/* ============================================
   SPK TOPSIS - Download Website
   Modern, Clean, Smooth
   ============================================ */

:root {
    --primary: #4f6ef7;
    --primary-dark: #3b5bdb;
    --primary-light: #dbe4ff;
    --accent: #7c3aed;
    --gradient: linear-gradient(135deg, #4f6ef7 0%, #7c3aed 100%);
    --gradient-soft: linear-gradient(135deg, rgba(79,110,247,0.1) 0%, rgba(124,58,237,0.1) 100%);
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
    --radius: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    background: var(--surface);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   Background Animation
   ============================================ */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.04;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 600px;
    height: 600px;
    background: var(--primary);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.shape-2 {
    width: 400px;
    height: 400px;
    background: var(--accent);
    bottom: -100px;
    left: -100px;
    animation-delay: -5s;
}

.shape-3 {
    width: 300px;
    height: 300px;
    background: var(--primary);
    top: 50%;
    left: 50%;
    animation-delay: -10s;
}

.shape-4 {
    width: 200px;
    height: 200px;
    background: var(--accent);
    top: 30%;
    right: 10%;
    animation-delay: -15s;
}

.shape-5 {
    width: 250px;
    height: 250px;
    background: var(--primary);
    bottom: 20%;
    left: 20%;
    animation-delay: -8s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(15px, 15px) scale(1.02); }
}

/* ============================================
   Navbar
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: rgba(255,255,255,0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    padding: 10px 0;
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 800;
    font-size: 1.2rem;
}

.nav-logo i {
    font-size: 1.4rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.btn-nav-download {
    background: var(--gradient) !important;
    color: #fff !important;
    padding: 8px 20px !important;
    border-radius: 8px;
    font-weight: 600 !important;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(79,110,247,0.3);
}

.btn-nav-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79,110,247,0.4);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.3rem;
    color: var(--text);
    cursor: pointer;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    z-index: 1;
    padding: 140px 0 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.badge-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--gradient-soft);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero-text h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 520px;
}

.hero-stats {
    display: flex;
    gap: 32px;
    margin-bottom: 32px;
}

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

.stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 4px 16px rgba(79,110,247,0.35);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(79,110,247,0.45);
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 2px solid var(--border);
}

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

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
}

.hero-meta {
    display: flex;
    gap: 20px;
    font-size: 0.82rem;
    color: var(--text-muted);
    font-weight: 500;
}

.hero-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* App Mockup */
.hero-visual {
    display: flex;
    justify-content: center;
}

.app-mockup {
    width: 100%;
    max-width: 480px;
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--border);
    animation: mockupFloat 6s ease-in-out infinite;
}

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

.mockup-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: #f1f5f9;
    border-bottom: 1px solid var(--border);
}

.mockup-dots {
    display: flex;
    gap: 6px;
}

.mockup-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #e2e8f0;
}

.mockup-dots span:first-child { background: #f87171; }
.mockup-dots span:nth-child(2) { background: #fbbf24; }
.mockup-dots span:last-child { background: #34d399; }

.mockup-title {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 500;
}

.mockup-body {
    display: flex;
    min-height: 280px;
}

.mockup-sidebar {
    width: 48px;
    background: #f8fafc;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px 0;
    gap: 8px;
}

.mock-nav-item {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: var(--text-muted);
    transition: var(--transition);
}

.mock-nav-item.active {
    background: var(--primary-light);
    color: var(--primary);
}

.mockup-content {
    flex: 1;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mock-card {
    background: var(--surface-2);
    border-radius: 10px;
    padding: 14px;
    border: 1px solid var(--border);
}

.mock-title {
    width: 60%;
    height: 10px;
    background: #e2e8f0;
    border-radius: 4px;
    margin-bottom: 14px;
}

.mock-chart {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    height: 80px;
}

.mock-bar {
    flex: 1;
    border-radius: 4px 4px 0 0;
    background: var(--gradient);
    opacity: 0.7;
    animation: barGrow 2s ease-out forwards;
    transform-origin: bottom;
}

@keyframes barGrow {
    from { transform: scaleY(0); }
    to { transform: scaleY(1); }
}

.mock-table {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.mock-row {
    height: 12px;
    background: #f1f5f9;
    border-radius: 4px;
}

.mock-row:nth-child(2) { width: 85%; }
.mock-row:nth-child(3) { width: 70%; }

/* ============================================
   Sections Common
   ============================================ */
section {
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

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

/* ============================================
   Features
   ============================================ */
.features {
    padding: 100px 0;
    background: var(--surface-2);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 28px 24px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--gradient-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--primary);
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   Screenshots
   ============================================ */
.screenshots {
    padding: 100px 0;
}

.screenshots-showcase {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.screenshot-card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
    background: var(--surface);
}

.screenshot-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.screenshot-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    object-position: top left;
    display: block;
    transition: var(--transition);
}

.screenshot-card:hover .screenshot-img {
    transform: scale(1.03);
}

.screenshot-placeholder {
    height: 220px;
    background: var(--gradient-soft);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--primary);
}

.screenshot-placeholder i {
    font-size: 2.5rem;
    opacity: 0.6;
}

.screenshot-placeholder span {
    font-weight: 600;
    font-size: 0.9rem;
}

.screenshot-label {
    padding: 16px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: center;
    background: var(--surface);
}

/* ============================================
   Criteria
   ============================================ */
.criteria {
    padding: 100px 0;
    background: var(--surface-2);
}

.criteria-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.criteria-item {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--surface);
    padding: 18px 20px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.criteria-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.criteria-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.criteria-icon.benefit {
    background: rgba(34,197,94,0.1);
    color: #22c55e;
}

.criteria-icon.cost {
    background: rgba(239,68,68,0.1);
    color: #ef4444;
}

.criteria-info h4 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.criteria-type {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.criteria-type.benefit {
    background: rgba(34,197,94,0.1);
    color: #22c55e;
}

.criteria-type.cost {
    background: rgba(239,68,68,0.1);
    color: #ef4444;
}

.criteria-weight {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: 8px;
}

/* ============================================
   Tech Stack
   ============================================ */
.tech {
    padding: 100px 0;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 28px 20px;
    background: var(--surface-2);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.tech-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.tech-item i {
    font-size: 2rem;
    color: var(--primary);
}

.tech-item span {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text);
}

/* ============================================
   Download Section
   ============================================ */
.download {
    padding: 100px 0;
    background: var(--surface-2);
}

.download-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    background: var(--surface);
    border-radius: var(--radius-xl);
    padding: 56px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
}

.download-info h2 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.download-info p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.7;
}

.download-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.detail-item i {
    color: #22c55e;
    font-size: 0.9rem;
}

.download-action {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.version-badge {
    background: var(--gradient-soft);
    color: var(--primary);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
}

.btn-download {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--gradient);
    color: #fff;
    padding: 18px 36px;
    border-radius: 14px;
    text-decoration: none;
    font-size: 1rem;
    transition: var(--transition);
    box-shadow: 0 8px 24px rgba(79,110,247,0.35);
}

.btn-download:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 12px 32px rgba(79,110,247,0.45);
}

.btn-download i {
    font-size: 1.8rem;
}

.dl-label {
    display: block;
    font-size: 0.75rem;
    opacity: 0.8;
    font-weight: 400;
}

.dl-platform {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
}

.download-note {
    font-size: 0.78rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.download-note i {
    color: #22c55e;
}

.download-counter {
    font-size: 0.82rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    position: relative;
    z-index: 1;
    padding: 60px 0 24px;
    background: #0f172a;
    color: #cbd5e1;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    color: #fff;
    font-size: 1.2rem;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    color: #94a3b8;
}

.footer-links h4 {
    color: #fff;
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    color: #94a3b8;
    text-decoration: none;
    font-size: 0.85rem;
    margin-bottom: 10px;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 20px;
    text-align: center;
    font-size: 0.82rem;
    color: #64748b;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .hero-text h1 {
        font-size: 2.5rem;
    }
    .hero-visual {
        order: -1;
    }
    .app-mockup {
        max-width: 400px;
    }
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .criteria-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .tech-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .download-card {
        grid-template-columns: 1fr;
        padding: 36px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--surface);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
    }
    .nav-links.active {
        display: flex;
    }
    .nav-toggle {
        display: block;
    }
    .hero {
        padding: 120px 0 60px;
        min-height: auto;
    }
    .hero-text h1 {
        font-size: 2rem;
    }
    .hero-stats {
        gap: 20px;
    }
    .stat-number {
        font-size: 1.4rem;
    }
    .hero-actions {
        flex-direction: column;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .screenshots-showcase {
        grid-template-columns: 1fr;
    }
    .criteria-grid {
        grid-template-columns: 1fr;
    }
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .download-details {
        grid-template-columns: 1fr;
    }
    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .section-header h2 {
        font-size: 1.7rem;
    }
}

@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 1.7rem;
    }
    .hero-meta {
        flex-direction: column;
        gap: 8px;
    }
    .download-card {
        padding: 24px;
    }
    .btn-download {
        padding: 14px 24px;
    }
}

/* ============================================
   Scroll Animations
   ============================================ */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}