:root {
    --font-sans: 'Poppins', sans-serif;

    --light-bg: oklch(98% 0.01 240);
    --light-text: oklch(20% 0.01 240);
    --light-card-bg: oklch(100% 0 0);
    --light-accent: oklch(65% 0.15 260);
    --light-accent-text: oklch(100% 0 0);
    --light-shadow: oklch(20% 0.01 240 / 20%);

    --dark-bg: oklch(20% 0.01 240);
    --dark-text: oklch(95% 0.01 240);
    --dark-card-bg: oklch(25% 0.01 240);
    --dark-accent: oklch(75% 0.2 280);
    --dark-accent-text: oklch(15% 0.01 240);
    --dark-shadow: oklch(10% 0.01 240 / 40%);

    --bg: var(--light-bg);
    --text: var(--light-text);
    --card-bg: var(--light-card-bg);
    --accent: var(--light-accent);
    --accent-text: var(--light-accent-text);
    --shadow-color: var(--light-shadow);
}

[data-theme='dark'] {
    --bg: var(--dark-bg);
    --text: var(--dark-text);
    --card-bg: var(--dark-card-bg);
    --accent: var(--dark-accent);
    --accent-text: var(--dark-accent-text);
    --shadow-color: var(--dark-shadow);
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    box-sizing: border-box;
    margin: 0;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
    padding: 5rem 1rem 2rem;
}

.container {
    width: min(100%, 42rem);
    box-sizing: border-box;
    background-color: var(--card-bg);
    padding: 2rem 3rem;
    border-radius: 2rem;
    box-shadow: 0 25px 50px -12px var(--shadow-color);
    text-align: center;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.subtitle {
    margin-bottom: 2rem;
    opacity: 0.7;
}

.test-panel {
    display: grid;
    gap: 1.25rem;
    margin-top: 2rem;
}

.test-panel h2 {
    margin: 0;
    font-size: 1.35rem;
}

.preview-frame {
    width: min(100%, 22rem);
    aspect-ratio: 1;
    box-sizing: border-box;
    margin: 0 auto;
    border: 1px solid oklch(70% 0.02 240 / 45%);
    border-radius: 1.25rem;
    background-color: var(--bg);
    display: grid;
    place-items: center;
    overflow: hidden;
}

#upload-preview {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.empty-preview {
    opacity: 0.6;
    font-weight: 600;
}

.test-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
}

.upload-control {
    background-color: var(--accent);
    color: var(--accent-text);
    border: none;
    padding: 0.9rem 1.35rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 0.75rem;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 6px -1px var(--shadow-color);
}

.upload-control:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px var(--shadow-color);
}

#image-upload {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
}

.result-card {
    display: grid;
    gap: 0.35rem;
    padding: 1rem;
    border-radius: 1rem;
    background-color: oklch(70% 0.06 250 / 12%);
}

.result-card strong {
    font-size: 1.35rem;
}

.result-card span {
    opacity: 0.78;
}

.score-list {
    display: grid;
    gap: 0.85rem;
    text-align: left;
}

.score-row {
    display: grid;
    gap: 0.35rem;
}

.score-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    font-weight: 600;
}

.score-track {
    height: 0.65rem;
    border-radius: 999px;
    background-color: oklch(70% 0.02 240 / 28%);
    overflow: hidden;
}

.score-track span {
    display: block;
    height: 100%;
    border-radius: inherit;
    background-color: var(--accent);
    transition: width 0.25s ease;
}

/* Theme switcher */
header {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.theme-switcher input {
    display: none;
}

.theme-switcher label {
    cursor: pointer;
    display: inline-block;
    width: 50px;
    height: 28px;
    background-color: var(--card-bg);
    border-radius: 14px;
    position: relative;
    transition: background-color 0.3s ease;
    box-shadow: 0 1px 3px var(--shadow-color);
}

.theme-switcher label span {
    position: absolute;
    width: 20px;
    height: 20px;
    background-color: var(--accent);
    border-radius: 50%;
    top: 4px;
    left: 4px;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.theme-switcher input:checked + label {
    background-color: var(--accent);
}

.theme-switcher input:checked + label span {
    transform: translateX(22px);
    background-color: var(--card-bg);
}


.partnership-section {
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid oklch(75% 0.02 240 / 35%);
    text-align: left;
}

.partnership-section h2 {
    margin: 0 0 1.25rem;
    font-size: 1.35rem;
    text-align: center;
}

.partnership-form {
    display: grid;
    gap: 0.75rem;
}

.partnership-form label {
    font-size: 0.9rem;
    font-weight: 600;
}

.partnership-form input,
.partnership-form textarea {
    width: 100%;
    box-sizing: border-box;
    border: 1px solid oklch(70% 0.02 240 / 50%);
    border-radius: 0.75rem;
    background-color: var(--bg);
    color: var(--text);
    font: inherit;
    padding: 0.85rem 1rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.partnership-form textarea {
    resize: vertical;
    min-height: 8rem;
}

.partnership-form input:focus,
.partnership-form textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px oklch(65% 0.15 260 / 18%);
}

.submit-btn {
    margin-top: 0.5rem;
    background-color: var(--accent);
    color: var(--accent-text);
    border: none;
    border-radius: 0.75rem;
    cursor: pointer;
    font: inherit;
    font-weight: 600;
    padding: 0.9rem 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 6px -1px var(--shadow-color);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px var(--shadow-color);
}

.comments-section {
    width: min(100%, 42rem);
    box-sizing: border-box;
    margin: 2rem auto 0;
    padding: 2rem 3rem;
    border-radius: 2rem;
    background-color: var(--card-bg);
    box-shadow: 0 25px 50px -12px var(--shadow-color);
    text-align: left;
}

.comments-section h2 {
    margin: 0 0 1.25rem;
    font-size: 1.35rem;
    text-align: center;
}

#disqus_thread {
    min-height: 12rem;
    max-width: 100%;
}

.comments-placeholder {
    margin: 0;
    padding: 3rem 1rem;
    text-align: center;
    opacity: 0.65;
}


@media (max-width: 640px) {
    body {
        padding: 4.5rem 1rem 1.5rem;
    }

    .container,
    .comments-section {
        padding: 1.5rem;
    }
}