/* ========================================
   DA1LY Marketing Site - Styles
   A calm, minimal, Apple-inspired design
======================================== */

/* CSS Custom Properties */
:root {
    /* Brand Colors */
    --color-primary: #FF6B5B;
    --color-primary-dark: #E55A4A;
    --color-primary-light: #FF897C;
    --color-primary-gradient: linear-gradient(135deg, #FF897C 0%, #FF6B5B 50%, #E55A4A 100%);
    
    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-off-white: #FAFAFA;
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* 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-5xl: 8rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-phone: 0 30px 60px -10px rgba(0, 0, 0, 0.2), 0 18px 36px -18px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

/* 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: 16px;
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ========================================
   Navigation
======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: var(--transition-base);
}

.nav.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.nav-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
}

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

.nav-link {
    font-size: 0.9375rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-600);
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-gray-900);
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-gray-900);
    color: var(--color-white);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.nav-cta:hover {
    background: var(--color-gray-700);
    transform: translateY(-1px);
}

.nav-cta .apple-icon {
    width: 16px;
    height: 16px;
}

/* ========================================
   Buttons
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--color-gray-900);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-gray-700);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-large {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1.125rem;
}

.apple-icon {
    width: 20px;
    height: 20px;
}

/* ========================================
   Hero Section
======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(64px + var(--space-4xl)) 0 var(--space-4xl);
    overflow: hidden;
}

.hero-gradient {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(ellipse at center, rgba(255, 107, 91, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

@media (min-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-4xl);
    }
}

.hero-text {
    text-align: center;
}

@media (min-width: 768px) {
    .hero-text {
        text-align: left;
    }
}

.hero-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin: 0 auto var(--space-xl);
}

@media (min-width: 768px) {
    .hero-icon {
        margin: 0 0 var(--space-xl);
    }
}

.hero-headline {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-lg);
}

.hero-subheadline {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    font-weight: var(--font-weight-regular);
    color: var(--color-gray-600);
    line-height: 1.5;
    max-width: 500px;
    margin: 0 auto var(--space-xl);
}

@media (min-width: 768px) {
    .hero-subheadline {
        margin: 0 0 var(--space-xl);
    }
}

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

@media (min-width: 768px) {
    .hero-cta-group {
        align-items: flex-start;
    }
}

.hero-note {
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

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

.phone-mockup {
    position: relative;
    width: 280px;
}

.phone-mockup.small {
    width: 220px;
}

.phone-frame {
    position: relative;
    background: var(--color-gray-900);
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-phone);
}

.phone-mockup.small .phone-frame {
    border-radius: 32px;
    padding: 10px;
}

.phone-screen {
    border-radius: 28px;
    width: 100%;
    display: block;
}

.phone-mockup.small .phone-screen {
    border-radius: 24px;
}

/* ========================================
   Sections
======================================== */
.section {
    padding: var(--space-5xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
}

/* What DA1LY Is Section */
.section-what {
    background: var(--color-gray-50);
}

.what-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.what-lead {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-700);
    margin-bottom: var(--space-sm);
}

.what-body {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    margin-top: var(--space-xl);
    line-height: 1.7;
}

/* How It Works Section */
.steps-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

@media (min-width: 768px) {
    .steps-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-2xl);
    }
}

.step-card {
    text-align: center;
    padding: var(--space-2xl);
    background: var(--color-white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-gray-100);
    transition: var(--transition-base);
}

.step-card:hover {
    border-color: var(--color-gray-200);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--color-primary-gradient);
    color: var(--color-white);
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-lg);
}

.step-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-900);
    margin-bottom: var(--space-sm);
}

.step-text {
    font-size: 1rem;
    color: var(--color-gray-600);
    line-height: 1.6;
}

/* Screenshots Section */
.section-screenshots {
    background: var(--color-gray-50);
    overflow: hidden;
}

.screenshots-carousel {
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding: var(--space-lg) 0;
    margin: 0 calc(-1 * var(--container-padding));
}

.screenshots-carousel::-webkit-scrollbar {
    display: none;
}

.screenshots-track {
    display: flex;
    gap: var(--space-xl);
    padding: 0 var(--container-padding);
    justify-content: center;
}

@media (max-width: 767px) {
    .screenshots-track {
        justify-content: flex-start;
    }
}

.screenshot-item {
    flex: 0 0 auto;
    text-align: center;
}

.screenshot-label {
    display: block;
    margin-top: var(--space-md);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-500);
}

.screenshots-caption {
    text-align: center;
    margin-top: var(--space-2xl);
    font-size: 1rem;
    color: var(--color-gray-600);
    font-style: italic;
}

/* DA1LY Plus Section */
.section-plus {
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-gray-50) 100%);
}

.plus-card {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    padding: var(--space-3xl);
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-xl);
}

.plus-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--color-primary-gradient);
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-lg);
}

.plus-title {
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
    margin-bottom: var(--space-md);
}

.plus-intro {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    margin-bottom: var(--space-2xl);
}

.plus-features {
    text-align: left;
    margin-bottom: var(--space-2xl);
}

.plus-features li {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    font-size: 1rem;
    color: var(--color-gray-700);
    border-bottom: 1px solid var(--color-gray-100);
}

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

.check-icon {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.plus-pricing {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    margin-bottom: var(--space-md);
}

.plus-note {
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    background: var(--color-gray-100);
    color: var(--color-gray-700);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-full);
}

/* Philosophy Section */
.section-philosophy {
    padding: var(--space-5xl) 0;
}

.philosophy-content {
    text-align: center;
    max-width: 650px;
    margin: 0 auto;
}

.philosophy-title {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
    margin-bottom: var(--space-xl);
    letter-spacing: -0.02em;
}

.philosophy-text {
    font-size: 1.25rem;
    color: var(--color-gray-600);
    line-height: 1.7;
    margin-bottom: var(--space-sm);
}

/* Final CTA Section */
.section-final-cta {
    background: var(--color-gray-50);
    padding: var(--space-5xl) 0;
}

.final-cta-content {
    text-align: center;
}

.final-cta-icon {
    width: 96px;
    height: 96px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin: 0 auto var(--space-xl);
}

.final-cta-title {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
    margin-bottom: var(--space-xl);
}

.final-cta-note {
    margin-top: var(--space-lg);
    font-size: 0.9375rem;
    color: var(--color-gray-500);
}

/* ========================================
   Footer
======================================== */
.footer {
    background: var(--color-white);
    border-top: 1px solid var(--color-gray-100);
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-gray-100);
}

@media (min-width: 640px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
    }
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.footer-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
}

.footer-name {
    font-size: 1rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
}

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

.footer-link {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    transition: var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--space-xl);
    text-align: center;
}

.footer-copyright {
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

/* ========================================
   Animations
======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.8s ease forwards;
}

.delay-1 {
    animation-delay: 0.1s;
}

.delay-2 {
    animation-delay: 0.2s;
}

.delay-3 {
    animation-delay: 0.3s;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

/* ========================================
   Responsive Adjustments
======================================== */
@media (max-width: 767px) {
    .nav-links {
        gap: var(--space-md);
    }
    
    .nav-link {
        display: none;
    }
    
    .hero {
        min-height: auto;
        padding: calc(64px + var(--space-3xl)) 0 var(--space-3xl);
    }
    
    .hero-content {
        gap: var(--space-2xl);
    }
    
    .hero-visual {
        order: -1;
    }
    
    .phone-mockup {
        width: 220px;
    }
    
    .section {
        padding: var(--space-4xl) 0;
    }
}

/* Focus states for accessibility */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}