/* ===== 煜英启智 - 深色科技主题 ===== */

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

:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #0f1340;
    --bg-card: rgba(15, 19, 64, 0.7);
    --bg-card-hover: rgba(20, 30, 80, 0.85);
    --cyan: #00d4ff;
    --cyan-dark: #0099cc;
    --blue: #0066ff;
    --purple: #7b2dff;
    --green: #00ff88;
    --orange: #ff6b35;
    --red: #ff3860;
    --gold: #ffd700;
    --text-primary: #e0e6ff;
    --text-secondary: #8892b0;
    --text-muted: #5a6380;
    --border-color: rgba(0, 212, 255, 0.15);
    --glow-cyan: 0 0 20px rgba(0, 212, 255, 0.3), 0 0 40px rgba(0, 212, 255, 0.1);
    --glow-blue: 0 0 20px rgba(0, 102, 255, 0.3);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
        "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 17px;
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--cyan-dark);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--cyan);
}

a {
    color: var(--cyan);
    text-decoration: none;
    transition: var(--transition);
}
a:hover {
    color: #fff;
    text-shadow: 0 0 10px var(--cyan);
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 14, 39, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 2rem;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 14, 39, 0.98);
    box-shadow: 0 2px 30px rgba(0, 0, 0, 0.5);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--cyan);
    text-shadow: var(--glow-cyan);
}

.nav-logo .logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: #fff;
    box-shadow: var(--glow-cyan);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-links a {
    color: var(--text-secondary);
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    font-size: 1.05rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--cyan);
    background: rgba(0, 212, 255, 0.08);
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--cyan);
    box-shadow: 0 0 10px var(--cyan);
    border-radius: 1px;
}

.nav-auth {
    display: flex;
    gap: 10px;
    align-items: center;
}

.nav-user {
    color: var(--cyan);
    font-size: 1rem;
    margin-right: 8px;
}

/* Mobile menu */
.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}
.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--cyan);
    transition: var(--transition);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    color: #fff;
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(0, 212, 255, 0.5);
    color: #fff;
    text-shadow: none;
}

.btn-secondary {
    background: transparent;
    color: var(--cyan);
    border: 1px solid var(--cyan);
}
.btn-secondary:hover {
    background: rgba(0, 212, 255, 0.1);
    transform: translateY(-2px);
    color: var(--cyan);
    text-shadow: none;
}

.btn-danger {
    background: linear-gradient(135deg, var(--red), #cc2d50);
    color: #fff;
}
.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(255, 56, 96, 0.4);
    color: #fff;
    text-shadow: none;
}

.btn-sm {
    padding: 8px 18px;
    font-size: 0.9rem;
}

.btn-lg {
    padding: 16px 40px;
    font-size: 1.15rem;
}

/* ===== Cards ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--cyan), transparent);
    opacity: 0;
    transition: var(--transition);
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(0, 212, 255, 0.3);
    transform: translateY(-4px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3), var(--glow-cyan);
}

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

/* ===== Section Layout ===== */
.section {
    padding: 100px 0;
    position: relative;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto;
}

.section-header .line {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--cyan), var(--blue));
    margin: 1rem auto 0;
    border-radius: 2px;
    box-shadow: 0 0 10px var(--cyan);
}

/* ===== Grid Background ===== */
.grid-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    background-image:
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

/* ===== Particle Canvas ===== */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    pointer-events: none;
}

/* ===== Page Header ===== */
.page-header {
    padding: 120px 0 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center top, rgba(0, 212, 255, 0.08), transparent 60%);
    pointer-events: none;
}

.page-header h1 {
    font-size: 3.2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--cyan), var(--blue), var(--purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.25rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 70px;
    position: relative;
}

.hero-content {
    max-width: 800px;
    z-index: 1;
}

.hero h1 {
    font-size: 5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero h1 .gradient-text {
    background: linear-gradient(135deg, var(--cyan), var(--blue), var(--purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .subtitle {
    font-size: 1.8rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    min-height: 2rem;
}

.hero .hero-desc {
    font-size: 1.4rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    line-height: 2;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-glow {
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.1), transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: pulse-glow 4s ease-in-out infinite;
    pointer-events: none;
}

/* ===== Stats Counter ===== */
.stats-section {
    padding: 60px 0;
    background: rgba(0, 0, 0, 0.2);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--cyan);
    text-shadow: var(--glow-cyan);
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* ===== Features / Cards Grid ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    text-align: center;
    padding: 2.5rem 2rem;
}

.feature-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(0, 102, 255, 0.15));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--cyan);
    border: 1px solid rgba(0, 212, 255, 0.2);
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.25), rgba(0, 102, 255, 0.25));
    box-shadow: var(--glow-cyan);
    transform: scale(1.1);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.7;
}

/* ===== About Cards ===== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.about-card {
    padding: 2.5rem;
}

.about-card .card-number {
    font-size: 4rem;
    font-weight: 800;
    color: rgba(0, 212, 255, 0.1);
    line-height: 1;
    margin-bottom: 1rem;
}

.about-card h3 {
    font-size: 1.6rem;
    margin-bottom: 1rem;
    color: var(--cyan);
}

.about-card ul {
    list-style: none;
    padding: 0;
}

.about-card ul li {
    padding: 8px 0;
    color: var(--text-secondary);
    font-size: 1.1rem;
    position: relative;
    padding-left: 20px;
}

.about-card ul li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--cyan);
}

/* ===== Timeline ===== */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--cyan), var(--blue), var(--purple));
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -33px;
    top: 1.5rem;
    width: 12px;
    height: 12px;
    background: var(--cyan);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--cyan);
}

.timeline-item h4 {
    color: var(--cyan);
    margin-bottom: 0.5rem;
}

.timeline-item p {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

/* ===== Inventory Table ===== */
.inventory-container {
    margin-top: 2rem;
}

.inventory-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.search-box {
    display: flex;
    gap: 8px;
}

.search-box input,
.search-box select {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.search-box input:focus,
.search-box select:focus {
    border-color: var(--cyan);
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.2);
}

.table-wrapper {
    overflow-x: auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
}

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

thead th {
    background: rgba(0, 212, 255, 0.05);
    color: var(--cyan);
    font-weight: 600;
    padding: 16px 18px;
    text-align: left;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

tbody td {
    padding: 14px 18px;
    border-bottom: 1px solid rgba(0, 212, 255, 0.05);
    font-size: 1rem;
    color: var(--text-secondary);
}

tbody tr {
    transition: var(--transition);
}

tbody tr:hover {
    background: rgba(0, 212, 255, 0.03);
}

.status-badge {
    display: inline-block;
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}

.status-in_stock {
    background: rgba(0, 255, 136, 0.1);
    color: var(--green);
    border: 1px solid rgba(0, 255, 136, 0.2);
}

.status-out_stock {
    background: rgba(255, 107, 53, 0.1);
    color: var(--orange);
    border: 1px solid rgba(255, 107, 53, 0.2);
}

.actions-cell {
    display: flex;
    gap: 6px;
    flex-wrap: nowrap;
}

/* ===== Forms ===== */
.form-container {
    max-width: 700px;
    margin: 2rem auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    color: var(--cyan);
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.form-input {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    font-size: 1.05rem;
    font-family: inherit;
    outline: none;
    transition: var(--transition);
}

.form-input:focus {
    border-color: var(--cyan);
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.15);
}

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

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

select.form-input {
    cursor: pointer;
}

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

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* ===== Contact ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.contact-card {
    padding: 2rem;
    text-align: center;
}

.contact-card .icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(0, 102, 255, 0.15));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--cyan);
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.contact-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

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

.auth-card {
    width: 100%;
    max-width: 420px;
    padding: 3rem;
    text-align: center;
}

.auth-card h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-card .auth-subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.auth-card .form-group {
    text-align: left;
}

.auth-link {
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.auth-link a {
    color: var(--cyan);
    font-weight: 600;
}

/* ===== Dashboard ===== */
.dashboard-container {
    padding-top: 90px;
    min-height: 100vh;
}

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

.dashboard-header h1 {
    font-size: 2.4rem;
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.dash-stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.dash-stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--cyan), var(--blue));
}

.dash-stat-card .stat-value {
    font-size: 3rem;
    font-weight: 800;
    color: var(--cyan);
    text-shadow: var(--glow-cyan);
}

.dash-stat-card .stat-title {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-top: 0.3rem;
}

.dashboard-charts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    min-height: 350px;
}

.chart-card h3 {
    color: var(--cyan);
    font-size: 1.15rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.chart-box {
    width: 100%;
    height: 280px;
}

/* ===== Footer ===== */
.footer {
    background: rgba(0, 0, 0, 0.3);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    font-size: 1.5rem;
    color: var(--cyan);
    margin-bottom: 1rem;
    text-shadow: var(--glow-cyan);
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
}

.footer-links h4 {
    color: var(--text-primary);
    font-size: 1.15rem;
    margin-bottom: 1rem;
}

.footer-links ul {
    list-style: none;
}

.footer-links ul li {
    margin-bottom: 0.5rem;
}

.footer-links ul li a {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 1rem;
}

/* ===== Messages / Alerts ===== */
.messages {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.alert {
    padding: 14px 22px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    animation: slideInRight 0.4s ease, fadeOut 0.4s ease 3s forwards;
    max-width: 380px;
}

.alert-success {
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid rgba(0, 255, 136, 0.3);
    color: var(--green);
}

.alert-error {
    background: rgba(255, 56, 96, 0.1);
    border: 1px solid rgba(255, 56, 96, 0.3);
    color: var(--red);
}

.alert-warning {
    background: rgba(255, 215, 0, 0.1);
    border: 1px solid rgba(255, 215, 0, 0.3);
    color: var(--gold);
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-muted);
}

.empty-state p {
    font-size: 1.1rem;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

@keyframes pulse-glow {
    0%, 100% { opacity: 0.5; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 1; transform: translate(-50%, -50%) scale(1.1); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes typing {
    from { width: 0; }
    to { width: 100%; }
}

@keyframes blink-cursor {
    0%, 100% { border-right-color: var(--cyan); }
    50% { border-right-color: transparent; }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 992px) {
    .features-grid,
    .about-grid {
        grid-template-columns: 1fr;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .dashboard-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    .dashboard-charts {
        grid-template-columns: 1fr;
    }
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .hero h1 {
        font-size: 3.5rem;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 0 1rem;
    }
    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(10, 14, 39, 0.98);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
    }
    .nav-links.active {
        display: flex;
    }
    .nav-toggle {
        display: flex;
    }
    .hero h1 {
        font-size: 3rem;
    }
    .hero .subtitle {
        font-size: 1.4rem;
    }
    .section-header h2 {
        font-size: 2rem;
    }
    .page-header h1 {
        font-size: 2.5rem;
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    .stat-number {
        font-size: 2.5rem;
    }
    .inventory-toolbar {
        flex-direction: column;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .dashboard-stats {
        grid-template-columns: 1fr;
    }
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
}