/* styles.css - tema dark eco modern untuk EcoSort AI, responsif dan interaktif */

:root {
    --bg-main: #0F1C15;
    --bg-alt: #142419;
    --card-bg: #1A2E22;
    --card-bg-hover: #223A2A;
    --accent-primary: #3ED598;
    --accent-primary-hover: #33BD87;
    --accent-secondary: #6FE0C5;
    --warning: #F0A868;
    --text-main: #EAF3EC;
    --text-muted: #93A99C;
    --border-color: #24392C;
    --radius: 16px;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    --shadow-hover: 0 14px 40px rgba(0, 0, 0, 0.5);
    --transition: 0.25s ease;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
}

.icon {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

.icon-xl {
    width: 48px;
    height: 48px;
    color: var(--accent-primary);
}

/* ===== Navbar ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(15, 28, 21, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 24px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--accent-primary);
    font-weight: 700;
    font-size: 20px;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-main);
    cursor: pointer;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 28px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: color var(--transition);
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--accent-primary);
}

.nav-menu a.active::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-primary);
}

/* ===== Buttons ===== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--accent-primary);
    color: #0F1C15;
    padding: 13px 28px;
    border: none;
    border-radius: 999px;
    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background-color var(--transition), transform var(--transition);
}

.btn-primary:hover {
    background-color: var(--accent-primary-hover);
    transform: translateY(-2px);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    padding: 80px 20px 50px;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: -120px;
    left: 50%;
    transform: translateX(-50%);
    width: 480px;
    height: 480px;
    background: radial-gradient(circle, rgba(62, 213, 152, 0.18) 0%, rgba(62, 213, 152, 0) 70%);
    z-index: -1;
}

.hero h1 {
    font-size: clamp(26px, 4vw, 38px);
    margin-bottom: 14px;
}

.hero p {
    font-size: 16px;
    margin-bottom: 26px;
    color: var(--text-muted);
}

/* ===== Statistik beranimasi ===== */
.stats-section {
    background-color: var(--bg-alt);
    padding: 40px 20px;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 34px;
    font-weight: 700;
    color: var(--accent-secondary);
}

.stat-card p {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 4px;
}

/* ===== Definition section ===== */
.definition-section {
    padding: 60px 20px 40px;
    text-align: center;
}

.definition-section h2 {
    font-size: 26px;
    margin-bottom: 28px;
}

.definition-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    max-width: 1100px;
    margin: 0 auto;
}

.definition-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 28px 22px;
    text-align: left;
    box-shadow: var(--shadow);
    transition: box-shadow var(--transition), transform var(--transition), background-color var(--transition);
}

.definition-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
    background-color: var(--card-bg-hover);
}

.definition-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background-color: rgba(62, 213, 152, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
    margin-bottom: 16px;
}

.definition-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

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

/* ===== Workflow section ===== */
.workflow-section {
    padding: 50px 20px;
    text-align: center;
    background-color: var(--bg-alt);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.workflow-section h2 {
    font-size: 26px;
    margin-bottom: 28px;
}

.workflow-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.workflow-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--accent-primary);
    color: #0F1C15;
    border-radius: 50%;
}

.workflow-step h3 {
    font-size: 16px;
    margin-bottom: 6px;
}

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

/* ===== Category grid ===== */
.category-section {
    padding: 60px 20px;
    text-align: center;
}

.category-section h2 {
    font-size: 26px;
    margin-bottom: 26px;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 18px;
    max-width: 1100px;
    margin: 0 auto;
}

.category-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 22px 14px;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    background-color: var(--card-bg-hover);
}

.category-badge {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
}

.category-badge.recyclable {
    background-color: rgba(62, 213, 152, 0.15);
    color: var(--accent-primary);
}

.category-badge.residue {
    background-color: rgba(240, 168, 104, 0.15);
    color: var(--warning);
}

.category-card h3 {
    font-size: 16px;
}

.category-card p {
    font-size: 13px;
    color: var(--text-muted);
}

.cta-section {
    text-align: center;
    padding: 60px 20px;
}

.cta-section h2 {
    font-size: 24px;
    margin-bottom: 18px;
}

/* ===== Classify page ===== */
.classify-section {
    max-width: 640px;
    margin: 50px auto;
    text-align: center;
    padding: 0 20px;
}

.classify-subtitle {
    color: var(--text-muted);
    margin-bottom: 20px;
}

.upload-box {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    padding: 50px 20px;
    background-color: var(--card-bg);
    cursor: pointer;
    margin: 24px 0;
    transition: border-color var(--transition), background-color var(--transition);
}

.upload-box:hover {
    border-color: var(--accent-primary);
    background-color: var(--card-bg-hover);
}

.upload-box img {
    max-width: 100%;
    max-height: 250px;
    border-radius: 10px;
    margin-top: 12px;
}

#uploadText {
    margin-top: 12px;
    color: var(--text-muted);
}

.validation-text {
    color: var(--warning);
    min-height: 20px;
    font-size: 14px;
}

.loading-box {
    margin-top: 20px;
}

.progress-bar {
    width: 100%;
    height: 10px;
    background-color: var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    margin-top: 8px;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background-color: var(--accent-primary);
    transition: width 0.4s ease;
}

/* ===== Kartu hasil analisis ===== */
.result-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 28px;
    margin-top: 24px;
    text-align: left;
    box-shadow: var(--shadow);
    animation: fadeIn 0.5s ease-in;
}

.result-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 18px;
}

.result-icon {
    width: 50px;
    height: 50px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.result-icon.recyclable {
    background-color: rgba(62, 213, 152, 0.15);
    color: var(--accent-primary);
}

.result-icon.residue {
    background-color: rgba(240, 168, 104, 0.15);
    color: var(--warning);
}

.result-badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 999px;
    margin-bottom: 4px;
}

.result-badge.recyclable {
    background-color: rgba(62, 213, 152, 0.15);
    color: var(--accent-primary);
}

.result-badge.residue {
    background-color: rgba(240, 168, 104, 0.15);
    color: var(--warning);
}

.result-card h2 {
    font-size: 22px;
    text-transform: capitalize;
}

.confidence-block {
    margin-bottom: 20px;
}

.confidence-bar {
    width: 100%;
    height: 12px;
    background-color: var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 8px;
}

.confidence-fill {
    height: 100%;
    width: 0%;
    background-color: var(--accent-secondary);
    transition: width 0.6s ease;
}

#confidenceText {
    font-size: 14px;
    color: var(--text-muted);
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 14px;
    margin-bottom: 20px;
}

.detail-item {
    background-color: var(--bg-alt);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 14px;
}

.detail-label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.detail-value {
    font-size: 14px;
    font-weight: 600;
}

.impact-box, .handling-box {
    margin-bottom: 20px;
}

.impact-box h4, .handling-box h4, .alt-predictions h4 {
    font-size: 15px;
    margin-bottom: 6px;
    color: var(--accent-secondary);
}

.impact-box p, .handling-box p {
    font-size: 14px;
    color: var(--text-muted);
}

.alt-predictions {
    margin-bottom: 16px;
}

.alt-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    font-size: 13px;
}

.alt-name {
    width: 110px;
    flex-shrink: 0;
    text-transform: capitalize;
    color: var(--text-muted);
}

.alt-bar-track {
    flex: 1;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 6px;
    overflow: hidden;
}

.alt-bar-fill {
    height: 100%;
    background-color: var(--accent-secondary);
}

.alt-percent {
    width: 42px;
    text-align: right;
    color: var(--text-muted);
}

.tech-details {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 16px;
    background-color: var(--bg-alt);
}

.tech-details summary {
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    color: var(--accent-secondary);
}

.tech-details ul {
    margin-top: 10px;
    padding-left: 18px;
    font-size: 13px;
    color: var(--text-muted);
}

.tech-details li {
    margin-bottom: 4px;
}

/* ===== Dataset & guide pages ===== */
.dataset-section, .guide-section {
    max-width: 850px;
    margin: 50px auto;
    padding: 0 20px;
}

.dataset-section h1, .guide-section h1 {
    font-size: 28px;
    margin-bottom: 16px;
}

.dataset-section h2, .guide-section h2 {
    font-size: 20px;
    margin: 32px 0 10px;
    color: var(--accent-secondary);
}

.info-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    margin: 20px 0;
}

.info-item {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 16px;
}

.info-item .icon {
    color: var(--accent-primary);
}

.info-item h4 {
    font-size: 14px;
    margin-bottom: 4px;
}

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

.graph-box {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 14px;
    box-shadow: var(--shadow);
}

.graph-box img {
    width: 100%;
    border-radius: 8px;
}

.graph-caption {
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 8px;
}

.graph-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 16px;
}

/* Guide steps */
.guide-steps {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 20px;
}

.guide-step {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: var(--shadow);
}

.step-number {
    width: 34px;
    height: 34px;
    flex-shrink: 0;
    background-color: var(--accent-primary);
    color: #0F1C15;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.guide-step h3 {
    font-size: 16px;
    margin-bottom: 4px;
}

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

.glossary-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-top: 16px;
}

.glossary-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 16px;
}

.glossary-item .icon {
    color: var(--accent-primary);
}

.glossary-item h4 {
    font-size: 15px;
    margin-bottom: 4px;
}

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

/* FAQ accordion */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 16px;
}

.faq-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 18px;
}

.faq-item summary {
    cursor: pointer;
    font-weight: 600;
    font-size: 15px;
}

.faq-item p {
    margin-top: 10px;
    font-size: 14px;
    color: var(--text-muted);
}

/* ===== Footer ===== */
.site-footer {
    padding: 30px 20px 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
    max-width: 1000px;
    margin: 0 auto 16px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-primary);
    font-weight: 700;
}

.footer-links {
    display: flex;
    list-style: none;
    gap: 18px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--accent-primary);
}

.footer-note {
    color: var(--text-muted);
    font-size: 13px;
}

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

/* ===== Responsive (mobile) ===== */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--bg-main);
        border-bottom: 1px solid var(--border-color);
        padding: 12px 24px;
        gap: 14px;
        display: none;
    }

    .nav-menu.active {
        display: flex;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}