:root {
    --primary: #007AFF;
    --primary-dark: #0056b3;
    --bg-light: #FBFBFD;
    --bg-dark: #1D1D1F;
    --text-light: #1D1D1F;
    --text-dark: #F5F5F7;
    --card-bg-light: rgba(255, 255, 255, 0.7);
    --card-bg-dark: rgba(28, 28, 30, 0.7);
    --border-light: rgba(0, 0, 0, 0.1);
    --border-dark: rgba(255, 255, 255, 0.1);
    --blur: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

body {
    background-color: var(--bg-light);
    color: var(--text-light);
    line-height: 1.6;
    transition: var(--transition);
    overflow-x: hidden;
}

body.dark-mode {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

/* Glassmorphism Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    backdrop-filter: blur(var(--blur));
    -webkit-backdrop-filter: blur(var(--blur));
    background: var(--card-bg-light);
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition);
}

body.dark-mode nav {
    background: var(--card-bg-dark);
    border-bottom: 1px solid var(--border-dark);
}

.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo img {
    height: 48px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: inherit;
    font-weight: 500;
    font-size: 0.9rem;
    opacity: 0.8;
    transition: var(--transition);
}

.nav-links a:hover {
    opacity: 1;
    color: var(--primary);
}

/* Hero Section */
.hero {
    padding: 8rem 2rem 4rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary), #5AC8FA);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.7;
}

/* Content Sections */
.content-section {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 2rem;
}

.card {
    background: var(--card-bg-light);
    backdrop-filter: blur(var(--blur));
    -webkit-backdrop-filter: blur(var(--blur));
    border: 1px solid var(--border-light);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

body.dark-mode .card {
    background: var(--card-bg-dark);
    border: 1px solid var(--border-dark);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    margin-top: 2rem;
}

h2:first-of-type {
    margin-top: 0;
}

h3 {
    font-size: 1.25rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--primary);
}

p,
ul {
    margin-bottom: 1.25rem;
    opacity: 0.9;
}

ul {
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-light);
    color: inherit;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

body.dark-mode .theme-toggle {
    border-color: var(--border-dark);
}

.theme-toggle:hover {
    background: rgba(0, 0, 0, 0.05);
}

body.dark-mode .theme-toggle:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* Footer */
footer {
    padding: 4rem 2rem;
    text-align: center;
    opacity: 0.6;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .card {
        padding: 2rem;
    }
}

/* RTL Support */
[dir="rtl"] .nav-links {
    flex-direction: row-reverse;
}

[dir="rtl"] .logo {
    flex-direction: row-reverse;
}

[dir="rtl"] .theme-toggle {
    flex-direction: row-reverse;
}

[dir="rtl"] ul {
    padding-left: 0;
    padding-right: 1.5rem;
}

[dir="rtl"] .hero p {
    font-size: 1.1rem;
}

body[dir="rtl"] {
    text-align: right;
}