/* ========== LANDING PAGE (Mobile First) ========== */

html {
    scroll-behavior: smooth;
}

/* --- Navbar --- */
#nav {
    z-index: 1030;
    backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.95) !important;
    transition: box-shadow 0.3s;
}

.nav-logo {
    width: 28px;
    height: 28px;
}

.navbar-brand {
    font-size: 0.95rem;
}

/* --- Hero --- */
.hero {
    min-height: 100dvh;
    background: linear-gradient(135deg, #077944 0%, #0ba360 50%, #1ddb73 100%);
    position: relative;
    display: flex;
    align-items: center;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: url("../img/bgedu.svg") center/cover no-repeat;
    opacity: 0.1;
    pointer-events: none;
}

.hero-logo {
    width: 100px;
}

.hero-title {
    font-size: 1.75rem;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

.hero-sub {
    font-size: 0.95rem;
    opacity: 0.92;
    line-height: 1.6;
}

.hero-illustration {
    max-width: 100%;
    height: auto;
}

/* --- Sections --- */
.section-header {
    text-align: center;
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: #077944;
    display: inline-block;
    position: relative;
    margin-bottom: 0;
}

.section-title::after {
    content: "";
    display: block;
    width: 48px;
    height: 3px;
    background: linear-gradient(90deg, #077944, #1ddb73);
    margin: 6px auto 0;
    border-radius: 2px;
}

.section-sub {
    color: #6c757d;
    margin-top: 1.25rem;
    margin-bottom: 0;
    line-height: 1.5;
}

/* --- Feature card text --- */
.feature-card-title {
    font-size: 0.9rem;
    margin-bottom: 0.35rem;
    line-height: 1.3;
}

.feature-card-text {
    font-size: 0.78rem;
    line-height: 1.45;
    color: #6c757d;
}

/* --- Features --- */
.feature-card {
    border: none;
    border-radius: 14px;
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease;
    cursor: default;
    padding: 1rem !important;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(7, 121, 68, 0.1) !important;
}

.feature-icon {
    width: 44px;
    height: 44px;
    object-fit: contain;
}

.feature-icon-wrapper {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
}

/* --- Download --- */
.download-card {
    border: none;
    border-radius: 18px;
}

.download-icon-lg {
    width: 72px;
    height: 72px;
    object-fit: contain;
}

.download-btn {
    border-radius: 10px;
    padding: 12px 20px;
    font-weight: 600;
    font-size: 1rem;
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* --- Contact --- */
.contact-card {
    border: none;
    border-radius: 16px;
}

/* --- Footer --- */
.footer-landing {
    background: #065f36;
}

/* --- Download Page --- */
.download-hero {
    background: linear-gradient(135deg, #077944 0%, #0ba360 100%);
    padding-top: 72px !important;
}

.app-icon-lg {
    width: 80px;
    height: 80px;
    object-fit: contain;
    border-radius: 18px;
}

.changelog-item {
    border-left: 3px solid #198754;
    padding-left: 14px;
    margin-bottom: 10px;
}

.qr-code {
    width: 140px;
    height: 140px;
}

/* --- Utility --- */
.bg-green-soft {
    background-color: #f0faf4;
}

.text-green {
    color: #077944;
}

/* ========== TABLET (≥576px) ========== */
@media (min-width: 576px) {
    .hero-logo {
        width: 120px;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .hero-sub {
        font-size: 1.05rem;
    }

    .feature-icon {
        width: 50px;
        height: 50px;
    }

    .feature-icon-wrapper {
        width: 66px;
        height: 66px;
    }

    .download-icon-lg {
        width: 86px;
        height: 86px;
    }
}

/* ========== DESKTOP (≥768px) ========== */
@media (min-width: 768px) {
    .nav-logo {
        width: 32px;
        height: 32px;
    }

    .navbar-brand {
        font-size: 1rem;
    }

    .hero {
        min-height: 100vh;
    }

    .hero-logo {
        width: 140px;
    }

    .hero-title {
        font-size: clamp(2rem, 4vw, 3.5rem);
    }

    .hero-sub {
        font-size: clamp(1rem, 1.5vw, 1.2rem);
    }

    .section-title {
        font-size: clamp(1.5rem, 2.5vw, 2rem);
    }

    .section-title::after {
        width: 60px;
    }

    .section-sub {
        font-size: 1.05rem;
    }

    .feature-card-title {
        font-size: 1rem;
    }

    .feature-card-text {
        font-size: 0.85rem;
    }

    .feature-card {
        padding: 1.5rem !important;
    }

    .feature-icon {
        width: 56px;
        height: 56px;
    }

    .feature-icon-wrapper {
        width: 72px;
        height: 72px;
    }

    .download-icon-lg {
        width: 96px;
        height: 96px;
    }

    .download-btn {
        font-size: 1.1rem;
    }

    .app-icon-lg {
        width: 100px;
        height: 100px;
    }

    .download-card {
        max-width: 500px;
        margin: 0 auto;
    }

    .contact-card {
        max-width: 600px;
        margin: 0 auto;
    }

    .download-hero {
        padding-top: 0 !important;
    }
}