/* Zero Forwarder Landing Page - Main Stylesheet */
:root {
    /* Colors - Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc; /* Slate 50 */
    --bg-tertiary: #f1f5f9;  /* Slate 100 */
    --bg-backdrop: rgba(255, 255, 255, 0.9);

    --accent-primary: #0ea5e9;   /* Sky 500 */
    --accent-secondary: #06b6d4; /* Cyan 500 */
    --accent-hover: #0284c7;     /* Sky 600 */

    --text-primary: #1e293b;   /* Slate 800 */
    --text-secondary: #64748b; /* Slate 500 */
    --text-muted: #94a3b8;     /* Slate 400 */
    --text-inverted: #ffffff;

    --border-color: #e2e8f0;   /* Slate 200 */
    --border-hover: #cbd5e1;   /* Slate 300 */

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-primary: 0 4px 14px rgba(14, 165, 233, 0.25);
    --shadow-glow: 0 0 20px rgba(14, 165, 233, 0.35);

    /* Fonts */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Typography Scale */
    --h1: clamp(2.5rem, 5vw, 4rem);
    --h2: clamp(2rem, 4vw, 3rem);
    --h3: clamp(1.5rem, 3vw, 2.25rem);
    --h4: clamp(1.25rem, 2vw, 1.75rem);
    --h5: 1.25rem;
    --h6: 1rem;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Responsive Breakpoints (reference only) */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ===== Section Scroll Anchors ===== */
#features {
    scroll-margin-top: 80px;
}

#pricing {
    scroll-margin-top: 80px;
}

#testimonials {
    scroll-margin-top: 80px;
}

#faq {
    scroll-margin-top: 80px;
}

#install {
    scroll-margin-top: 80px;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-backdrop);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
}

.logo-icon {
    width: 2rem;
    height: 2rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 1.2rem;
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--accent-primary);
}

.cta-btn {
    background: var(--accent-primary);
    color: white;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    white-space: nowrap;
}

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

/* Hamburger Menu */
.hamburger-menu {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1002;
    padding: 0;
    min-width: 44px;
    min-height: 44px;
    align-items: center;
}

.hamburger-menu .bar {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100svh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
}

.particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 80%, rgba(14, 165, 233, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(14, 165, 233, 0.05) 0%, transparent 50%);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

.hero-content {
    max-width: 800px;
    padding: var(--space-2xl) var(--space-md);
    z-index: 1;
}

.hero-title {
    font-size: var(--h1);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-lg);
    background: linear-gradient(135deg, var(--text-primary), var(--accent-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: var(--space-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    padding: var(--space-md) var(--space-2xl);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    color: var(--accent-primary);
    padding: var(--space-md) var(--space-2xl);
    border: 2px solid var(--border-color);
    background: white;
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    background: var(--bg-secondary);
    color: var(--accent-primary);
    transform: translateY(-3px);
}

/* ===== Section Common ===== */
.section-title {
    font-size: var(--h2);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-3xl);
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--space-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Features Section ===== */
.features {
    padding: var(--space-3xl) 0;
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-primary);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 3rem;
    height: 3rem;
    color: var(--accent-primary);
    margin-bottom: var(--space-lg);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-title {
    font-size: var(--h4);
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Pricing Section ===== */
.pricing {
    padding: var(--space-3xl) 0;
    background: var(--bg-secondary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--bg-primary);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: var(--shadow-md);
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

.pricing-card.popular {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-primary);
}

.popular-tag {
    position: absolute;
    top: 12px;
    right: 12px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
}

.pricing-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.pricing-price {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-xl);
    color: var(--text-primary);
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.pricing-period {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--space-2xl);
    flex-grow: 1;
}

.pricing-features li {
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.pricing-features li::before {
    content: "✓";
    color: var(--accent-primary);
    font-weight: bold;
    flex-shrink: 0;
}

.full-width {
    width: 100%;
    justify-content: center;
}

/* ===== Testimonials Section ===== */
.testimonials {
    padding: var(--space-3xl) 0;
    background: var(--bg-primary);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.testimonial-card {
    background: var(--bg-primary);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-hover);
}

.testimonial-quote {
    font-size: 2rem;
    color: var(--accent-primary);
    line-height: 1;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.testimonial-content {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: var(--space-xl);
    line-height: 1.6;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.avatar {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1rem;
    flex-shrink: 0;
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-weight: 600;
    color: var(--text-primary);
}

.author-company {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ===== FAQ Section ===== */
.faq {
    padding: var(--space-3xl) 0;
    background: var(--bg-secondary);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: var(--accent-primary);
}

.faq-item.active {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-primary);
}

.faq-question {
    padding: var(--space-lg);
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    min-height: 44px;
}

.faq-toggle {
    font-size: 1.5rem;
    color: var(--accent-primary);
    transition: transform 0.3s ease;
    line-height: 1;
    flex-shrink: 0;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    transition: max-height 0.4s ease-in-out;
}

.answer-content {
    padding: 0 var(--space-lg) var(--space-lg);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Install Section ===== */
.install {
    padding: var(--space-3xl) 0;
    background: var(--bg-primary);
}

.terminal {
    max-width: 800px;
    margin: var(--space-2xl) auto 0;
    background: #1e293b;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.terminal-header {
    background: #0f172a;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.terminal-controls {
    display: flex;
    gap: var(--space-sm);
}

.control {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.close { background: #ff5f56; }
.minimize { background: #ffbd2e; }
.maximize { background: #27ca3f; }

.terminal-title {
    font-size: 0.9rem;
    color: #94a3b8;
    font-weight: 500;
}

.terminal-body {
    padding: var(--space-lg);
    overflow-x: auto;
}

.command-line {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-family: var(--font-mono);
    font-size: 1rem;
    white-space: nowrap;
}

.command-line + .command-line {
    margin-top: var(--space-md);
}

.prompt {
    color: var(--accent-primary);
    font-weight: 600;
    flex-shrink: 0;
}

.command {
    color: #f8fafc;
    flex: 1;
}

.copy-btn {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    flex-shrink: 0;
    min-height: 44px;
    min-width: 44px;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.copy-btn.copied {
    background: rgba(39, 202, 63, 0.2);
    color: #27ca3f;
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--space-2xl) 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-lg);
}

.footer-brand h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
}

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

.footer-bottom {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===== Mobile Responsive (< 768px) ===== */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--space-md);
    }

    /* Show hamburger on mobile */
    .hamburger-menu {
        display: flex;
    }

    /* Nav slide-in panel */
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--space-xl);
        transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 1001;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }

    .nav-links.active {
        right: 0;
    }

    /* Hamburger active animation */
    .hamburger-menu.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .hamburger-menu.active .bar:nth-child(2) {
        opacity: 0;
    }
    .hamburger-menu.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .nav-link {
        font-size: 1.5rem;
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    /* Hero */
    .hero-content {
        padding: var(--space-xl) var(--space-md);
    }

    .hero-description {
        font-size: 1.1rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 280px;
        justify-content: center;
        min-height: 44px;
    }

    /* Features */
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    /* Pricing */
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    /* Testimonials */
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    /* FAQ touch targets */
    .faq-question {
        padding: var(--space-lg);
        min-height: 44px;
    }

    /* Terminal overflow on mobile */
    .terminal-body {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .command-line {
        flex-wrap: nowrap;
        min-width: max-content;
    }

    .copy-btn {
        margin-top: var(--space-sm);
    }

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

    .footer-links {
        justify-content: center;
    }

    /* Reduced padding on sections */
    .features,
    .pricing,
    .testimonials,
    .faq,
    .install {
        padding: var(--space-2xl) 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }

    .feature-card,
    .pricing-card,
    .testimonial-card {
        padding: var(--space-lg);
    }

    .terminal {
        margin: var(--space-lg) auto 0;
        border-radius: var(--radius-lg);
    }

    .command-line {
        font-size: 0.85rem;
    }

    .section-title {
        font-size: 2rem;
        margin-bottom: var(--space-2xl);
    }
}

/* ===== Accessibility: Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .particles {
        animation: none;
    }

    html {
        scroll-behavior: auto;
    }
}