/* ============================================
   DAN Landing Page - Design System & Styles
   ============================================ */

/* ============ CSS Variables (Tokens) ============ */
:root {
    /* Colors */
    --color-primary: #0d1b3f;
    --color-primary-dark: #060e24;
    --color-primary-light: #1c3268;

    --color-bg: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-bg-tertiary: #f3f4f6;

    --color-text: #1f2937;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;

    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;
    --font-size-4xl: 40px;
    --font-size-5xl: 48px;
    --font-size-6xl: 64px;

    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 40px;
    --spacing-3xl: 48px;
    --spacing-4xl: 64px;
    --spacing-5xl: 80px;
    --spacing-6xl: 120px;

    /* Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============ Typography ============ */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
}

p {
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: var(--color-primary-dark);
}

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

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--spacing-2xl);
    }
}

/* ============ Header / Navigation ============ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-light);
    padding: var(--spacing-lg) 0;
}

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

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    letter-spacing: -0.5px;
}

.logo-text a {
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: block;
}

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

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

.nav-link {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

@media (max-width: 768px) {
    .header__nav {
        gap: var(--spacing-md);
        font-size: var(--font-size-xs);
    }

    .nav-link {
        display: none;
    }

    .nav-link:last-child {
        display: inline-block;
    }
}

/* ============ Buttons ============ */
.cta-button {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.cta-button--primary {
    background-color: var(--color-primary);
    color: white;
}

.cta-button--primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.cta-button--primary:active {
    transform: translateY(0);
}

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

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

.cta-button--small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.cta-button--large {
    padding: var(--spacing-lg) var(--spacing-3xl);
    font-size: var(--font-size-lg);
}

/* ============ Hero Section ============ */
.hero {
    padding: var(--spacing-6xl) 0 var(--spacing-5xl);
}

.hero__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-6xl);
    align-items: center;
}

.hero__title {
    font-size: var(--font-size-5xl);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-xl);
    color: var(--color-text);
}

.hero__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-2xl);
}

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

.iphone-mockup {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.iphone-mockup__screen {
    width: 100%;
    max-width: 380px;
    aspect-ratio: 9 / 19.5;
    border-radius: 32px;
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
}

.mockup-carousel {
    position: relative;
    width: 100%;
    height: 100%;
}

.mockup-carousel__image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 32px;
    background: var(--color-bg-tertiary);
    opacity: 0;
    transition: opacity var(--transition-slow) ease-in-out;
}

.mockup-carousel__image.active {
    opacity: 1;
}

.mockup-carousel__dots {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 6px;
    z-index: 10;
}

.dot {
    width: 6px;
    height: 6px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.dot.active {
    background: white;
    width: 24px;
    border-radius: 3px;
}

@media (max-width: 1024px) {
    .hero {
        padding: var(--spacing-5xl) 0 var(--spacing-4xl);
    }

    .hero__content {
        grid-template-columns: 1fr;
        gap: var(--spacing-4xl);
    }

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

    .hero__ctas {
        flex-direction: column;
    }
}

@media (max-width: 640px) {
    .hero {
        padding: var(--spacing-4xl) 0 var(--spacing-3xl);
    }

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

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

/* ============ Problem Section ============ */
.problem {
    padding: var(--spacing-6xl) 0;
    background-color: var(--color-bg-secondary);
}

.problem__content {
    max-width: 700px;
    margin: 0 auto;
}

.section-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-4xl);
    text-align: center;
    color: var(--color-primary);
}

.problem__narrative {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    text-align: center;
}

.problem__narrative p {
    margin: 0;
}

.problem__narrative--highlight {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    font-size: var(--font-size-xl);
}

.problem__conclusion {
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary) !important;
    font-size: var(--font-size-lg) !important;
    margin-top: var(--spacing-lg);
}

@media (max-width: 768px) {
    .problem {
        padding: var(--spacing-5xl) 0;
    }

    .section-title {
        font-size: var(--font-size-3xl);
        margin-bottom: var(--spacing-3xl);
    }

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

/* ============ Benefits Section ============ */
.benefits {
    padding: var(--spacing-6xl) 0;
}

.benefits__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-4xl);
}

.benefit-card {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-2xl);
    transition: all var(--transition-normal);
    align-items: flex-start;
}

.benefit-card:hover {
    background-color: var(--color-bg-secondary);
    transform: translateY(-4px);
}

.benefit-card__icon {
    width: 56px;
    height: 56px;
    min-width: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    font-size: 24px;
    flex-shrink: 0;
}

.benefit-card__icon svg {
    width: 40px;
    height: 40px;
}

.benefit-card__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    flex: 1;
}

.benefit-card__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin: 0;
}

.benefit-card__description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin: 0;
}

@media (max-width: 1024px) {
    .benefits__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-3xl);
    }
}

@media (max-width: 640px) {
    .benefits {
        padding: var(--spacing-5xl) 0;
    }

    .benefits__grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .benefit-card {
        padding: var(--spacing-lg);
        flex-direction: column;
        align-items: flex-start;
    }

    .benefit-card__content {
        flex: 1;
    }
}

/* ============ Gallery Section ============ */
.gallery {
    padding: var(--spacing-6xl) 0;
    background-color: var(--color-bg-secondary);
}

.gallery__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-4xl);
}

.gallery__item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.gallery__title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
}

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

.gallery__image {
    width: 100%;
    aspect-ratio: 9 / 19.5;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    background: var(--color-bg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}

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

@media (max-width: 1024px) {
    .gallery__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-3xl);
    }
}

@media (max-width: 640px) {
    .gallery {
        padding: var(--spacing-5xl) 0;
    }

    .gallery__grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
}

/* ============ Trust Section ============ */
.trust {
    padding: var(--spacing-6xl) 0;
}

.trust__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-5xl);
}

.trust__item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.trust__icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
}

.trust__item h3 {
    font-size: var(--font-size-lg);
    color: var(--color-text);
}

.trust__item p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin: 0;
}

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

@media (max-width: 1024px) {
    .trust__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-2xl);
    }
}

@media (max-width: 640px) {
    .trust {
        padding: var(--spacing-5xl) 0;
    }

    .trust__grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
}

/* ============ FAQ Section ============ */
.faq {
    padding: var(--spacing-6xl) 0;
    background-color: var(--color-bg-secondary);
}

.faq__list {
    max-width: 700px;
    margin: 0 auto var(--spacing-4xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.faq__item {
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg);
}

.faq__question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    user-select: none;
    list-style: none;
}

.faq__question::after {
    content: "▼";
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    transition: transform var(--transition-fast);
}

.faq__item[open] > .faq__question::after {
    transform: rotate(180deg);
}

.faq__answer {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

.faq__contact {
    text-align: center;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
}

.faq__contact p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.faq__contact-link {
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
}

@media (max-width: 640px) {
    .faq {
        padding: var(--spacing-5xl) 0;
    }

    .faq__list {
        margin-bottom: var(--spacing-3xl);
    }
}

/* ============ Final CTA Section ============ */
.final-cta {
    padding: var(--spacing-6xl) 0;
    text-align: center;
}

.final-cta__title {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    line-height: var(--line-height-tight);
}

.final-cta__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-3xl);
}

@media (max-width: 768px) {
    .final-cta {
        padding: var(--spacing-5xl) 0;
    }

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

/* ============ Footer ============ */
.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

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

.footer__links {
    display: flex;
    gap: var(--spacing-2xl);
}

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

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

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

.footer__secondary p {
    margin: 0;
}

@media (max-width: 640px) {
    .footer__content {
        flex-direction: column;
        text-align: center;
    }

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

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

.section-title {
    animation: fadeInUp 0.6s ease-out;
}

.benefit-card {
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
}

.benefit-card:nth-child(1) {
    animation-delay: 0.1s;
}

.benefit-card:nth-child(2) {
    animation-delay: 0.2s;
}

.benefit-card:nth-child(3) {
    animation-delay: 0.3s;
}

/* Scroll animation helper */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease-out forwards;
}

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

/* Print styles */
@media print {
    .header,
    .footer {
        display: none;
    }
}