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

html{
    scroll-behavior: smooth;
}

body{
    font-family: 'Segoe UI', Arial, sans-serif;
    line-height:1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

ul{
    list-style: none;
}

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

/* ===== CSS Variables ===== */
:root {
    /* Color Variables */
    ----color-primary: #2563eb;
    ----color-primary-dark: #1d4ed8;
    --color-dark: #111827;
    --color-light: #f9fafb;
    --text-color: #1f2937;
    --bg-color: #ffffff;

    /* Spacing */
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;

    /* Layout */
    --header-height: 70px;
    --max-width: 1200px;

    /* Transition */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s ease;
}

/* ===== Navbar ===== */
.navbar{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);

    display: flex;
    align-items: center;
    justify-content: space-between;

    padding: 0 var(--spacing-lg);

    background-color: transparent;
    transition: background-color var(--transition-medium),
                box-shadow var(--transition-medium);

    z-index: 1000;
}

.navbar.scrolled{
    background-color: var(--bg-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav-logo{
    font-size: 1.5rem;
    font-weight: 700;
    color: var(----color-primary);
}

.nav-menu{
    display: flex;
    gap: var(--spacing-lg);
}

.nav-menu a{
    font-weight: 500;
    position: relative;
    padding: var(--spacing-sm) 0;
    transition: color var(--transition-fast);
}

.nav-menu a:hover {
    color: var(----color-primary);
}

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

.nav-menu a:hover::after{
    width: 100%;
}


/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    width: 100%;

    padding: var(--header-height) var(--spacing-lg) 0;

    background: linear-gradient(135deg, var(--color-dark), var(----color-primary-dark));
    color: var(--color-light);
}

.hero-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

.hero-content h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: var(--spacing-md);
}

.hero-content p {
    font-size: 1.125rem;
    max-width: 500px;
    margin: 0 auto var(--spacing-lg);
    opacity: 0.9;
}

.btn-primary {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(----color-primary);
    color: white;
    border-radius: 6px;
    font-weight: 600;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

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

/* ===== Section Base ===== */
section {
    padding: var(--spacing-xl) var(--spacing-lg);

}

section h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

/* ===== About ===== */
.about {
    max-width: var(--max-width);
    margin: 0 auto;
}


.about p {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    color: #4b5563;
}

/* ===== Features ===== */
.features{
    max-width: var(--max-width);
    margin: 0 auto;
}


.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    padding: var(--spacing-lg);
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    text-align: center;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

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

/* ===== Footer ===== */
.footer {
    background-color: var(--color-dark);
    color: var(--color-light);
    text-align: center;
    padding: var(--spacing-lg);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.social-links a {
    color: var(--color-light);
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

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

/* ===== Hamburger (mobile menu button) ===== */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.hamburger .bar {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--text-color);
    border-radius: 2px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ===== Mobile Breakpoint ===== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%; /* Hidden off-screen */
        width: 70px;
        max-width: 300px;
        height: 100vh;
        

        background-color: var(--bg-color);
        box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);

        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--spacing-lg);

        transition: right var(--transition-medium);
    }

    .nav-menu.active {
        right: 0; /* Slide in when active */
    }

    .hamburger {
        display: flex; /* Show hamburger only on mobile */
    }
}

.hamburger.active .bar:nth-child(1) {
    transform: translateY(8.5px) rotate(45deg);
}

.hamburger.active .bar:nth-child(2) {
    opacity: 0;
}

.hamburger.active .bar:nth-child(3) {
    transform: translateY(-8.5px) rotate(-45deg);
}