/* ========================================
   HypotheSys™ Documentation Site
   Steve Jobs-inspired: Clean, Minimal, Premium
   ======================================== */

/* CSS Custom Properties */
:root {
    /* Colors - Light Mode */
    --color-bg: #ffffff;
    --color-bg-secondary: #f5f5f7;
    --color-bg-tertiary: #fbfbfd;
    --color-text-primary: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-text-tertiary: #86868b;
    --color-accent: #6e6e73;
    --color-accent-hover: #86868b;
    --color-btn-text: #ffffff;
    --color-border: rgba(0, 0, 0, 0.08);
    --color-card-bg: rgba(255, 255, 255, 0.8);
    --color-card-border: rgba(0, 0, 0, 0.04);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    --font-size-hero: clamp(2.5rem, 8vw, 5rem);

    /* 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;
    --space-4xl: 6rem;
    --space-section: clamp(4rem, 10vw, 8rem);

    /* Effects */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 24px 80px rgba(0, 0, 0, 0.16);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* No dark mode - always light theme */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    min-height: 100vh;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

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

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container--narrow {
    max-width: 800px;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.text-gradient {
    color: var(--color-text-secondary);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    background-color: rgba(255, 255, 255, 0.72);
    border-bottom: 1px solid var(--color-border);
}

/* Nav always light */

.nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
    padding-top: calc(env(safe-area-inset-top) + 0.75rem);
    padding-left: 1rem;
    padding-right: 1rem;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
}

.nav__logo:hover {
    color: var(--color-text-primary);
}

.nav__logo-icon {
    font-size: 1.5rem;
}

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

.nav__link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.nav__link:hover {
    color: var(--color-text-primary);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-4xl) var(--space-lg);
    position: relative;
    overflow: hidden;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    background: var(--color-bg-secondary);
    border-radius: 100px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    border: 1px solid var(--color-border);
}

.hero__badge-dot {
    width: 8px;
    height: 8px;
    background: #34c759;
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.6;
        transform: scale(1.1);
    }
}

.hero__title {
    font-size: var(--font-size-hero);
    font-weight: 700;
    letter-spacing: -0.04em;
    margin-bottom: var(--space-lg);
    line-height: 1;
}

.hero__subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-bottom: var(--space-2xl);
    line-height: 1.5;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    justify-content: center;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--radius-xl);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn--primary {
    background: rgba(120, 120, 128, 0.2);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: #1d1d1f;
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.btn--primary:hover {
    background: rgba(120, 120, 128, 0.32);
    color: #1d1d1f;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.btn--secondary {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: #1d1d1f;
    border: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.btn--secondary:hover {
    background: rgba(255, 255, 255, 0.8);
    color: #1d1d1f;
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.btn--large {
    padding: var(--space-lg) var(--space-2xl);
    font-size: var(--font-size-lg);
}

/* App Screenshots Carousel */
.screenshots {
    padding: var(--space-section) 0;
    background: var(--color-bg-secondary);
    overflow: hidden;
}

.screenshots__title {
    font-size: var(--font-size-3xl);
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.carousel {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.carousel__track {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    gap: var(--space-lg);
    padding: var(--space-md) 0;
    -ms-overflow-style: none;
    /* IE and Edge */
    scrollbar-width: none;
    /* Firefox */
}

.carousel__track::-webkit-scrollbar {
    display: none;
    /* Chrome, Safari, Opera */
}

.carousel__item {
    flex: 0 0 calc(100% - var(--space-xl));
    scroll-snap-align: center;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    background: var(--color-bg);
}

.carousel__item img {
    width: 100%;
    height: auto;
    display: block;
    cursor: pointer;
    transition: transform var(--transition-base);
}

.carousel__item img:hover {
    transform: scale(1.02);
}

/* Lightbox Overlay */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--space-2xl);
    cursor: pointer;
}

.lightbox.active {
    display: flex;
}

.lightbox__content {
    max-width: 95%;
    max-height: 90vh;
    border-radius: var(--radius-lg);
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
    cursor: default;
    animation: zoomIn 0.3s ease-out;
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.lightbox__close {
    position: absolute;
    top: var(--space-xl);
    right: var(--space-xl);
    background: none;
    border: none;
    color: #fff;
    font-size: 3rem;
    line-height: 1;
    cursor: pointer;
    transition: transform var(--transition-base);
}

.lightbox__close:hover {
    transform: scale(1.1);
}

@media (max-width: 768px) {
    .lightbox {
        padding: var(--space-md);
    }
}

.carousel__btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    z-index: 10;
}

.carousel__btn:hover {
    background: #fff;
    transform: translateY(-50%) scale(1.1);
    box-shadow: var(--shadow-lg);
}

.carousel__btn--prev {
    left: -22px;
}

.carousel__btn--next {
    right: -22px;
}

@media (max-width: 1024px) {
    .carousel__btn {
        display: none;
        /* Use native scroll on mobile/tablet */
    }

    .carousel__item {
        flex: 0 0 85%;
    }
}

/* Features Section */
.features {
    padding: var(--space-section) 0;
}

.features__header {
    text-align: center;
    margin-bottom: var(--space-4xl);
}

.features__label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-md);
}

.features__title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-lg);
}

.features__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    align-items: stretch;
}

.feature-card {
    padding: var(--space-2xl);
    background: var(--color-card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-card-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    height: 100%;
}

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

.feature-card__icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-lg);
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.feature-card__icon img {
    height: 100%;
    width: auto;
    object-fit: contain;
}

.feature-card__title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-sm);
}

.feature-card__description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.6;
    flex-grow: 1;
}

/* CTA Section */
.cta {
    padding: var(--space-section) 0;
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
    text-align: center;
}

.cta__title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-lg);
}

.cta__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2xl);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* Footer */
.footer {
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.footer__links {
    display: flex;
    gap: var(--space-xl);
}

.footer__link {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.footer__link:hover {
    color: var(--color-text-primary);
}

.footer__copyright {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

/* Downloads Page Specific */
.downloads-hero {
    padding: calc(52px + var(--space-4xl)) var(--space-lg) var(--space-4xl);
    text-align: center;
    background: var(--color-bg-secondary);
}

.downloads-hero__title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-md);
}

.downloads-hero__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

.platforms {
    padding: var(--space-4xl) 0;
}

.platforms__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-2xl);
    max-width: 900px;
    margin: 0 auto;
}

.platform-card {
    padding: var(--space-3xl);
    background: var(--color-card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-card-border);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-base);
}

.platform-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-border);
}


.platform-card__icon {
    width: 64px;
    height: 64px;
    margin: 0 auto;
    /* center on small screens */
    background: #f2f2f2;
    border-radius: 12px;

    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.65rem;
}

.platform-card__icon img {
    width: 28px;
    height: 28px;
}

.platform-card__name {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-sm);
}

.platform-card__version {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-xl);
}

.platform-card__info {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: var(--space-lg);
}

.release-note {
    padding: var(--space-2xl);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-4xl);
}

.release-note__title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-sm);
}

.release-note__text {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .nav__links {
        gap: var(--space-sm);
    }

    .nav__link {
        font-size: 0.8rem;
    }

    .hero__title {
        font-size: clamp(2rem, 10vw, 3.5rem);
    }

    .hero__subtitle {
        font-size: var(--font-size-base);
    }

    .hero__actions {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }

    .btn {
        width: 100%;
    }

    .features__title {
        font-size: var(--font-size-3xl);
    }

    .cta__title {
        font-size: var(--font-size-3xl);
    }

    .platforms__grid {
        grid-template-columns: 1fr;
        padding: 0 var(--space-lg);
    }
}

/* Utilities */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}