:root {
    --bg-color: #f8f9fa;
    --container-bg: #ffffff;
    --text-color: #2d3436;
    --number-bg: #dfe6e9;
    --btn-bg: #00b894;
    --btn-hover: #00a884;
    --shadow: rgba(0, 0, 0, 0.05);
    --accent: #d63031;
    --nav-bg: #ffffff;
    --footer-bg: #2d3436;
    --footer-text: #ffffff;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #f0f0f0;
    --number-bg: #3d3d3d;
    --shadow: rgba(0, 0, 0, 0.4);
    --nav-bg: #2d2d2d;
}

* {
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    transition: background-color 0.3s ease;
    line-height: 1.6;
}

/* Navbar */
.navbar {
    background: var(--nav-bg);
    box-shadow: 0 2px 10px var(--shadow);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: background-color 0.3s ease;
}

.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--btn-bg);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 20px;
    margin: 0;
    padding: 0;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--btn-bg);
}

/* Layout */
.container {
    max-width: 1000px;
    margin: 100px auto 40px;
    padding: 0 20px;
}

.section {
    background: var(--container-bg);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow);
    margin-bottom: 40px;
    transition: background-color 0.3s ease;
}

.text-content {
    text-align: left;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.8;
    margin-bottom: 30px;
}

/* Test Area */
.test-container {
    max-width: 600px;
    margin: 0 auto;
}

.upload-area {
    border: 3px dashed var(--btn-bg);
    border-radius: 15px;
    padding: 60px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--number-bg);
    margin-bottom: 20px;
}

.upload-area:hover {
    transform: scale(1.01);
    background: var(--bg-color);
}

#face-image {
    max-width: 100%;
    max-height: 400px;
    border-radius: 10px;
    margin-bottom: 20px;
}

#predict-btn {
    background-color: var(--btn-bg);
    color: white;
    padding: 15px 40px;
    border: none;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

#predict-btn:hover {
    background-color: var(--btn-hover);
    box-shadow: 0 5px 15px rgba(0, 184, 148, 0.4);
}

/* Results */
.bar-container {
    width: 100%;
    background-color: var(--number-bg);
    border-radius: 10px;
    margin-bottom: 15px;
}

.bar {
    height: 25px;
    background-color: var(--btn-bg);
    border-radius: 10px;
}

/* Grid */
.grid-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 20px;
}

@media (max-width: 768px) {
    .grid-container { grid-template-columns: 1fr; }
    .nav-menu { display: none; }
}

/* Forms */
.form-group { margin-bottom: 20px; }
input, textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--number-bg);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-color);
}

/* Footer */
.footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 40px 0;
    margin-top: 60px;
}

.footer-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links {
    list-style: none;
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: var(--footer-text);
    text-decoration: none;
    opacity: 0.8;
}

.ad-container {
    margin: 40px 0;
    min-height: 100px;
}

#theme-btn {
    background: var(--btn-bg);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
}