:root {
    --bg: #f4f6fb;
    --text: #1f2933;
    --card: #ffffff;
    --muted: #6b7280;
    --button-bg: #4CAF50;
    --button-bg-hover: #45a049;
    --button-text: #ffffff;
    --shadow: 0 6px 18px rgba(15, 23, 42, 0.12);
    --number-text: #111111;
}

body[data-theme="dark"] {
    --bg: #0f172a;
    --text: #e2e8f0;
    --card: #111827;
    --muted: #94a3b8;
    --button-bg: #22c55e;
    --button-bg-hover: #16a34a;
    --button-text: #0b1120;
    --shadow: 0 10px 24px rgba(0, 0, 0, 0.45);
    --number-text: #0b0b0b;
}

body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: radial-gradient(circle at top, rgba(99, 102, 241, 0.12), transparent 50%),
        linear-gradient(135deg, var(--bg), color-mix(in srgb, var(--bg) 85%, #ffffff));
    color: var(--text);
    transition: background-color 0.25s ease, color 0.25s ease;
    padding: 40px 16px;
}

.container {
    text-align: center;
    padding: 32px 36px 40px;
    background-color: var(--card);
    border-radius: 20px;
    box-shadow: var(--shadow);
    width: min(920px, 100%);
    transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

.header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

#theme-toggle {
    border: 1px solid color-mix(in srgb, var(--text) 20%, transparent);
    background: transparent;
    color: var(--text);
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 14px;
    cursor: pointer;
    transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

#theme-toggle:hover {
    background-color: color-mix(in srgb, var(--text) 10%, transparent);
}

.eyebrow {
    font-size: 12px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 6px;
}

h1 {
    font-size: 34px;
    margin: 0;
    color: var(--text);
}

.subtitle {
    color: var(--muted);
    margin: 6px 0 24px;
}

.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-bottom: 28px;
}

.nav a {
    text-decoration: none;
    color: var(--text);
    font-size: 14px;
    padding: 6px 10px;
    border-radius: 999px;
    border: 1px solid color-mix(in srgb, var(--text) 10%, transparent);
}

.nav a:hover {
    background-color: color-mix(in srgb, var(--text) 8%, transparent);
}

.tester {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.camera-card,
.result-card,
.upload-card {
    padding: 20px;
    border-radius: 16px;
    background-color: color-mix(in srgb, var(--card) 92%, #ffffff);
    border: 1px solid color-mix(in srgb, var(--text) 8%, transparent);
    box-shadow: var(--shadow);
    text-align: left;
}

.webcam {
    width: 100%;
    aspect-ratio: 1 / 1;
    background: color-mix(in srgb, var(--bg) 90%, #000000);
    border-radius: 16px;
    overflow: hidden;
    display: grid;
    place-items: center;
}

.image-preview {
    width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: 16px;
    background: color-mix(in srgb, var(--bg) 90%, #000000);
    border: 1px dashed color-mix(in srgb, var(--text) 25%, transparent);
    display: grid;
    place-items: center;
    color: var(--muted);
    font-size: 14px;
    overflow: hidden;
}

.image-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

#image-input {
    margin-top: 12px;
}

.controls {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.controls button {
    flex: 1;
    padding: 12px 14px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    font-size: 14px;
    background-color: var(--button-bg);
    color: var(--button-text);
}

.controls button:hover:not(:disabled) {
    background-color: var(--button-bg-hover);
}

.controls button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.hint {
    margin-top: 12px;
    color: var(--muted);
    font-size: 12px;
}

.consent {
    display: flex;
    gap: 8px;
    align-items: flex-start;
    margin-top: 12px;
    color: var(--muted);
    font-size: 12px;
}

.consent input {
    margin-top: 2px;
}

.result-card h2 {
    margin-top: 0;
    font-size: 20px;
}

.result-main {
    font-size: 26px;
    font-weight: 700;
    margin: 12px 0 16px;
}

.label-list {
    display: grid;
    gap: 8px;
    color: var(--text);
    font-size: 14px;
}

.content {
    margin-top: 32px;
    text-align: left;
}

.content h2 {
    margin-bottom: 12px;
    font-size: 20px;
}

.content p {
    color: var(--text);
}

.bullets,
.steps {
    margin: 12px 0 0;
    padding-left: 18px;
    color: var(--muted);
}

.qa {
    margin-bottom: 12px;
    padding: 12px 14px;
    border-radius: 12px;
    background-color: color-mix(in srgb, var(--card) 94%, #ffffff);
    border: 1px solid color-mix(in srgb, var(--text) 8%, transparent);
}

.qa h3 {
    margin: 0 0 6px;
    font-size: 16px;
}

.qa p {
    margin: 0;
    color: var(--muted);
}

.contact {
    margin-top: 36px;
    text-align: left;
    color: var(--text);
}

.contact h2 {
    font-size: 20px;
    margin-bottom: 12px;
}

.contact form {
    display: grid;
    gap: 12px;
}

.contact input,
.contact textarea {
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid color-mix(in srgb, var(--text) 18%, transparent);
    background-color: color-mix(in srgb, var(--card) 92%, #ffffff);
    color: var(--text);
    font-size: 14px;
}

.contact input:focus,
.contact textarea:focus {
    outline: 2px solid color-mix(in srgb, var(--button-bg) 65%, transparent);
    border-color: transparent;
}

.contact button {
    justify-self: start;
    padding: 12px 18px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    background-color: var(--button-bg);
    color: var(--button-text);
    font-size: 14px;
}

.contact button:hover {
    background-color: var(--button-bg-hover);
}

.comments {
    margin-top: 36px;
    text-align: left;
    color: var(--text);
}

.comments h2 {
    font-size: 20px;
    margin-bottom: 12px;
}