/**
 * Landing Page Styles
 * Velumi - AI-Powered Story Creation
 *
 * Mobile-first responsive design
 * Breakpoints: 375px (mobile), 768px (tablet), 1024px+ (desktop)
 */

/* ===== Global Styles ===== */
body {
    font-family: var(--font-primary);
    color: var(--color-text-primary);
    background-color: var(--color-background);
    overflow-x: hidden;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-xl);
    }
}

/* Section Utilities */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-tight);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: var(--line-height-normal);
}

/* ===== Header / Navigation ===== */
.header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: var(--z-index-sticky);
    transition: box-shadow var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-sm);
}

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

.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav__logo-image {
    width: 32px;
    height: 32px;
}

.nav__logo-text {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
}

/* Mobile Menu Toggle */
.nav__toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 28px;
    height: 28px;
    padding: 4px;
    z-index: var(--z-index-modal);
}

.nav__toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-dark);
    border-radius: 2px;
    transition: var(--transition-base);
}

.nav__toggle.active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

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

.nav__toggle.active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* Navigation Menu */
.nav__menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-background);
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.nav__menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.nav__menu li {
    margin-bottom: var(--spacing-md);
}

.nav__link {
    display: block;
    padding: var(--spacing-sm);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    transition: color var(--transition-fast);
}

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

.nav__link--cta {
    display: inline-block;
    background-color: var(--color-primary);
    color: var(--color-text-on-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-semibold);
    transition: background-color var(--transition-fast);
}

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

/* Desktop Navigation */
@media (min-width: 768px) {
    .nav__toggle {
        display: none;
    }

    .nav__menu {
        position: static;
        display: flex;
        align-items: center;
        gap: var(--spacing-lg);
        padding: 0;
        background: transparent;
        border: none;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
    }

    .nav__menu li {
        margin-bottom: 0;
    }
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: var(--button-padding-y) var(--button-padding-x);
    font-size: var(--font-size-base);
    font-weight: var(--button-font-weight);
    text-align: center;
    border-radius: var(--button-border-radius);
    transition: all var(--transition-fast);
    cursor: pointer;
    line-height: 1.5;
    text-decoration: none;
}

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

.btn--primary:hover {
    background-color: var(--color-hover);
    border-color: var(--color-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn--secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-text-on-primary);
}

.btn--outline {
    background-color: transparent;
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
}

.btn--outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

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

.btn--full {
    width: 100%;
}

/* ===== Hero Section ===== */
.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, #FCF6B1 0%, #A9E5BB 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: rgba(237, 30, 46, 0.05);
    border-radius: 50%;
    z-index: 0;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero__content {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.hero__title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    margin-bottom: var(--spacing-lg);
    line-height: var(--line-height-tight);
}

.hero__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    line-height: var(--line-height-relaxed);
}

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

.hero__visual {
    display: flex;
    justify-content: center;
}

.phone-frame {
    position: relative;
    width: 280px;
    height: 560px;
    background: var(--color-dark);
    border-radius: 32px;
    padding: 12px;
    box-shadow: var(--shadow-xl);
}

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

.phone-screenshot {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Hero Desktop */
@media (min-width: 768px) {
    .hero {
        padding: var(--spacing-3xl) 0;
    }

    .hero .container {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-3xl);
        align-items: center;
    }

    .hero__content {
        text-align: left;
        margin-bottom: 0;
    }

    .hero__title {
        font-size: var(--font-size-4xl);
    }

    .hero__subtitle {
        margin-left: 0;
        margin-right: 0;
    }

    .hero__cta {
        flex-direction: row;
        align-items: flex-start;
        gap: var(--spacing-lg);
    }

    .phone-frame {
        width: 320px;
        height: 640px;
    }
}

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

.features__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

@media (min-width: 768px) {
    .features__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .features__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-card {
    padding: var(--spacing-xl);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

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

.feature-card__icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.feature-card__icon--primary {
    background-color: rgba(237, 30, 46, 0.1);
    color: var(--color-primary);
}

.feature-card__icon--secondary {
    background-color: rgba(169, 229, 187, 0.3);
    color: #2D8B57;
}

.feature-card__icon--accent {
    background-color: rgba(247, 179, 43, 0.2);
    color: #D89B1F;
}

.feature-card__title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
}

.feature-card__description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ===== How It Works Section ===== */
.how-it-works {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, #FFFFFF 0%, #F8F9FA 100%);
}

.steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3xl);
}

.step {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    position: relative;
}

.step__number {
    position: absolute;
    top: 0;
    left: 0;
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-text-on-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    box-shadow: var(--shadow-md);
}

.step__content {
    padding-top: var(--spacing-3xl);
}

.step__title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
}

.step__description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

.step__visual {
    display: flex;
    justify-content: center;
}

.step__image-placeholder {
    width: 100%;
    max-width: 300px;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.step__image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Desktop Steps Layout */
@media (min-width: 768px) {
    .step {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-3xl);
    }

    .step--reverse {
        direction: rtl;
    }

    .step--reverse .step__content {
        direction: ltr;
    }

    .step__number {
        top: var(--spacing-lg);
        left: var(--spacing-lg);
    }

    .step--reverse .step__number {
        left: auto;
        right: var(--spacing-lg);
    }
}

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

.pricing__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    max-width: 900px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .pricing__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.pricing-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    position: relative;
    transition: all var(--transition-base);
}

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

.pricing-card--featured {
    background: linear-gradient(135deg, #FCF6B1 0%, #FFFFFF 100%);
    border-color: var(--color-primary);
    border-width: 3px;
}

.pricing-card__badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-primary);
    color: var(--color-text-on-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
}

.pricing-card__header {
    text-align: center;
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-xl);
}

.pricing-card__title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
}

.pricing-card__price {
    margin-bottom: var(--spacing-sm);
}

.pricing-card__amount {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.pricing-card__period {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

.pricing-card__description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

.pricing-card__features {
    margin-bottom: var(--spacing-xl);
}

.pricing-card__feature {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
}

.pricing-card__feature--disabled {
    color: var(--color-text-secondary);
    opacity: 0.6;
}

.pricing-card__check {
    flex-shrink: 0;
    color: var(--color-success);
}

.pricing-card__cross {
    flex-shrink: 0;
    color: var(--color-text-secondary);
}

.pricing__note {
    text-align: center;
    margin-top: var(--spacing-xl);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* ===== Download Section ===== */
.download {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, #ED1E2E 0%, #D11A27 100%);
    color: var(--color-text-on-primary);
}

.download__content {
    text-align: center;
}

.download__title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
}

.download__subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.download__buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-3xl);
}

.download__app-store {
    display: inline-block;
    transition: transform var(--transition-fast);
}

.download__app-store:hover {
    transform: scale(1.05);
}

.download__stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    max-width: 600px;
    margin: 0 auto;
}

.download__stat {
    text-align: center;
}

.download__stat-number {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-xs);
}

.download__stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

/* ===== Footer ===== */
.footer {
    background-color: var(--color-dark);
    color: rgba(255, 255, 255, 0.9);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer__content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

@media (min-width: 768px) {
    .footer__content {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

.footer__section {
    /* Auto layout */
}

.footer__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.footer__logo-image {
    width: 40px;
    height: 40px;
}

.footer__logo-text {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.footer__description {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    opacity: 0.8;
    max-width: 300px;
}

.footer__title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer__link {
    font-size: var(--font-size-base);
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.footer__link:hover {
    opacity: 1;
    color: var(--color-secondary);
}

.footer__social {
    display: flex;
    gap: var(--spacing-md);
}

.footer__social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.footer__social-link:hover {
    background: var(--color-primary);
    transform: translateY(-2px);
}

.footer__bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer__copyright {
    font-size: var(--font-size-sm);
    opacity: 0.7;
}

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

/* Smooth scroll offset for fixed header */
html {
    scroll-padding-top: 80px;
}

/* Accessibility: Focus styles */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}