/* base — Premium Productivity App Landing Page */

:root {
    --color-bg: #0a0a0a;
    --color-bg-elevated: #111111;
    --color-bg-card: #161616;
    --color-text: #ffffff;
    --color-text-secondary: #888888;
    --color-text-tertiary: #555555;
    --color-accent: #ffffff;
    --color-border: #222222;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition-fast: 0.15s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.5rem 2rem;
    background: linear-gradient(to bottom, var(--color-bg) 0%, transparent 100%);
    transition: background var(--transition-medium);
}

nav.scrolled {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

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

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.nav-cta {
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.625rem 1.25rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    transition: all var(--transition-fast);
}

.nav-cta:hover {
    background: var(--color-text);
    color: var(--color-bg);
    border-color: var(--color-text);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 2rem 4rem;
    text-align: center;
}

.hero-content {
    max-width: 720px;
}

.hero h1 {
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 600;
    letter-spacing: -0.04em;
    line-height: 1.05;
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease forwards;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 3rem;
    font-weight: 400;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease 0.1s forwards;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease 0.2s forwards;
}

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    padding: 1rem 1.75rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--color-text);
    color: var(--color-bg);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(255, 255, 255, 0.15);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

.btn-secondary:hover {
    border-color: var(--color-text-secondary);
    background: var(--color-bg-elevated);
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
}

.hero-price {
    font-size: 0.9375rem;
    color: var(--color-text-tertiary);
    letter-spacing: 0.02em;
    opacity: 0;
    animation: fadeIn 0.8s ease 0.4s forwards;
}

/* Story Section */
.story {
    padding: 8rem 2rem;
    background: var(--color-bg-elevated);
}

.story-container {
    max-width: 720px;
    margin: 0 auto;
}

.story-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin-bottom: 2rem;
}

.story h2 {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 500;
    letter-spacing: -0.02em;
    line-height: 1.3;
    margin-bottom: 3rem;
    color: var(--color-text);
}

.story-content p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
}

.story-content p:last-child {
    color: var(--color-text);
    font-weight: 500;
}

.story-signature {
    margin-top: 3rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.signature-line {
    width: 60px;
    height: 1px;
    background: var(--color-border);
}

.signature-text {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    font-style: italic;
}

/* Features Section */
.features {
    padding: 8rem 2rem;
}

.features-container {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
}

@media (max-width: 768px) {
    .features-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
}

.feature h3 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: 0.75rem;
}

.feature p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Pricing Section */
.pricing {
    padding: 8rem 2rem;
    background: var(--color-bg-elevated);
}

.pricing-container {
    max-width: 480px;
    margin: 0 auto;
    text-align: center;
}

.pricing-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 3rem;
    margin-bottom: 2rem;
}

.pricing-header {
    margin-bottom: 2rem;
}

.pricing-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin-bottom: 1rem;
}

.pricing-amount {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.price {
    font-size: 3.5rem;
    font-weight: 600;
    letter-spacing: -0.03em;
}

.price-note {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

.pricing-features {
    list-style: none;
    text-align: left;
    margin-bottom: 2rem;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features svg {
    flex-shrink: 0;
    color: var(--color-text);
}

.pricing-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 1.125rem;
    background: var(--color-text);
    color: var(--color-bg);
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.pricing-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(255, 255, 255, 0.15);
}

.pricing-note {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    font-style: italic;
}

/* Final CTA Section */
.final-cta {
    padding: 10rem 2rem;
    text-align: center;
}

.final-cta-container {
    max-width: 600px;
    margin: 0 auto;
}

.final-cta h2 {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 2.5rem;
}

/* Footer */
footer {
    padding: 4rem 2rem;
    border-top: 1px solid var(--color-border);
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.footer-logo {
    font-size: 1.125rem;
    font-weight: 600;
}

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

.footer-links {
    margin-bottom: 3rem;
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-copyright {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.footer-no-android {
    font-size: 0.6875rem;
    color: var(--color-text-tertiary);
    opacity: 0.6;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Scroll Reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 640px) {
    nav {
        padding: 1rem 1.5rem;
    }

    .hero {
        padding: 6rem 1.5rem 3rem;
    }

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

    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }

    .story,
    .features,
    .pricing,
    .final-cta {
        padding: 5rem 1.5rem;
    }

    .pricing-card {
        padding: 2rem;
    }

    .footer-brand {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

/* Selection */
::selection {
    background: rgba(255, 255, 255, 0.2);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}