/* ============================================
   CSS VARIABLES - Matching Email Template Colors
   ============================================ */
:root {
    /* Light mode colors - from email templates */
    --color-primary-text: #2d3748;
    --color-secondary-text: #718096;
    --color-light-text: #a0aec0;
    --color-accent: #4a5568;
    --color-soft-accent: #667eea;
    --color-background: #f7f7f7;
    --color-card-bg: #ffffff;
    --color-subtle-border: #e2e8f0;
    --color-soft-highlight: #f7fafc;

    /* Shadow colors */
    --shadow-light: rgba(45, 55, 72, 0.08);
    --shadow-medium: rgba(45, 55, 72, 0.12);
    --shadow-dark: rgba(45, 55, 72, 0.2);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --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: 3rem;

    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ============================================
   DARK MODE - Based on Device Preference
   ============================================ */
@media (prefers-color-scheme: dark) {
    :root {
        /* Dark mode colors - inverted palette */
        --color-primary-text: #e2e8f0;
        --color-secondary-text: #a0aec0;
        --color-light-text: #718096;
        --color-accent: #cbd5e0;
        --color-soft-accent: #8b9bff;
        --color-background: #1a202c;
        --color-card-bg: #2d3748;
        --color-subtle-border: #4a5568;
        --color-soft-highlight: #374151;

        /* Shadow colors for dark mode */
        --shadow-light: rgba(0, 0, 0, 0.2);
        --shadow-medium: rgba(0, 0, 0, 0.3);
        --shadow-dark: rgba(0, 0, 0, 0.5);
    }

    /* Navigation transparency in dark mode */
    .nav {
        background-color: rgba(45, 55, 72, 0.95);
    }

    /* Adjust gradient text for better contrast in dark mode */
    .gradient-text {
        background: linear-gradient(135deg, #8b9bff 0%, #cbd5e0 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    /* Dark mode download card adjustment */
    .download-card {
        background: linear-gradient(135deg, #667eea 0%, #5a67d8 100%);
    }
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    color-scheme: light dark;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-primary-text);
    background-color: var(--color-background);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

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

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

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
    position: sticky;
    top: 0;
    background-color: var(--color-card-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-subtle-border);
    z-index: 100;
    transition: box-shadow var(--transition-base), background-color var(--transition-base), border-color var(--transition-base);
}

.nav.scrolled {
    box-shadow: 0 2px 12px var(--shadow-light);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--color-primary-text);
}

.logo-icon {
    font-size: var(--font-size-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.nav-link {
    text-decoration: none;
    color: var(--color-secondary-text);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-soft-accent);
    transition: width var(--transition-base);
}

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

.nav-link:hover::after {
    width: 100%;
}

@media (max-width: 640px) {
    .nav-links {
        gap: var(--spacing-md);
    }

    .logo-text {
        display: none;
    }
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--color-soft-highlight) 0%, var(--color-background) 100%);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-text);
    animation: fadeInUp 0.6s ease;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-soft-accent) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--font-size-xl);
    color: var(--color-secondary-text);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
    animation: fadeInUp 0.6s ease 0.1s backwards;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.6s ease 0.2s backwards;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    max-width: 600px;
    margin: 0 auto;
    animation: fadeInUp 0.6s ease 0.3s backwards;
}

.stat {
    padding: var(--spacing-lg);
    background-color: var(--color-card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-subtle-border);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.stat:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px var(--shadow-light);
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-soft-accent);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-secondary-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-2xl) 0;
    }

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

    .hero-description {
        font-size: var(--font-size-lg);
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-stats {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-family);
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-text);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--shadow-medium);
}

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

.btn-secondary:hover {
    background-color: var(--color-accent);
    color: var(--color-card-bg);
    transform: translateY(-1px);
}

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

.btn-outline:hover {
    background-color: var(--color-soft-highlight);
    color: var(--color-primary-text);
    border-color: var(--color-accent);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
}

/* Button groups */
.button-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.button-group .btn {
    flex: 1;
    min-width: 0;
}

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

.template-downloads .btn {
    width: 100%;
    min-width: 0;
    font-size: var(--font-size-sm);
    padding: 0.625rem 0.75rem;
}

/* Button icons */
.btn-icon {
    width: 16px;
    height: 16px;
    margin-right: 4px;
    display: inline-block;
    vertical-align: middle;
    flex-shrink: 0;
}

/* ============================================
   SECTION HEADERS
   ============================================ */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
}

.section-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--color-soft-highlight);
    color: var(--color-soft-accent);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--color-subtle-border);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-text);
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--color-secondary-text);
    line-height: 1.6;
}

@media (max-width: 768px) {
    .section-title {
        font-size: var(--font-size-2xl);
    }

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

/* ============================================
   MASTER SHOWCASE SECTION
   ============================================ */
.master-showcase {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-card-bg);
}

.master-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    padding: var(--spacing-xl);
    background-color: var(--color-soft-highlight);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-subtle-border);
}

.master-preview {
    animation: fadeInLeft 0.6s ease;
}

.browser-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-card-bg);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    border: 1px solid var(--color-subtle-border);
    border-bottom: none;
}

.browser-dots {
    display: flex;
    gap: 6px;
}

.browser-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--color-subtle-border);
}

.browser-dots span:nth-child(1) {
    background-color: #ff6058;
}

.browser-dots span:nth-child(2) {
    background-color: #ffbd2e;
}

.browser-dots span:nth-child(3) {
    background-color: #27c93f;
}

.browser-title {
    font-size: var(--font-size-sm);
    color: var(--color-secondary-text);
    font-weight: 500;
}

.template-preview-image {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-subtle-border);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    padding: var(--spacing-lg);
    overflow: hidden;
}

.email-preview {
    max-width: 400px;
    margin: 0 auto;
    background-color: var(--color-background);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: 0 4px 16px var(--shadow-light);
}

.email-header {
    height: 60px;
    background-color: var(--color-card-bg);
    border-bottom: 1px solid var(--color-subtle-border);
}

.email-hero {
    height: 120px;
    background: linear-gradient(135deg, var(--color-soft-accent) 0%, var(--color-accent) 100%);
}

.email-content {
    padding: var(--spacing-md);
}

.email-block {
    height: 40px;
    background-color: var(--color-card-bg);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--color-subtle-border);
}

.email-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.email-grid div {
    height: 60px;
    background-color: var(--color-card-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-subtle-border);
}

.email-footer {
    height: 50px;
    background-color: var(--color-soft-highlight);
    border-top: 1px solid var(--color-subtle-border);
}

.master-details {
    animation: fadeInRight 0.6s ease;
}

.master-subtitle {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-primary-text);
}

.feature-list {
    list-style: none;
    margin-bottom: var(--spacing-xl);
}

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

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--color-accent);
    color: var(--color-card-bg);
    font-size: var(--font-size-sm);
    font-weight: 700;
    flex-shrink: 0;
}

@media (max-width: 968px) {
    .master-card {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
}

/* ============================================
   TEMPLATES GRID SECTION
   ============================================ */
.templates-section {
    padding: var(--spacing-3xl) 0;
}

.templates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.template-card {
    padding: var(--spacing-xl);
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-subtle-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    animation: fadeInUp 0.6s ease backwards;
}

.template-card:nth-child(1) { animation-delay: 0.1s; }
.template-card:nth-child(2) { animation-delay: 0.2s; }
.template-card:nth-child(3) { animation-delay: 0.3s; }
.template-card:nth-child(4) { animation-delay: 0.4s; }
.template-card:nth-child(5) { animation-delay: 0.5s; }

.template-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px var(--shadow-medium);
    border-color: var(--color-soft-accent);
}

.template-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background-color: var(--color-soft-highlight);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-subtle-border);
}

.template-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary-text);
}

.template-description {
    font-size: var(--font-size-base);
    color: var(--color-secondary-text);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.template-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.tag {
    padding: 0.25rem 0.75rem;
    background-color: var(--color-soft-highlight);
    color: var(--color-secondary-text);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-full);
    border: 1px solid var(--color-subtle-border);
}

/* ============================================
   FEATURES SECTION
   ============================================ */
.features-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-card-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    text-align: center;
    animation: fadeInUp 0.6s ease backwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }

.feature-icon-box {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    background-color: var(--color-soft-highlight);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-subtle-border);
    color: var(--color-accent);
    transition: all var(--transition-base);
}

.feature-card:hover .feature-icon-box {
    background-color: var(--color-accent);
    color: var(--color-card-bg);
    transform: scale(1.05);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary-text);
}

.feature-description {
    font-size: var(--font-size-base);
    color: var(--color-secondary-text);
    line-height: 1.6;
}

/* ============================================
   DOWNLOAD SECTION
   ============================================ */
.download-section {
    padding: var(--spacing-3xl) 0;
}

.download-card {
    text-align: center;
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--color-soft-accent) 0%, var(--color-accent) 100%);
    border-radius: var(--radius-xl);
    color: var(--color-card-bg);
}

.download-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.download-description {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

.download-card .btn-primary {
    background-color: var(--color-card-bg);
    color: var(--color-accent);
}

.download-card .btn-primary:hover {
    background-color: var(--color-soft-highlight);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow-dark);
}

.download-note {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

@media (max-width: 768px) {
    .download-title {
        font-size: var(--font-size-2xl);
    }

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

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    background-color: var(--color-card-bg);
    border-top: 1px solid var(--color-subtle-border);
}

.footer-content {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--color-primary-text);
    margin-bottom: var(--spacing-md);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-subtle-border);
    color: var(--color-light-text);
    font-size: var(--font-size-sm);
}

/* ============================================
   TOAST NOTIFICATION
   ============================================ */
.toast {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-accent);
    color: var(--color-card-bg);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px var(--shadow-dark);
    z-index: 1000;
    transition: bottom var(--transition-base);
    font-weight: 500;
}

.toast.show {
    bottom: var(--spacing-lg);
}

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 640px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }

    .button-group {
        flex-direction: column;
    }

    .button-group .btn {
        width: 100%;
    }

    .template-downloads {
        grid-template-columns: 1fr;
    }

    .template-downloads .btn {
        font-size: var(--font-size-sm);
        padding: 0.75rem 1.5rem;
    }

    .btn-icon {
        width: 16px;
        height: 16px;
        margin-right: 4px;
    }
}