/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary-color: #007AFF;
    --primary-dark: #0051D5;
    --secondary-color: #5856D6;
    --success-color: #34C759;
    --text-primary: #1D1D1F;
    --text-secondary: #6E6E73;
    --border-color: #D2D2D7;
    --bg-light: #F5F5F7;
    --bg-white: #FFFFFF;
    --highlight-bg: #F0F8FF;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.5;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-xxl: 64px;

    /* Container */
    --container-max-width: 1200px;
    --container-padding: 20px;

    /* Borders */
    --border-radius: 12px;
    --border-radius-sm: 8px;
}

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

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

/* Header */
.header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-color);
}

.nav {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s;
}

.nav a:hover {
    color: var(--primary-color);
    background-color: var(--bg-light);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--bg-white);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

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

.hero h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: var(--spacing-sm);
    opacity: 0.95;
}

.hero-description {
    font-size: 16px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: 2px solid transparent;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--bg-light);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--bg-white);
    border-color: var(--bg-white);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

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

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--bg-white);
}

/* App Store Buttons */
.app-store-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.app-store-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--text-primary);
    color: var(--bg-white);
    padding: 12px 24px;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    min-width: 180px;
}

.app-store-badge:hover {
    background-color: var(--text-secondary);
    transform: translateY(-2px);
}

.hero .app-store-badge {
    background-color: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.hero .app-store-badge:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

/* Section Styles */
section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 18px;
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Pricing Section */
.pricing {
    background-color: var(--bg-light);
}

.pricing-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.pricing-card {
    background-color: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    position: relative;
    transition: all 0.3s;
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.pricing-card.featured {
    border-color: var(--primary-color);
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.2);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-color);
    color: var(--bg-white);
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
}

.pricing-badge.sale {
    background: linear-gradient(135deg, #FF6B6B, #FF8E53);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

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

.pricing-header h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.pricing-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.pricing-amount {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.pricing-amount .price {
    font-size: 40px;
    font-weight: 700;
    color: var(--text-primary);
}

.pricing-amount .period {
    font-size: 16px;
    color: var(--text-secondary);
}

.pricing-amount .price-original {
    font-size: 20px;
    color: var(--text-secondary);
    text-decoration: line-through;
    margin-right: 8px;
}

.sale-ends {
    margin-top: var(--spacing-xs);
    font-size: 13px;
    color: #FF6B6B;
    font-weight: 600;
}

.pricing-features ul {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.pricing-features li {
    padding: 10px 0;
    color: var(--text-secondary);
    font-size: 15px;
}

.pricing-features li strong {
    color: var(--text-primary);
}

.pricing-features li:before {
    content: "✓";
    color: var(--success-color);
    font-weight: bold;
    margin-right: 10px;
}

.pricing-cta {
    text-align: center;
}

.pricing-note {
    background-color: var(--highlight-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    text-align: center;
    color: var(--text-secondary);
}

/* Comparison Section */
.comparison {
    background-color: var(--bg-white);
}

.comparison-table-wrapper {
    overflow-x: auto;
    margin-bottom: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

.comparison-table th,
.comparison-table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table thead th {
    background-color: var(--bg-light);
    font-weight: 600;
    color: var(--text-primary);
    position: sticky;
    top: 0;
    white-space: nowrap;
}

.comparison-table th.highlight,
.comparison-table td.highlight {
    background-color: var(--highlight-bg);
    font-weight: 600;
    color: var(--primary-color);
}

.comparison-table tbody tr:hover {
    background-color: var(--bg-light);
}

.comparison-table td:first-child {
    font-weight: 500;
    color: var(--text-primary);
}

.comparison-note {
    background-color: var(--bg-light);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
}

/* Calculator Section */
.calculator {
    background-color: var(--bg-light);
}

.calculator-content {
    max-width: 900px;
    margin: 0 auto;
}

.calculator-input {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.calculator-input label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-size: 18px;
}

.calculator-input input {
    width: 120px;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 24px;
    font-weight: 600;
    text-align: center;
    margin-right: var(--spacing-xs);
}

.calculator-input input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-suffix {
    color: var(--text-secondary);
    font-size: 16px;
}

.calculator-results {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.result-column {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
}

.result-column h3 {
    font-size: 20px;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    text-align: center;
}

.result-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.result-row:last-child {
    border-bottom: none;
}

.result-row.total {
    font-weight: 700;
    font-size: 18px;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 2px solid var(--border-color);
}

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

.result-value {
    color: var(--text-primary);
    font-weight: 600;
}

.result-note {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--bg-light);
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    color: var(--text-secondary);
    text-align: center;
}

.savings-highlight {
    background: linear-gradient(135deg, var(--success-color), #30D158);
    color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
}

.savings-amount {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.savings-amount .label {
    font-size: 16px;
    opacity: 0.9;
}

.savings-amount .amount {
    font-size: 36px;
    font-weight: 700;
}

.savings-amount .percentage {
    font-size: 20px;
    opacity: 0.9;
}

.calculator-breakdown {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
}

.calculator-breakdown h4 {
    font-size: 18px;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    text-align: center;
}

.breakdown-table {
    width: 100%;
    border-collapse: collapse;
}

.breakdown-table th,
.breakdown-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.breakdown-table th {
    background-color: var(--bg-light);
    font-weight: 600;
    color: var(--text-primary);
}

.breakdown-table td:last-child {
    font-weight: 600;
    color: var(--primary-color);
}

/* What's New Section */
.whats-new {
    background-color: var(--bg-white);
}

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

.update-card {
    background-color: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.update-badge {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--bg-white);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.update-card h3 {
    font-size: 20px;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.update-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* CTA Section */
.cta {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--bg-white);
    text-align: center;
    padding: var(--spacing-xxl) 0;
}

.cta h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.cta p {
    font-size: 18px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

/* Footer */
.footer {
    background-color: var(--text-primary);
    color: var(--bg-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-column h4 {
    font-size: 16px;
    margin-bottom: var(--spacing-sm);
    color: var(--bg-white);
}

.footer-column p,
.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
}

.footer-column a:hover {
    color: var(--bg-white);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 8px;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

/* Tablet Styles (768px and up) */
@media (min-width: 768px) {
    :root {
        --font-size-base: 18px;
        --container-padding: 32px;
    }

    .hero h2 {
        font-size: 48px;
    }

    .hero-subtitle {
        font-size: 24px;
    }

    .section-title {
        font-size: 42px;
    }

    .section-subtitle {
        font-size: 20px;
    }

    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pricing-card.power-user {
        grid-column: 1 / -1;
        max-width: 500px;
        margin: 0 auto;
        width: 100%;
    }

    .calculator-results {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
    }

    .savings-highlight {
        grid-column: 1 / -1;
    }

    .updates-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop Styles (1024px and up) */
@media (min-width: 1024px) {
    .hero h2 {
        font-size: 56px;
    }

    .section-title {
        font-size: 48px;
    }

    .pricing-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .pricing-card.power-user {
        grid-column: auto;
        max-width: none;
    }

    .updates-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-content {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Large Desktop Styles (1440px and up) */
@media (min-width: 1440px) {
    :root {
        --container-max-width: 1400px;
    }

    .pricing-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }