/* ===== CSS Variables ===== */
:root {
    --primary: #6074FF;
    --primary-light: rgba(96, 116, 255, 0.15);
    --gradient-primary: linear-gradient(135deg, #6074FF 0%, #9B8DFF 100%);
    --trimester1: #6074FF;
    --trimester2: #5BC0EB;
    --trimester3: #9B8DFF;
    --success: #58D68D;
    --warning: #F5B041;
    --error: #EC7063;
    --pink: #F1948A;
    --blue: #5DADE2;
    --green: #58D68D;
    --purple: #6074FF;
    --orange: #F5B041;
    --gray: #AAB7B8;

    --bg-primary: #F8F9FA;
    --bg-secondary: #FFFFFF;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a4a;
    --border-color: #E9ECEF;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-family-ar: 'Tajawal', 'Inter', sans-serif;
}

/* RTL Support */
[dir="rtl"] {
    --font-family: var(--font-family-ar);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

[dir="rtl"] body {
    font-family: var(--font-family-ar);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

ul {
    list-style: none;
}

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

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

.btn-primary:hover {
    background: #4A5EE0;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-block {
    width: 100%;
}

/* ===== Navbar ===== */
.navbar {
    background: var(--bg-secondary);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.logo i {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.language-selector {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
}

.lang-btn:hover {
    border-color: var(--primary);
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    max-height: 400px;
    overflow-y: auto;
    display: none;
    z-index: 100;
}

[dir="rtl"] .lang-dropdown {
    right: auto;
    left: 0;
}

.lang-dropdown.show {
    display: block;
}

.lang-dropdown a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-primary);
    transition: background 0.3s;
}

.lang-dropdown a:hover {
    background: var(--bg-primary);
}

.lang-dropdown a.active {
    background: var(--primary-light);
    color: var(--primary);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

/* ===== Hero Section ===== */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--bg-secondary) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.pregnancy-circle {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--trimester1) 0%, var(--trimester2) 50%, var(--trimester3) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.week-display {
    text-align: center;
    color: white;
}

.week-number {
    font-size: 4rem;
    font-weight: 700;
    display: block;
}

.week-label {
    font-size: 1.25rem;
    opacity: 0.9;
}

/* ===== Quick Calculator ===== */
.quick-calculator {
    padding: 80px 0;
    margin-top: -40px;
}

.calc-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.calc-card h2 {
    margin-bottom: 8px;
    color: var(--text-primary);
}

.calc-card > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.calc-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    text-align: start;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.3s;
}

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

.calc-results {
    margin-top: 32px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.result-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    text-align: start;
}

.result-item i {
    font-size: 1.5rem;
    color: var(--primary);
    width: 40px;
    height: 40px;
    background: var(--primary-light);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.result-value {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ===== Features Section ===== */
.features {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 48px;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-primary);
    padding: 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.feature-icon i {
    font-size: 1.75rem;
    color: white;
}

.feature-card h3 {
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== Trimester Section ===== */
.trimester-section {
    padding: 80px 0;
}

.trimester-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.trimester-card {
    background: var(--bg-secondary);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border-top: 4px solid;
}

.trimester-1 { border-top-color: var(--trimester1); }
.trimester-2 { border-top-color: var(--trimester2); }
.trimester-3 { border-top-color: var(--trimester3); }

.trimester-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 8px;
}

.trimester-badge {
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    color: white;
}

.trimester-1 .trimester-badge { background: var(--trimester1); }
.trimester-2 .trimester-badge { background: var(--trimester2); }
.trimester-3 .trimester-badge { background: var(--trimester3); }

.trimester-weeks {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.trimester-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== Download Section ===== */
.download-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--trimester3) 100%);
    color: white;
    text-align: center;
}

.download-content h2 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.download-content p {
    opacity: 0.9;
    margin-bottom: 32px;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.store-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 24px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-md);
    color: white;
    transition: background 0.3s;
}

.store-btn:hover {
    background: rgba(255, 255, 255, 0.25);
}

.store-btn i {
    font-size: 2rem;
}

.store-btn span {
    font-size: 0.75rem;
    opacity: 0.9;
}

.store-btn strong {
    display: block;
    font-size: 1.125rem;
}

/* ===== Footer ===== */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    color: white;
    margin-bottom: 16px;
}

.footer-brand p {
    opacity: 0.7;
    line-height: 1.7;
}

.footer-links h4 {
    margin-bottom: 20px;
    font-size: 1rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    opacity: 0.7;
    transition: opacity 0.3s;
}

.footer-links a:hover {
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
}

/* ===== Mobile Menu ===== */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-secondary);
    z-index: 2000;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
}

[dir="rtl"] .mobile-menu {
    transform: translateX(100%);
}

.mobile-menu.show {
    transform: translateX(0);
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.close-menu-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

.mobile-menu-links {
    display: flex;
    flex-direction: column;
    padding: 20px;
}

.mobile-menu-links a {
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 1.125rem;
    color: var(--text-primary);
}

.mobile-menu-links a.active {
    color: var(--primary);
}

/* ===== Responsive ===== */
@media (max-width: 992px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 2.25rem;
    }

    .hero-buttons {
        justify-content: center;
    }

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

    .trimester-cards {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 576px) {
    .hero-content h1 {
        font-size: 1.75rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .pregnancy-circle {
        width: 200px;
        height: 200px;
    }

    .week-number {
        font-size: 3rem;
    }

    .calc-card {
        padding: 24px;
    }

    .calc-results {
        grid-template-columns: 1fr;
    }

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

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

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
}