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

:root {
    --color-bg: #0f1219;
    --color-bg-light: #171c28;
    --color-bg-card: #1e2436;
    --color-surface: #252d40;
    --color-primary: #6c8aff;
    --color-primary-light: #8da4ff;
    --color-primary-dark: #4a6aef;
    --color-accent: #a78bfa;
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-text-dim: #64748b;
    --color-border: #2d3748;
    --color-white: #ffffff;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --max-width: 1120px;
    --radius: 12px;
    --radius-sm: 8px;
}

html {
    scroll-behavior: smooth;
}

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

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--color-white);
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(15, 18, 25, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-white);
    font-weight: 700;
    font-size: 1.15rem;
}

.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: 8px;
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--color-white);
}

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

.nav-links a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.mobile-menu {
    display: none;
    flex-direction: column;
    padding: 0 24px 16px;
    gap: 12px;
}

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

.mobile-menu a {
    color: var(--color-text-muted);
    font-size: 1rem;
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border);
}

/* ===== Hero ===== */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-light) 100%);
}

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

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--color-white), var(--color-primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 520px;
}

.hero-badges {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.badge-placeholder {
    display: inline-flex;
    align-items: center;
    padding: 12px 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 0.85rem;
    font-weight: 500;
}

/* Phone Mockup */
.hero-image {
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 280px;
    height: 560px;
    background: var(--color-bg);
    border-radius: 36px;
    border: 3px solid var(--color-border);
    padding: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    position: relative;
}

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 24px;
    background: var(--color-bg);
    border-radius: 0 0 16px 16px;
    border: 2px solid var(--color-border);
    border-top: none;
    z-index: 1;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--color-bg-light);
    border-radius: 24px;
    overflow: hidden;
}

.phone-screen img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    display: block;
}

/* ===== Section Common ===== */
.section-title {
    font-size: 2rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 12px;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 1.05rem;
    margin-bottom: 48px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Features ===== */
.features {
    padding: 96px 0;
    background: var(--color-bg-light);
}

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

.feature-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px 24px;
    transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    background: rgba(108, 138, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-white);
}

.feature-card p {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ===== How It Works ===== */
.how-it-works {
    padding: 96px 0;
    background: var(--color-bg);
}

.steps {
    max-width: 680px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
}

.steps::before {
    content: '';
    position: absolute;
    left: 27px;
    top: 28px;
    bottom: 28px;
    width: 2px;
    background: var(--color-border);
}

.step {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    padding: 20px 0;
}

.step-number {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: 50%;
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--color-white);
    position: relative;
    z-index: 1;
}

.step-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--color-white);
    padding-top: 4px;
}

.step-content p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ===== Screenshots ===== */
.screenshots {
    padding: 96px 0;
    background: var(--color-bg-light);
    overflow: hidden;
}

.screenshot-gallery {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.screenshot-item {
    flex: 0 0 200px;
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: transform 0.2s;
    text-align: center;
}

.screenshot-item:hover {
    transform: translateY(-6px);
}

.screenshot-item img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius) var(--radius) 0 0;
}

.screenshot-label {
    padding: 10px 0;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    letter-spacing: 0.02em;
}

/* ===== About ===== */
.about {
    padding: 96px 0;
    background: var(--color-bg);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.about-text p {
    color: var(--color-text-muted);
    font-size: 1rem;
    line-height: 1.75;
    margin-bottom: 16px;
}

.about-text strong {
    color: var(--color-text);
}

.about-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.detail-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
}

.detail-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-white);
}

.detail-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ===== Footer ===== */
.footer {
    background: var(--color-bg-light);
    border-top: 1px solid var(--color-border);
    padding-top: 48px;
}

.footer-inner {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-brand .logo-icon,
.footer-brand .logo-text {
    display: inline;
}

.footer-tagline {
    color: var(--color-text-dim);
    font-size: 0.88rem;
    line-height: 1.5;
    max-width: 280px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col h4 {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text);
    margin-bottom: 4px;
}

.footer-col a {
    color: var(--color-text-muted);
    font-size: 0.88rem;
}

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

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding: 20px 0;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--color-text-dim);
    text-align: center;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .screenshot-gallery {
        flex-wrap: wrap;
    }

    .screenshot-item {
        flex: 0 0 calc(33% - 14px);
    }

    .footer-inner {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-badges {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

    .phone-mockup {
        width: 220px;
        height: 440px;
    }

    .section-title {
        font-size: 1.7rem;
    }

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

    .about-content {
        grid-template-columns: 1fr;
    }

    .screenshot-item {
        flex: 0 0 calc(50% - 10px);
    }

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

/* ===== Page-specific styles for subpages ===== */
.page-header {
    padding: 120px 0 48px;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-light) 100%);
}

.page-header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 8px;
}

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

.page-content {
    padding: 48px 0 96px;
    background: var(--color-bg-light);
}

.page-content .content-body {
    max-width: 760px;
    margin: 0 auto;
}

.page-content h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-top: 40px;
    margin-bottom: 12px;
    color: var(--color-white);
}

.page-content h2:first-child {
    margin-top: 0;
}

.page-content p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.75;
    margin-bottom: 12px;
}

.page-content ul {
    list-style: none;
    padding: 0;
    margin-bottom: 16px;
}

.page-content ul li {
    position: relative;
    padding-left: 20px;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.75;
    margin-bottom: 4px;
}

.page-content ul li::before {
    content: '\2022';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.page-content strong {
    color: var(--color-text);
}

/* Support page cards */
.support-cards {
    display: grid;
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto 48px;
    gap: 24px;
}

.support-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px 28px;
    text-align: center;
}

.support-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-white);
}

.support-card p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.support-card a.button {
    display: inline-block;
    padding: 10px 24px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.support-card a.button:hover {
    background: var(--color-primary-dark);
}

@media (max-width: 768px) {
    .support-cards {
        grid-template-columns: 1fr;
    }
}