:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --container-bg: rgba(255, 255, 255, 0.95);
    --text-color: #1f2937;
    --heading-color: #111827;
    --btn-secondary-bg: #ffffff;
    --btn-secondary-text: #4b5563;
    --btn-secondary-border: #e5e7eb;
    --btn-secondary-hover: #f9fafb;
    --glass-border: rgba(255, 255, 255, 0.5);
    --bar-bg: #e5e7eb;
}

[data-theme="dark"] {
    --bg-gradient: linear-gradient(135deg, #111827 0%, #1f2937 100%);
    --container-bg: rgba(31, 41, 55, 0.95);
    --text-color: #f9fafb;
    --heading-color: #ffffff;
    --btn-secondary-bg: #374151;
    --btn-secondary-text: #f3f4f6;
    --btn-secondary-border: #4b5563;
    --btn-secondary-hover: #4b5563;
    --glass-border: rgba(255, 255, 255, 0.1);
    --bar-bg: #4b5563;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg-gradient);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    transition: background 0.3s ease;
}

.container {
    text-align: center;
    padding: 2.5rem;
    background: var(--container-bg);
    backdrop-filter: blur(20px);
    border-radius: 32px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    width: 90%;
    max-width: 550px;
    border: 1px solid var(--glass-border);
    margin: 2rem 0;
}

header {
    margin-bottom: 2.5rem;
    position: relative;
}

h1 {
    font-size: 2.25rem;
    margin-bottom: 0.5rem;
    color: var(--heading-color);
    letter-spacing: -0.025em;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.7;
}

.theme-controls {
    position: absolute;
    top: -10px;
    right: -10px;
}

.test-area {
    margin-bottom: 2rem;
}

.upload-container {
    width: 100%;
    max-width: 320px;
    margin: 0 auto 1.5rem;
    cursor: pointer;
}

.image-preview {
    width: 100%;
    aspect-ratio: 1/1;
    background: var(--btn-secondary-bg);
    border-radius: 24px;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 3px dashed var(--btn-secondary-border);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.image-preview:hover {
    border-color: var(--primary-color);
    transform: scale(1.02);
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    opacity: 0.5;
    color: var(--text-color);
}

#face-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.loading-spinner {
    margin-top: 1rem;
    font-weight: 600;
    color: var(--primary-color);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.action-btn-group {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.primary-btn {
    background: var(--primary-color);
    color: #fff;
    border: none;
    padding: 0.875rem 2.5rem;
    font-size: 1.125rem;
    font-weight: 700;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.4);
}

.primary-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px rgba(99, 102, 241, 0.4);
}

.secondary-btn {
    background: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    border: 1px solid var(--btn-secondary-border);
    padding: 0.75rem 1.25rem;
    border-radius: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.secondary-btn:hover {
    background: var(--btn-secondary-hover);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.result-area {
    background: var(--btn-secondary-bg);
    padding: 1.75rem;
    border-radius: 24px;
    margin-top: 1.5rem;
    border: 1px solid var(--btn-secondary-border);
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-area h3 {
    margin-bottom: 1.25rem;
    font-size: 1.25rem;
    color: var(--heading-color);
}

.label-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-align: left;
}

.result-label-box {
    display: flex;
    justify-content: space-between;
    font-weight: 700;
    font-size: 0.95rem;
}

.progress-bar-bg {
    width: 100%;
    height: 12px;
    background: var(--bar-bg);
    border-radius: 100px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: var(--primary-color);
    border-radius: 100px;
    transition: width 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.divider {
    border: 0;
    height: 1px;
    background: var(--btn-secondary-border);
    margin: 2.5rem 0;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    text-align: left;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 600;
    opacity: 0.8;
}

.form-group input, .form-group textarea {
    padding: 0.875rem 1rem;
    border-radius: 12px;
    border: 1px solid var(--btn-secondary-border);
    background: var(--btn-secondary-bg);
    color: var(--text-color);
    font-family: inherit;
    transition: all 0.2s;
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.submit-btn {
    background: var(--heading-color);
    color: #fff;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 700;
    transition: all 0.2s;
}

.submit-btn:hover {
    transform: scale(0.98);
    opacity: 0.9;
}

@media (max-width: 480px) {
    .container { padding: 1.5rem; }
    h1 { font-size: 1.75rem; }
}