* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #0051D5;
    --dark: #1C1C1E;
    --light-gray: #F2F2F7;
    --text-primary: #000000;
    --text-secondary: #6E6E73;
    --accent-orange: #FF9500;
    --success-green: #34C759;
}

/* latin italic */
@font-face {
  font-family: 'Inter';
  font-style: italic;
  font-weight: 100 900;
  font-display: swap;
  src: url(../fonts/inter-latin-italic.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* latin normal */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url(../fonts/inter-latin-normal.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

body {
    font-family: "Inter", sans-serif;
    font-style: normal;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--light-gray);
}

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

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

/* Header */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--text-primary);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 0.5px solid rgba(0, 0, 0, 0.3);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-orange);
    text-decoration: none;
}

.logo::before {
    content: '';
    display: inline-block;
    width: 24px;
    height: 24px;
    margin-right: 8px;
    vertical-align: middle;
    background-image: url('../images/logo-24px.jpg');
    background-size: cover;
    background-repeat: no-repeat;
}

/* Hamburger basic styling */
.hamburger {
    margin-top: 5px;
    display: none;
    flex-direction: column;
    cursor: pointer;
    width: 30px;
    height: 24px;
    justify-content: space-between;
}

.hamburger span {
    display: block;
    height: 4px;
    width: 100%;
    background: var(--primary, #036);
    border-radius: 2px;
    transition: 0.3s;
}

/* Hide checkbox */
.nav-toggle {
    display: none;
}

@media (max-width: 768px) {
    .nav-links {
        position: absolute;
        top: 60px; /* Adjust depending on header height */
        right: 0;
        left: 0;
        background: white;
        flex-direction: column;
        align-items: center;
        display: none;
        padding: 2rem 0;
        gap: 1.5rem;
        box-shadow: 0 8px 24px rgba(0,0,0,0.06);
        z-index: 10;
    }

    .nav-links li {
        width: 100%;
        text-align: center;
    }

    /* Show hamburger */
    .hamburger {
        display: flex;
        position: absolute;
        top: 18px;
        right: 24px;
        z-index: 20;
    }

    /* When checked, show menu */
    .nav-toggle:checked + .hamburger + .nav-links {
        display: flex;
    }

    /* Optionally: Animate hamburger into "X" shape */
    .nav-toggle:checked + .hamburger span:nth-child(1) {
        transform: translateY(10px) rotate(45deg);
    }
    .nav-toggle:checked + .hamburger span:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle:checked + .hamburger span:nth-child(3) {
        transform: translateY(-10px) rotate(-45deg);
    }

    /* Hide nav-links horizontal on mobile */
    nav .nav-links {
        flex-direction: column;
    }
    .nav-links {
        width: 100%;
    }
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--primary);
    text-decoration: none;
    transition: opacity 0.3s;
    font-weight: 500;
}

.nav-links a:hover {
    opacity: 0.6;
}

/* Hero Section */
.hero {
    background: var(--light-gray);
    padding: 2rem 0 4rem 0;
}

.hero-card {
    background: 
        linear-gradient(
            135deg, 
            rgba(255,149,0,0.85) 0%,    /* strong orange at the very left */
            rgba(255,149,0,0.6) 35%,    /* slightly lighter orange as we move right */
            rgba(255,149,0,0.2) 55%,    /* mostly transparent around middle */
            rgba(255,149,0,0) 60%       /* fully transparent from 75% to right */
        ),
        url('../images/hero-head.png');
    background-repeat: no-repeat;
    background-size: auto 100%;
    background-position: right bottom;
    color: black;
    padding: 3rem 2rem;
    border-radius: 20px;
    text-align: left;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

@media (max-width: 900px) {
    .hero-card {
         background: linear-gradient(135deg, 
         var(--accent-orange) 0%, 
         rgba(255,149,0,0) 100%);
    }
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: -0.5px;
}

.hero p {
    font-size: 1.1rem;
    opacity: 0.95;
    font-weight: 400;
}

.hero .cta-button-primary,
.hero .cta-button-secondary {
    margin: 1rem;
    margin-left: 0;
    margin-bottom: 0;
}

.cta-button-primary {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 0.875rem 2rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: transform 0.2s, opacity 0.2s;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.cta-button-primary:hover {
    transform: scale(1.02);
    opacity: 0.9;
}

.cta-button-secondary {
    display: inline-block;
    background: var(--light-gray);
    color: var(--primary);
    padding: 0.875rem 2rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: transform 0.2s, opacity 0.2s;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.cta-button-secondary:hover {
    transform: scale(1.02);
    opacity: 0.9;
}

.header img {
    height: 80vh;
    width: 100%;
    object-fit: cover;
}

/* Features Section */
.features {
    padding: 3rem 0;
    background: var(--light-gray);
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    letter-spacing: -0.5px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.feature-card {
    background: white;
    padding: 1.5rem;
    border-radius: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.feature-card li,
.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.feature-card li {
    margin-left: 15px;
}

/* Activities Section */
.activities {
    padding: 0;
    padding-bottom: 3rem;
    background: var(--light-gray);
}

.activity-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 2rem;
}

.activity-badge {
    background: white;
    color: var(--dark);
    padding: 0.625rem 1.25rem;
    border-radius: 5px;
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* Technical Details */
.tech-details {
    padding: 3rem 0;
    background: white;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.tech-details .tech-grid .tech-item{
    background-color: var(--light-gray);
}

.tech-item {
    background: white;
    padding: 1.25rem;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.tech-item h4 {
    color: var(--text-primary);
    margin-bottom: 0.625rem;
    font-weight: 600;
    font-size: 1.1rem;
}

.tech-item ul {
    list-style: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.tech-item ul li {
    padding-left: 1.25rem;
    position: relative;
    margin-bottom: 0.375rem;
}

.tech-item ul li:before {
    content: "•";
    color: var(--primary);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* Screenshots Section */
.screenshots {
    padding: 3rem 0;
    background: white;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.screenshot-card {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    height: 100%;
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    transition: transform 0.2s;
}

.screenshot-card img {
    order: 2;
    margin-top: auto;
    width: 100%;
    display: block;
    aspect-ratio: 9 / 19.5;
    object-fit: cover;
}

.screenshot-card:hover {
    transform: translateY(-4px);
}

.screenshot-placeholder {
    aspect-ratio: 9 / 19.5;
    background: linear-gradient(135deg, #E5E5EA 0%, #D1D1D6 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 3rem;
    position: relative;
}

.screenshot-placeholder::after {
    content: 'Screenshot';
    position: absolute;
    bottom: 2rem;
    font-size: 1rem;
    font-weight: 500;
}

.screenshot-caption {
    order: 1;
    padding: 1rem;
    text-align: center;
    margin-top: 0;
}

.screenshot-caption h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.screenshot-caption p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Privacy Section */
.privacy {
    padding: 3rem 0;
    text-align: center;
    background: var(--light-gray);
}

.privacy-content {
    max-width: 800px;
    margin: 0 auto;
}

.privacy-badge {
    display: inline-block;
    background: transparent;
    color: var(--success-green);
    border: var(--success-green) 1px solid;
    border-radius: 12px;
    padding: 0.5rem 1rem;
    margin-bottom: 1rem;
    font-weight: 400;
    font-size: 0.95rem;
    text-decoration: none;
    transition: background 0.6s ease, color 1s ease;
}
.privacy-badge:hover {
    background: var(--success-green);
    color: white;
}

/* Footer */
footer {
    background: white;
    color: var(--text-secondary);
    padding: 2rem 0;
    text-align: center;
    border-top: 0.5px solid rgba(0, 0, 0, 0.1);
}

footer p {
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.75rem;
    }

    .hero-card {
        padding: 2rem 1.5rem;
    }

    .nav-links {
        display: none;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .screenshots-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

/* Scroll animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}