/* ==================================
   xRobo - Design System & Styles
   ================================== */

/* --- CSS Variables --- */
:root {
    --color-bg: #0a0a0f;
    --color-bg-card: #12121a;
    --color-bg-elevated: #1a1a26;
    --color-bg-input: #1e1e2e;
    --color-border: #2a2a3a;
    --color-border-hover: #3a3a4d;

    --color-text: #e8e8f0;
    --color-text-secondary: #8888a0;
    --color-text-muted: #5a5a70;

    --color-primary: #6366f1;
    --color-primary-hover: #818cf8;
    --color-primary-glow: rgba(99, 102, 241, 0.25);

    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;

    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-card: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.03) 100%);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--color-primary-glow);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: all 0.2s ease;
}

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

html {
    font-size: 15px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* --- Navbar --- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.2rem;
}

.brand-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: 0.25rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-text);
    background: var(--color-bg-elevated);
}

.nav-link.active {
    color: var(--color-primary-hover);
    background: rgba(99, 102, 241, 0.1);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-email {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.logout-form {
    display: inline;
}

/* --- Main Content --- */
.main-content {
    padding: 2rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* --- Page Header --- */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.page-description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin-top: 0.25rem;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary-hover);
    border: 1px solid var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.08);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.btn-ghost:hover {
    color: var(--color-text);
    border-color: var(--color-border-hover);
}

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-sm {
    padding: 0.35rem 0.85rem;
    font-size: 0.8rem;
}

.btn-full {
    width: 100%;
}

/* --- Cards --- */
.stat-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-sm);
}

.stat-icon {
    font-size: 1.75rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-sm);
}

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

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

/* --- Sections --- */
.section {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 1.1rem;
    font-weight: 600;
}

/* --- Account Cards --- */
.account-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.account-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.account-card:hover {
    background: var(--color-bg-input);
}

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

.account-avatar,
.account-avatar-lg {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    font-size: 1.1rem;
}

.account-avatar-lg {
    width: 52px;
    height: 52px;
    font-size: 1.3rem;
}

.account-name,
.account-name-lg {
    font-weight: 600;
    font-size: 0.95rem;
}

.account-name-lg {
    font-size: 1.1rem;
}

.account-handle {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

.account-meta {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

/* --- Account Detail Cards --- */
.accounts-grid {
    display: grid;
    gap: 1.5rem;
}

.account-detail-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.account-detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    background: var(--gradient-card);
}

.account-detail-body {
    padding: 1.5rem;
}

.detail-section {
    margin-bottom: 1.5rem;
}

.detail-section:last-child {
    margin-bottom: 0;
}

.detail-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.detail-stats {
    display: flex;
    gap: 2rem;
}

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

.detail-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.detail-stat-label {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

/* --- Badges --- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.65rem;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-info {
    background: rgba(59, 130, 246, 0.15);
    color: var(--color-info);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.15);
    color: var(--color-warning);
}

.badge-success {
    background: rgba(34, 197, 94, 0.15);
    color: var(--color-success);
}

/* --- Forms --- */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 0.4rem;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.65rem 0.9rem;
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    transition: var(--transition);
    outline: none;
}

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

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

.form-textarea {
    resize: vertical;
    min-height: 80px;
}

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238888a0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

/* --- Flash Messages --- */
.flash-messages {
    max-width: 1200px;
    margin: 0 auto 1rem;
    padding: 0 1.5rem;
}

.flash {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    animation: slideDown 0.3s ease;
}

.flash-success {
    background: rgba(34, 197, 94, 0.12);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: var(--color-success);
}

.flash-error {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--color-danger);
}

.flash-close {
    background: none;
    border: none;
    color: inherit;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0.6;
    transition: var(--transition);
}

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

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Login --- */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem;
}

.login-card {
    width: 100%;
    max-width: 400px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
}

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

.login-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 0.75rem;
}

.login-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.login-subtitle {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

.login-form .form-group:last-of-type {
    margin-bottom: 1.5rem;
}

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.empty-state p {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
}

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

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.data-table th,
.data-table td {
    padding: 0.75rem 1rem;
    text-align: left;
}

.data-table th {
    color: var(--color-text-secondary);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 1px solid var(--color-border);
}

.data-table td {
    border-bottom: 1px solid rgba(42, 42, 58, 0.5);
}

.data-table tr:hover td {
    background: rgba(99, 102, 241, 0.03);
}

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

/* --- Chart --- */
.chart-container {
    position: relative;
    height: 300px;
    margin-top: 1rem;
}

/* --- Utilities --- */
.text-center {
    text-align: center;
}

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

/* --- Responsive --- */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .nav-container {
        padding: 0 1rem;
    }

    .nav-links {
        gap: 0;
    }

    .nav-link {
        padding: 0.4rem 0.6rem;
        font-size: 0.8rem;
    }

    .user-email {
        display: none;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .container {
        padding: 0 1rem;
    }
}