/* ==========================================================================
   Simplann - Premium Student Time Management Website
   ========================================================================== */

/* CSS Variables
   ========================================================================== */
:root {
    /* Brand Colors - Based on book cover */
    --color-primary: #1d9b6a;
    --color-primary-dark: #157a53;
    --color-primary-light: #2bb57e;
    --color-accent: #d4af37;
    --color-accent-dark: #b8982e;
    --color-accent-light: #e5c761;
    
    /* Neutral Colors */
    --color-text: #1a1a1a;
    --color-text-light: #4a4a4a;
    --color-text-lighter: #6a6a6a;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fa;
    --color-border: #e0e0e0;
    
    /* Semantic Colors */
    --color-success: #1d9b6a;
    --color-error: #d32f2f;
    --color-info: #1976d2;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing Scale */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    --spacing-xxl: 6rem;
    
    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    
    /* Transitions */
    --transition: 0.3s ease;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

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

/* Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--color-text);
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
}

h3 {
    font-size: clamp(1.375rem, 3vw, 1.75rem);
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
}

.text-large {
    font-size: 1.125rem;
    line-height: 1.7;
}

.text-small {
    font-size: 0.875rem;
}

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

.text-muted {
    color: var(--color-text-light);
}

/* Layout Components
   ========================================================================== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-narrow {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xxl) 0;
}

.section-sm {
    padding: var(--spacing-xl) 0;
}

/* Header
   ========================================================================== */
.site-header {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-main ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-main a {
    color: var(--color-text);
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-main a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition);
}

.nav-main a:hover::after,
.nav-main a.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--color-text);
    margin: 5px 0;
    transition: all var(--transition);
}

/* Hero Section
   ========================================================================== */
.hero {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
}

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

.hero-text h1 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.hero-text .subheading {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.hero-image {
    position: relative;
}

.hero-image img {
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

/* Buttons
   ========================================================================== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--border-radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    line-height: 1.5;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(29, 155, 106, 0.3);
}

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

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

.btn-accent {
    background-color: var(--color-accent);
    color: var(--color-text);
    border-color: var(--color-accent);
}

.btn-accent:hover {
    background-color: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
    color: var(--color-text);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

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

/* Stacked buttons should have equal width */
.btn-group-stacked {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

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

/* Cards
   ========================================================================== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

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

.card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

.card-icon {
    width: 48px;
    height: 48px;
    background-color: var(--color-primary);
    color: white;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.card h3 {
    margin-bottom: var(--spacing-sm);
}

.card p {
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* Forms
   ========================================================================== */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.875rem;
    font-size: 1rem;
    font-family: var(--font-family);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: all var(--transition);
    background-color: white;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(29, 155, 106, 0.1);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.form-note {
    font-size: 0.875rem;
    color: var(--color-text-lighter);
    margin-top: var(--spacing-xs);
}

.form-inline {
    display: flex;
    gap: var(--spacing-sm);
}

.form-inline .form-input {
    flex: 1;
}

.form-success,
.form-error {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin: var(--spacing-md) 0;
}

.form-success {
    background-color: #e8f5e9;
    border: 1px solid var(--color-success);
    color: var(--color-success);
}

.form-error {
    background-color: #ffebee;
    border: 1px solid var(--color-error);
    color: var(--color-error);
}

/* Features Section
   ========================================================================== */
.features {
    background-color: var(--color-bg-alt);
}

.feature-list {
    list-style: none;
    margin-top: var(--spacing-lg);
}

.feature-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.feature-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
    font-size: 1.25rem;
}

/* Planners Showcase
   ========================================================================== */
.planner-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.planner-card {
    background-color: white;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: all var(--transition);
}

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

.planner-preview {
    aspect-ratio: 3/4;
    background-color: var(--color-bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--color-border);
}

.planner-preview img {
    max-height: 100%;
    object-fit: contain;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border-radius: 4px;
}

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

.planner-content h3 {
    margin-bottom: var(--spacing-xs);
}

.planner-content p {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    margin-bottom: 0;
}

/* CTA Sections
   ========================================================================== */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    text-align: center;
    padding: var(--spacing-xxl) 0;
}

.cta-section h2,
.cta-section h3,
.cta-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.cta-section p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

/* Book Section
   ========================================================================== */
.book-showcase {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.book-cover {
    position: relative;
}

.book-cover img {
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.book-details h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.book-details ul {
    list-style: none;
    margin: var(--spacing-md) 0;
}

.book-details li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.book-details li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: bold;
}

/* Footer
   ========================================================================== */
.site-footer {
    background-color: var(--color-text);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-sm);
}

.footer-section p,
.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9375rem;
}

.footer-section a:hover {
    color: white;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
}

/* Utility Classes
   ========================================================================== */
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.bg-alt { background-color: var(--color-bg-alt); }

/* Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
    :root {
        --spacing-xxl: 3rem;
        --spacing-xl: 2rem;
    }
    
    .nav-main {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: white;
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-md);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }
    
    .nav-main.active {
        display: block;
    }
    
    .nav-main ul {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-toggle {
        display: block;
    }
    
    .hero-content,
    .book-showcase {
        grid-template-columns: 1fr;
    }
    
    .hero-image {
        order: -1;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .form-inline {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .container,
    .container-narrow {
        padding: 0 var(--spacing-sm);
    }
    
    .card-grid,
    .planner-grid {
        grid-template-columns: 1fr;
    }
}

/* Amazon Market Selector Modal
   ========================================================================== */
.market-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.market-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.market-modal-content {
    position: relative;
    background-color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.market-modal-content .modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 32px;
    height: 32px;
    border: none;
    background: none;
    font-size: 28px;
    line-height: 1;
    color: var(--color-text-lighter);
    cursor: pointer;
    transition: color var(--transition), transform var(--transition);
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.market-modal-content .modal-close:hover {
    color: var(--color-text);
    transform: scale(1.1);
}

.market-modal-content .modal-close:active {
    transform: scale(0.95);
}

.market-modal-content h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    padding-right: var(--spacing-xl);
}

.market-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.market-buttons button {
    padding: var(--spacing-md);
    background-color: white;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition);
    text-align: left;
}

.market-buttons button:hover {
    border-color: var(--color-primary);
    background-color: var(--color-bg-alt);
    transform: translateX(4px);
}

.market-buttons button.recommended {
    border-color: var(--color-accent);
    background-color: rgba(212, 175, 55, 0.05);
}

.market-buttons button.recommended::after {
    content: " (Recommended)";
    color: var(--color-accent);
    font-size: 0.875rem;
    font-weight: 600;
}

/* Print Styles
   ========================================================================== */
@media print {
    .site-header,
    .site-footer,
    .cta-section,
    .btn,
    .market-modal {
        display: none;
    }
}