/* Solar Industrial Design System
   Aesthetic: Industrial warehouse meets solar energy
   Dark theme optimized for warehouse environments
   Gold/amber accents inspired by sunlight and energy
*/

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
    /* Solar Gold Spectrum */
    --solar-50: #fffbeb;
    --solar-100: #fef3c7;
    --solar-200: #fde68a;
    --solar-300: #fcd34d;
    --solar-400: #fbbf24;
    --solar-500: #f59e0b;
    --solar-600: #d97706;
    --solar-700: #b45309;

    /* Industrial Darks */
    --carbon-950: #0a0c0f;
    --carbon-900: #0f1419;
    --carbon-850: #151b23;
    --carbon-800: #1c2128;
    --carbon-700: #262c36;
    --carbon-600: #333a45;
    --carbon-500: #4a5568;
    --carbon-400: #6b7280;
    --carbon-300: #9ca3af;
    --carbon-200: #d1d5db;
    --carbon-100: #f3f4f6;

    /* Semantic - Energy States */
    --energy-high: #10b981;      /* Green - good stock */
    --energy-medium: #f59e0b;    /* Amber - warning */
    --energy-low: #ef4444;       /* Red - critical */
    --energy-neutral: #6366f1;   /* Indigo - info */

    /* Shadows - Dramatic depth */
    --shadow-glow: 0 0 20px rgba(245, 158, 11, 0.15);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-elevated: 0 8px 40px rgba(0, 0, 0, 0.5), 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.3);

    /* Typography */
    --font-display: 'Outfit', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

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

html {
    font-size: 24px;  /* Increased 50% from 16px for better readability */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-display);
    background: var(--carbon-950);
    color: var(--carbon-100);
    line-height: 1.6;
    min-height: 100vh;
}

/* Noise Texture Overlay */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
    z-index: 0;
}

/* Layout Container */
.app-container {
    display: flex;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* ═══════════════════════════════════════════
   SIDEBAR - Industrial Control Panel
   ═══════════════════════════════════════════ */

.sidebar {
    width: 320px;  /* Increased from 260px to accommodate larger fonts */
    background: linear-gradient(180deg, var(--carbon-900) 0%, var(--carbon-950) 100%);
    border-right: 1px solid var(--carbon-700);
    padding: var(--space-6);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

/* Logo */
.sidebar-logo {
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--carbon-700);
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-logo img {
    height: 60px;
    width: auto;
    max-width: 200px;
    object-fit: contain;
}

/* Invert black logo to white for dark backgrounds */
.logo-inverted {
    filter: invert(1) brightness(1.8);
}

/* Navigation Sections */
.nav-section {
    margin-bottom: var(--space-6);
}

.nav-section-title {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--carbon-500);
    margin-bottom: var(--space-3);
    padding-left: var(--space-3);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--carbon-300);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-size: 0.7rem;
    font-weight: 500;
    transition: all 0.2s ease;
    margin-bottom: var(--space-1);
    position: relative;
}

.nav-link:hover {
    background: var(--carbon-800);
    color: var(--carbon-100);
}

.nav-link.active {
    background: linear-gradient(135deg, var(--solar-600) 0%, var(--solar-700) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.nav-link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background: var(--solar-300);
    border-radius: 0 2px 2px 0;
}

.nav-icon {
    width: 20px;
    height: 20px;
    opacity: 0.8;
    flex-shrink: 0;
}

/* ═══════════════════════════════════════════
   MAIN CONTENT AREA
   ═══════════════════════════════════════════ */

.main-content {
    flex: 1;
    margin-left: 320px;  /* Match sidebar width */
    padding: var(--space-8);
    background:
        radial-gradient(ellipse at top right, rgba(245, 158, 11, 0.03) 0%, transparent 50%),
        var(--carbon-950);
    min-height: 100vh;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-8);
}

.page-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--carbon-100);
    margin-bottom: var(--space-2);
}

.page-subtitle {
    color: var(--carbon-400);
    font-size: 0.95rem;
}

/* ═══════════════════════════════════════════
   STATS GRID - Energy Dashboard Style
   ═══════════════════════════════════════════ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-5);
    margin-bottom: var(--space-8);
}

.stat-card {
    background: var(--carbon-850);
    border: 1px solid var(--carbon-700);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--solar-500), var(--solar-400));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.stat-card:hover {
    border-color: var(--carbon-600);
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--carbon-400);
    margin-bottom: var(--space-2);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--carbon-100);
    line-height: 1.2;
}

.stat-value.warning {
    color: var(--energy-medium);
}

.stat-value.success {
    color: var(--energy-high);
}

.stat-value.error {
    color: var(--energy-low);
}

.stat-change {
    font-size: 0.75rem;
    font-weight: 500;
    margin-top: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.stat-change.positive {
    color: var(--energy-high);
}

.stat-change.negative {
    color: var(--energy-low);
}

.stat-change.neutral {
    color: var(--carbon-400);
}

/* ═══════════════════════════════════════════
   CARDS - Industrial Panel Style
   ═══════════════════════════════════════════ */

.card {
    background: var(--carbon-850);
    border: 1px solid var(--carbon-700);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.card-header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--carbon-700);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--carbon-800);
}

.card-title {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--carbon-100);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.card-title::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--solar-500);
    border-radius: 2px;
}

.card-body {
    padding: var(--space-6);
}

/* ═══════════════════════════════════════════
   TABLES - Data Grid Style
   ═══════════════════════════════════════════ */

.table-container {
    overflow-x: auto;
}

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

thead {
    background: var(--carbon-800);
}

th {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--carbon-400);
    padding: var(--space-4) var(--space-5);
    text-align: left;
    border-bottom: 1px solid var(--carbon-700);
}

td {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--carbon-800);
    font-size: 0.9rem;
    color: var(--carbon-200);
}

tr {
    transition: background 0.15s ease;
}

tbody tr:hover {
    background: var(--carbon-800);
}

/* SKU Column - Monospace */
.sku-cell {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--carbon-400);
    letter-spacing: 0.02em;
}

/* Product Name */
.product-name {
    font-weight: 600;
    color: var(--carbon-100);
}

.product-subtitle {
    font-size: 0.75rem;
    color: var(--carbon-500);
    margin-top: var(--space-1);
}

/* Quantity Cells */
.qty-cell {
    font-family: var(--font-mono);
    font-weight: 600;
}

.qty-cell.positive {
    color: var(--energy-high);
}

.qty-cell.negative {
    color: var(--energy-low);
}

/* Low Stock Row Highlight */
tr.low-stock {
    background: rgba(245, 158, 11, 0.08);
    border-left: 3px solid var(--energy-medium);
}

tr.low-stock:hover {
    background: rgba(245, 158, 11, 0.12);
}

tr.critical-stock {
    background: rgba(239, 68, 68, 0.08);
    border-left: 3px solid var(--energy-low);
}

/* ═══════════════════════════════════════════
   BADGES - Status Indicators
   ═══════════════════════════════════════════ */

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    border-radius: 9999px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

.badge-success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--energy-high);
}

.badge-success::before {
    background: var(--energy-high);
    box-shadow: 0 0 6px var(--energy-high);
}

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

.badge-warning::before {
    background: var(--energy-medium);
    box-shadow: 0 0 6px var(--energy-medium);
}

.badge-error {
    background: rgba(239, 68, 68, 0.15);
    color: var(--energy-low);
}

.badge-error::before {
    background: var(--energy-low);
    box-shadow: 0 0 6px var(--energy-low);
}

.badge-neutral {
    background: var(--carbon-700);
    color: var(--carbon-300);
}

.badge-neutral::before {
    background: var(--carbon-400);
}

/* ═══════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-md);
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--solar-500) 0%, var(--solar-600) 100%);
    color: var(--carbon-950);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--solar-400) 0%, var(--solar-500) 100%);
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--carbon-700);
    color: var(--carbon-200);
    border: 1px solid var(--carbon-600);
}

.btn-secondary:hover {
    background: var(--carbon-600);
    border-color: var(--carbon-500);
}

.btn-ghost {
    background: transparent;
    color: var(--carbon-300);
}

.btn-ghost:hover {
    background: var(--carbon-800);
    color: var(--carbon-100);
}

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: 0.75rem;
}

/* ═══════════════════════════════════════════
   ALERTS
   ═══════════════════════════════════════════ */

.alert {
    padding: var(--space-5);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    border: 1px solid;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.3);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
}

.alert-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.alert-title {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--carbon-100);
    margin-bottom: var(--space-1);
}

.alert-text {
    font-size: 0.85rem;
    color: var(--carbon-300);
}

/* ═══════════════════════════════════════════
   FORMS
   ═══════════════════════════════════════════ */

.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--carbon-300);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--carbon-900);
    border: 1px solid var(--carbon-700);
    border-radius: var(--radius-md);
    color: var(--carbon-100);
    font-family: var(--font-display);
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--solar-500);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.15);
}

.form-input::placeholder {
    color: var(--carbon-500);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-5);
}

.form-hint {
    font-size: 0.75rem;
    color: var(--carbon-500);
    margin-top: var(--space-2);
}

/* Search Box */
.search-box {
    position: relative;
}

.search-input {
    padding-left: var(--space-10);
}

.search-icon {
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--carbon-500);
    width: 18px;
    height: 18px;
}

/* ═══════════════════════════════════════════
   CHART PLACEHOLDER
   ═══════════════════════════════════════════ */

.chart-placeholder {
    height: 300px;
    background:
        linear-gradient(135deg, var(--carbon-800) 0%, var(--carbon-850) 100%);
    border: 1px dashed var(--carbon-600);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--carbon-500);
    font-size: 0.875rem;
}

/* ═══════════════════════════════════════════
   TABS
   ═══════════════════════════════════════════ */

.tabs {
    display: flex;
    gap: var(--space-1);
    border-bottom: 1px solid var(--carbon-700);
    margin-bottom: var(--space-6);
}

.tab {
    padding: var(--space-3) var(--space-5);
    color: var(--carbon-400);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: all 0.2s ease;
}

.tab:hover {
    color: var(--carbon-200);
}

.tab.active {
    color: var(--solar-400);
    border-bottom-color: var(--solar-500);
}

/* ═══════════════════════════════════════════
   ANIMATIONS
   ═══════════════════════════════════════════ */

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 8px rgba(245, 158, 11, 0.4);
    }
    50% {
        box-shadow: 0 0 16px rgba(245, 158, 11, 0.6);
    }
}

.pulse-glow {
    animation: pulse-glow 2s ease-in-out infinite;
}

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

.animate-slide-up {
    animation: slide-up 0.3s ease-out forwards;
}

/* Staggered animations for lists */
.stagger-1 { animation-delay: 0.05s; }
.stagger-2 { animation-delay: 0.1s; }
.stagger-3 { animation-delay: 0.15s; }
.stagger-4 { animation-delay: 0.2s; }

/* ═══════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════ */

@media (max-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        z-index: 100;
        transition: transform 0.3s ease;
    }

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

    .main-content {
        margin-left: 0;
        padding: var(--space-5);
    }

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

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

    .page-header {
        flex-direction: column;
        gap: var(--space-4);
    }

    /* Feedback button mobile adjustment */
    .feedback-floating-btn {
        bottom: 16px;
        right: 16px;
        width: 48px;
        height: 48px;
    }
}

/* ═══════════════════════════════════════════
   FEEDBACK SYSTEM
   ═══════════════════════════════════════════ */

/* Floating feedback button */
.feedback-floating-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--solar-500) 0%, var(--solar-600) 100%);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.3),
        0 2px 6px rgba(245, 158, 11, 0.2);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.feedback-floating-btn:hover {
    background: linear-gradient(135deg, var(--solar-400) 0%, var(--solar-500) 100%);
    transform: scale(1.08);
    box-shadow:
        0 6px 16px rgba(0, 0, 0, 0.4),
        0 3px 8px rgba(245, 158, 11, 0.3);
}

.feedback-floating-btn:active {
    transform: scale(1.02);
}

.feedback-floating-btn svg {
    width: 24px;
    height: 24px;
}

/* Feedback modal styles */
#feedback-modal .modal-content {
    max-width: 500px;
}

#feedback-modal textarea {
    min-height: 120px;
    resize: vertical;
}

#feedback-modal .feedback-page-display {
    background: var(--carbon-800);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--carbon-400);
}

/* Feedback list styles */
.feedback-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.feedback-card {
    background: var(--carbon-800);
    border: 1px solid var(--carbon-700);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    transition: border-color 0.2s ease;
}

.feedback-card:hover {
    border-color: var(--carbon-600);
}

.feedback-card.feedback-pending {
    border-left: 3px solid var(--energy-medium);
}

.feedback-card.feedback-approved {
    border-left: 3px solid var(--energy-high);
}

.feedback-card.feedback-rejected {
    border-left: 3px solid var(--energy-low);
}

.feedback-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
}

.feedback-date {
    font-size: 0.75rem;
    color: var(--carbon-500);
}

.feedback-page {
    font-size: 0.75rem;
    color: var(--carbon-500);
    margin-bottom: var(--space-2);
}

.feedback-user {
    font-size: 0.75rem;
    color: var(--carbon-400);
    margin-bottom: var(--space-3);
}

.feedback-text {
    color: var(--carbon-200);
    line-height: 1.5;
    margin-bottom: var(--space-3);
    white-space: pre-wrap;
}

.feedback-admin-comments {
    background: var(--carbon-850);
    border-left: 2px solid var(--solar-500);
    padding: var(--space-3);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    margin-bottom: var(--space-3);
}

.feedback-admin-comments strong {
    color: var(--solar-400);
}

.feedback-github-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--solar-400);
    text-decoration: none;
    font-size: 0.875rem;
    margin-bottom: var(--space-3);
}

.feedback-github-link:hover {
    color: var(--solar-300);
    text-decoration: underline;
}

.feedback-actions {
    display: flex;
    gap: var(--space-2);
    margin-top: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid var(--carbon-700);
}

.feedback-actions .btn {
    flex: 1;
}

/* Empty state for feedback list */
.feedback-list .empty-message {
    text-align: center;
    padding: var(--space-8);
    color: var(--carbon-500);
}