:root {
    --green: #1f7a43;
    --light-green: #e8f6ee;
    --dark: #152018;
    --muted: #5d6b61;
    --danger: #b42318;
    --card: #ffffff;
    --border: #dce8df;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(135deg, #f5fff8, #eef8f1);
    color: var(--dark);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 7%;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    backdrop-filter: blur(8px);
    z-index: 10;
}

.brand {
    font-weight: 800;
    color: var(--green);
    font-size: 1.35rem;
}

.nav-links a {
    margin-left: 20px;
    text-decoration: none;
    color: var(--dark);
    font-weight: 600;
}

.nav-links a:hover {
    color: var(--green);
}

main {
    padding: 45px 7%;
}

.hero {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 35px;
    align-items: center;
    min-height: 70vh;
}

.eyebrow {
    color: var(--green);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.85rem;
}

.hero h1,
.result-panel h1,
.content-page h1 {
    font-size: clamp(2rem, 4vw, 3.8rem);
    line-height: 1.05;
    margin: 10px 0 18px;
}

.hero p,
.content-page p {
    color: var(--muted);
    font-size: 1.08rem;
    line-height: 1.7;
}

.upload-card,
.result-panel,
.image-panel,
.content-page,
.features div {
    background: var(--card);
    border: 1px solid var(--border);
    box-shadow: 0 18px 45px rgba(28, 80, 45, 0.08);
    border-radius: 24px;
}

.upload-card {
    padding: 28px;
    animation: floatIn 0.7s ease both;
}

.upload-card h2 {
    margin-top: 0;
}

.drop-zone {
    border: 2px dashed #9fc9ad;
    background: var(--light-green);
    border-radius: 18px;
    padding: 35px 20px;
    text-align: center;
    display: block;
    cursor: pointer;
    font-weight: 700;
    color: var(--green);
}

.drop-zone input {
    display: none;
}

.preview {
    width: 100%;
    max-height: 280px;
    object-fit: cover;
    border-radius: 18px;
    margin: 18px 0;
    border: 1px solid var(--border);
}

.hidden {
    display: none;
}

button,
.secondary-btn {
    width: 100%;
    display: inline-block;
    border: none;
    background: var(--green);
    color: white;
    padding: 15px 18px;
    border-radius: 14px;
    font-size: 1rem;
    font-weight: 800;
    cursor: pointer;
    margin-top: 18px;
    text-align: center;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button:hover,
.secondary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 25px rgba(31, 122, 67, 0.25);
}

.alert {
    background: #fff1f0;
    border: 1px solid #ffccc7;
    color: var(--danger);
    padding: 12px 14px;
    border-radius: 12px;
    margin-bottom: 14px;
}

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin-top: 35px;
}

.features div {
    padding: 22px;
}

.features p {
    color: var(--muted);
    line-height: 1.6;
}

.result-layout {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 28px;
    align-items: start;
}

.image-panel {
    padding: 18px;
}

.image-panel img {
    width: 100%;
    border-radius: 18px;
    display: block;
}

.result-panel {
    padding: 30px;
}

.confidence {
    background: var(--light-green);
    color: var(--green);
    padding: 12px 14px;
    border-radius: 12px;
    display: inline-block;
    margin-bottom: 15px;
}

.cause {
    color: var(--muted);
    line-height: 1.6;
}

.result-panel li,
.content-page li {
    margin-bottom: 10px;
    line-height: 1.55;
}

details {
    margin-top: 20px;
    border-top: 1px solid var(--border);
    padding-top: 15px;
}

summary {
    cursor: pointer;
    font-weight: 800;
    color: var(--green);
}

.scores div {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
    gap: 12px;
}

.content-page {
    max-width: 900px;
    margin: auto;
    padding: 35px;
}

footer {
    padding: 20px 7%;
    color: var(--muted);
    text-align: center;
}

@keyframes floatIn {
    from {
        opacity: 0;
        transform: translateY(18px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 850px) {
    .hero,
    .features,
    .result-layout {
        grid-template-columns: 1fr;
    }

    main {
        padding: 28px 5%;
    }

    .navbar {
        padding: 16px 5%;
    }
}