/* ===== VARIABLES CSS ===== */
:root {
    --color-primary: #1a2847;
    --color-secondary: #00d4ff;
    --color-accent: #ff6b35;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fa;
    --color-text: #2c3e50;
    --color-text-light: #6c757d;
    --color-border: #dee2e6;
    --color-success: #28a745;

    --sidebar-width: 280px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;

    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "Monaco", "Courier New", monospace;

    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.15);

    --radius: 8px;
    --transition: 0.3s ease;
}

/* Dark Mode */
[data-theme="dark"] {
    --color-primary: #0f1923;
    --color-bg: #1a1a1a;
    --color-bg-alt: #2d2d2d;
    --color-text: #e8e8e8;
    --color-text-light: #a0a0a0;
    --color-border: #404040;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
    transition: background 0.3s, color 0.3s;
}

/* ===== SIDEBAR NAVIGATION ===== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-md);
    overflow-y: auto;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition);
}

.logo {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid rgba(255,255,255,0.1);
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.tagline {
    font-size: 0.9rem;
    opacity: 0.8;
    font-style: italic;
}

.highlight {
    color: var(--color-secondary);
    text-shadow: 0 0 20px rgba(0,212,255,0.5);
}

.highlight-orange {
    color: var(--color-accent);
    font-weight: 700;
}

.nav-menu {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.nav-menu li {
    margin-bottom: var(--spacing-xs);
}

.nav-menu a {
    display: block;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    transition: var(--transition);
    font-size: 1rem;
}

.nav-menu a:hover,
.nav-menu a.active {
    background: rgba(0,212,255,0.1);
    color: var(--color-secondary);
    transform: translateX(5px);
}

.theme-toggle {
    margin-top: auto;
}

#themeToggle {
    width: 100%;
    padding: 0.75rem;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--radius);
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

#themeToggle:hover {
    background: rgba(255,255,255,0.2);
    transform: scale(1.05);
}

.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1001;
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 0.75rem 1rem;
    font-size: 1.5rem;
    border-radius: var(--radius);
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

/* ===== MAIN CONTENT ===== */
.content {
    margin-left: var(--sidebar-width);
    padding: var(--spacing-lg);
    max-width: 1200px;
    animation: fadeIn 0.6s ease;
}

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

/* ===== HERO SECTION ===== */
.hero {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-xl);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

.strike {
    text-decoration: line-through;
    opacity: 0.5;
}

.hero-subtitle {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.25rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius);
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-secondary), #0099cc);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-large {
    padding: 1.25rem 3rem;
    font-size: 1.3rem;
}

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

.card {
    background: var(--color-bg-alt);
    padding: var(--spacing-md);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

/* ===== SECTIONS ===== */
section {
    margin-bottom: var(--spacing-xl);
}

section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

section h2::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
    border-radius: 2px;
}

/* ===== STATS ===== */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.stat {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-bg-alt);
    border-radius: var(--radius);
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 1.1rem;
    color: var(--color-text-light);
}

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

.testimonial {
    background: var(--color-bg-alt);
    padding: var(--spacing-md);
    border-radius: var(--radius);
    border-left: 4px solid var(--color-secondary);
    font-style: italic;
}

.testimonial p {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.testimonial cite {
    display: block;
    font-style: normal;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

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

.step {
    position: relative;
    padding: var(--spacing-md);
    background: var(--color-bg-alt);
    border-radius: var(--radius);
    transition: var(--transition);
}

.step:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.step-number {
    display: inline-block;
    width: 50px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
    margin-bottom: var(--spacing-sm);
}

.step h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.step a {
    color: var(--color-secondary);
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    margin-top: var(--spacing-sm);
}

.step a:hover {
    text-decoration: underline;
}

/* ===== CTA FINAL ===== */
.cta-final {
    text-align: center;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary), #0f1923);
    color: white;
    border-radius: var(--radius);
    margin-top: var(--spacing-xl);
}

.cta-final h2 {
    color: white;
}

.cta-final h2::after {
    display: none;
}

.cta-final p {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-lg);
}

/* ===== FOOTER ===== */
.footer {
    margin-left: var(--sidebar-width);
    padding: var(--spacing-md);
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.9rem;
    border-top: 1px solid var(--color-border);
}

.footer a {
    color: var(--color-secondary);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

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

    .content,
    .footer {
        margin-left: 0;
        padding: var(--spacing-md);
    }

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

    .hero-subtitle {
        font-size: 1.8rem;
    }

    section h2 {
        font-size: 2rem;
    }

    .cards,
    .testimonial-grid,
    .steps,
    .stats {
        grid-template-columns: 1fr;
    }
}

/* ===== UTILITIES ===== */
.text-center { text-align: center; }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }