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

:root {
    --primary: #a3e635;
    --primary-dark: #84cc16;
    --accent-orange: #fb923c;
    --accent-red: #ef4444;
    --accent-yellow: #fbbf24;
    --secondary: #f97316;
    --background: #0a0a0a;
    --surface: #1a1a1a;
    --surface-light: #2a2a2a;
    --text: #ffffff;
    --text-secondary: #a0a0a0;
    --success: #84cc16;
    --border: #333333;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 22%;
    overflow: hidden;
}

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

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent-yellow), var(--accent-orange));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: 2rem;
}

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

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Hero Section */
.hero {
    padding: 10rem 0 6rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(163, 230, 53, 0.15) 0%, rgba(251, 146, 60, 0.1) 50%, transparent 70%);
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--accent-yellow), var(--accent-orange), var(--accent-red));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent-yellow));
    color: var(--background);
    box-shadow: 0 4px 20px rgba(163, 230, 53, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(163, 230, 53, 0.5);
}

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

.btn-secondary:hover {
    border-color: var(--primary);
    background: var(--surface-light);
}

.btn-large {
    padding: 1.25rem 3rem;
    font-size: 1.1rem;
}

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

.phone-mockup {
    width: 300px;
    height: 600px;
    background: linear-gradient(145deg, #1a1a1a, #0f0f0f);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    position: relative;
}

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 25px;
    background: #0a0a0a;
    border-radius: 0 0 20px 20px;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: #000;
    border-radius: 32px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tuner-display {
    text-align: center;
    padding: 2rem;
}

.note-display {
    font-size: 5rem;
    font-weight: 800;
    color: var(--primary);
    text-shadow: 0 0 30px var(--primary);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }
}

.frequency {
    font-size: 1.2rem;
    color: var(--accent-orange);
    margin: 1rem 0;
}

.cents-meter {
    width: 200px;
    height: 40px;
    background: var(--surface);
    border-radius: 20px;
    margin: 1.5rem auto;
    position: relative;
    overflow: hidden;
}

.meter-bar {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 2px;
    height: 100%;
    background: var(--text-secondary);
}

.meter-needle {
    position: absolute;
    top: 0;
    left: 50%;
    width: 4px;
    height: 100%;
    background: var(--primary);
    box-shadow: 0 0 10px var(--primary);
    animation: sway 3s ease-in-out infinite;
}

@keyframes sway {

    0%,
    100% {
        transform: translateX(-50%);
    }

    50% {
        transform: translateX(-30px);
    }
}

.cents-text {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Features Section */
.features {
    padding: 6rem 0;
    background: var(--surface);
}

.section-title {
    font-size: 3rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 4rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--background);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 10px 40px rgba(163, 230, 53, 0.15);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

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

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Tutorial Section */
.tutorial {
    padding: 6rem 0;
}

.tutorial-steps {
    max-width: 800px;
    margin: 0 auto 4rem;
}

.step {
    display: flex;
    gap: 2rem;
    margin-bottom: 3rem;
    position: relative;
}

.step::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 70px;
    width: 2px;
    height: calc(100% + 1rem);
    background: linear-gradient(to bottom, var(--primary), transparent);
}

.step:last-child::before {
    display: none;
}

.step-number {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--accent-yellow), var(--accent-orange));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--background);
    box-shadow: 0 4px 20px rgba(163, 230, 53, 0.3);
}

.step-content h3 {
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.step-content p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.tips-box {
    background: var(--surface);
    padding: 2rem;
    border-radius: 20px;
    border-left: 4px solid var(--primary);
    max-width: 800px;
    margin: 0 auto;
}

.tips-box h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text);
}

.tips-box ul {
    list-style: none;
    padding: 0;
}

.tips-box li {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.8;
}

.tips-box li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

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

/* FAQ Section */
.faq {
    padding: 6rem 0;
    background: var(--surface);
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--background);
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: border-color 0.3s ease;
}

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

.faq-question {
    width: 100%;
    padding: 1.5rem;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.125rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color 0.3s ease;
}

.faq-question:hover {
    color: var(--primary);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--primary);
    transition: transform 0.3s ease;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0 1.5rem;
}

.faq-item.active .faq-answer {
    max-height: 1000px;
    padding: 0 1.5rem 1.5rem;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.faq-answer p:last-child {
    margin-bottom: 0;
}

.faq-answer ul {
    list-style: none;
    padding-left: 0;
}

.faq-answer li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.8;
}

.faq-answer li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

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

/* Support Section */
.support {
    padding: 6rem 0;
}

.support-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.25rem;
    margin-bottom: 4rem;
}

.support-content {
    display: grid;
    /* grid-template-columns: 1fr 1fr; */
    gap: 4rem;
    max-width: 1100px;
    margin: 0 auto;
}

.support-form {
    background: var(--surface);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid var(--border);
}

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

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-group textarea {
    resize: vertical;
}

.support-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.info-card {
    background: var(--surface);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.info-card:hover {
    border-color: var(--primary);
    transform: translateX(5px);
}

.info-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.info-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.info-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 0.5rem;
}

.email-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.email-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Footer */
.footer {
    background: var(--surface);
    padding: 3rem 0;
    border-top: 1px solid var(--border);
}

.footer-content {
    text-align: center;
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.footer-text {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.footer-copyright {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-visual {
        order: -1;
    }

    .hero-title {
        font-size: 3rem;
    }

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

    .nav {
        gap: 1rem;
    }

    .nav-link {
        font-size: 0.875rem;
    }

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

    .phone-mockup {
        width: 250px;
        height: 500px;
    }

    .note-display {
        font-size: 4rem;
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0 1rem;
    }

    .hero {
        padding: 8rem 0 4rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .step {
        flex-direction: column;
        gap: 1rem;
    }

    .step::before {
        display: none;
    }

    .nav {
        display: none;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}