABLE
   ========================================== */
.table-container {
    overflow-x: auto;
}

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

.data-table th {
    padding: 12px 16px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
}

.data-table td {
    padding: 14px 16px;
    font-size: 14px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.data-table tbody tr {
    transition: var(--transition);
}

.data-table tbody tr:hover {
    background: var(--bg-glass);
}

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

/* ==========================================
   BADGES
   ========================================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.badge-pending {
    background: rgba(253, 203, 110, 0.15);
    color: var(--warning);
}

.badge-signed {
    background: rgba(0, 184, 148, 0.15);
    color: var(--success);
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    padding: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
    margin-top: 40px;
}

/* ==========================================
   404 PAGE
   ========================================== */
.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
}

.error-page h1 {
    font-size: 120px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.error-page p {
    font-size: 18px;
    color: var(--text-secondary);
    margin: 16px 0 32px;
}

/* ==========================================
   FILE UPLOAD
   ========================================== */
.upload-area {
    border: 2px dashed var(--border-light);
    border-radius: var(--radius-lg);
    padding: 48px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(108, 92, 231, 0.05);
}

.upload-area i {
    font-size: 48px;
    color: var(--primary-light);
    margin-bottom: 16px;
}

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

.upload-area p {
    color: var(--text-muted);
    font-size: 14px;
}

.upload-area input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-name {
    margin-top: 12px;
    font-size: 14px;
    color: var(--success);
    font-weight: 500;
}

/* ==========================================
   COPY LINK
   ========================================== */
.copy-link-box {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 8px 8px 8px 16px;
}

.copy-link-box input {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-family: 'Inter', monospace;
    font-size: 13px;
    outline: none;
}

.copy-link-box .btn {
    flex-shrink: 0;
}

/* ==========================================
   DOCUMENT DETAIL
   ========================================== */
.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.detail-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-value {
    font-size: 15px;
    color: var(--text-primary);
    font-weight: 500;
}

/* ==========================================
   FILTER TABS
   ========================================== */
.filter-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.filter-tab {
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    text-decoration: none;
    transition: var(--transition);
}

.filter-tab:hover {
    background: var(--bg-tertiary);
}

.filter-tab.active {
    background: rgba(108, 92, 231, 0.15);
    color: var(--primary-light);
    border-color: rgba(108, 92, 231, 0.3);
}

/* ==========================================
   ACTIONS
   ========================================== */
.actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* ==========================================
   EMPTY STATE
   ========================================== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.4;
}

.empty-state h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 14px;
}

/* ==========================================
   RESPONSIVE
   ========================================== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

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

    .sidebar-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .main-content {
        margin-left: 0;
        padding: 20px;
        padding-top: 72px;
    }

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

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

    .page-header h1 {
        font-size: 22px;
    }

    .filter-tabs {
        overflow-x: auto;
        padding-bottom: 8px;
    }
}