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

:root {
    /* DEFAULT THEME (Gradient) */
    --bg-body: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-card: rgba(255, 255, 255, 0.95);
    --bg-header: rgba(255, 255, 255, 0.1);
    --bg-footer: rgba(0, 0, 0, 0.2);

    --text-primary: #FFFFFF;
    /* For dark backgrounds (body) */
    --text-card: #2D3748;
    /* For white cards in this theme */
    --text-secondary: rgba(255, 255, 255, 0.9);
    --text-muted: #718096;
    --text-logo: #FFFFFF;

    --btn-primary-bg: #FFFFFF;
    --btn-primary-text: #6b46c1;
    --btn-secondary-bg: rgba(255, 255, 255, 0.15);
    --btn-secondary-border: rgba(255, 255, 255, 0.3);
    --btn-secondary-text: #FFFFFF;

    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-card: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --backdrop-blur: 12px;
}

[data-theme="clean"] {
    /* CLEAN THEME (White/Black) */
    --bg-body: #FFFFFF;
    --bg-card: #FFFFFF;
    --bg-header: rgba(255, 255, 255, 0.9);
    --bg-footer: #FAFAFA;

    --text-primary: #000000;
    --text-card: #2D3748;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --text-logo: #000000;

    --btn-primary-bg: #000000;
    --btn-primary-text: #FFFFFF;
    --btn-secondary-bg: #FFFFFF;
    --btn-secondary-border: #E2E8F0;
    --btn-secondary-text: #000000;

    --border-color: #E2E8F0;
    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --backdrop-blur: 0px;
}

[data-theme="dark"] {
    /* DARK THEME */
    --bg-body: #1a202c;
    /* Slate 900 */
    --bg-card: #2d3748;
    /* Slate 800 */
    --bg-header: rgba(26, 32, 44, 0.9);
    --bg-footer: #171923;

    --text-primary: #f7fafc;
    --text-card: #f7fafc;
    /* Cards are dark, text must be light */
    --text-secondary: #e2e8f0;
    --text-muted: #a0aec0;
    --text-logo: #f7fafc;

    --btn-primary-bg: #805ad5;
    /* Purple 500 */
    --btn-primary-text: #FFFFFF;
    --btn-secondary-bg: #2d3748;
    --btn-secondary-border: #4a5568;
    --btn-secondary-text: #f7fafc;

    --border-color: #4a5568;
    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.18);
    --backdrop-blur: 0px;
    /* Solid dark preferred for contrast or low blur */
}

/* Improved Theme Toggle Button */
.theme-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(4px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.theme-toggle:hover {
    background: var(--bg-card);
    color: var(--text-primary);
    transform: rotate(15deg) scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* Specific overrides for cleaner look in nav */
nav .theme-toggle {
    margin: 0 8px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-secondary);
    background: var(--bg-body);
    background-attachment: fixed;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    transition: background 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--white);
    letter-spacing: -0.5px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

nav {
    display: flex;
    gap: 32px;
    align-items: center;
}

nav a {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.9);
    font-size: 15px;
    font-weight: 500;
    transition: all 0.2s;
}

nav a:hover {
    color: var(--white);
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.4);
}


/* ... (Header and root vars are already correct) ... */

/* Buttons */
.btn-primary {
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    /* Matching the purple in gradient */
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 15px;
    font-weight: 700;
    transition: all 0.2s;
    display: inline-block;
    box-shadow: 0 4px 14px 0 rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
    opacity: 0.9;
}

.btn-secondary {
    background: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    padding: 12px 24px;
    border-radius: 8px;
    border: 1px solid var(--btn-secondary-border);
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.2s;
    display: inline-block;
    backdrop-filter: blur(4px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

/* ... */

/* Hero */
.hero h1 {
    font-size: 72px;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -2px;
    margin-bottom: 24px;
    color: var(--text-primary);
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.subtitle {
    font-size: 22px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    line-height: 1.6;
    font-weight: 400;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.price-hint {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
    opacity: 0.8;
}

/* Features */
.features h2 {
    text-align: center;
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -1.5px;
    margin-bottom: 64px;
    color: var(--text-primary);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background: var(--bg-card);
    padding: 40px 32px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-card);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.feature-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-card);
    /* Consistent dynamic color */
}

.feature-card p {
    color: var(--text-muted);
    margin-bottom: 24px;
    font-size: 16px;
    line-height: 1.7;
}

/* Pricing */
.pricing h2 {
    text-align: center;
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -1.5px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 64px;
    font-size: 18px;
}

.pricing-card {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 40px 32px;
    position: relative;
    transition: all 0.3s;
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-card);
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.pricing-card .btn-primary {
    width: 100%;
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #FFFFFF;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.pricing-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-card);
    /* Consistent dynamic color */
}

.price-amount {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text-card);
    /* Consistent dynamic color */
    letter-spacing: -2px;
}

/* Footer */
footer {
    background: var(--bg-footer);
    padding: 80px 0 40px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    backdrop-filter: blur(10px);
}

.footer-brand p {
    color: var(--text-muted);
    margin-top: 16px;
    font-size: 15px;
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    margin-bottom: 14px;
    transition: all 0.2s;
}

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 14px;
}

/* 
 * ==========================================
 * SHARED COMPONENT STYLES (Auth/Dashboard)
 * ==========================================
 */

.login-container,
.register-container {
    background: var(--bg-card);
    padding: 50px 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-card);
    width: 100%;
    backdrop-filter: blur(var(--backdrop-blur));
    border: 1px solid var(--border-color);
}

.login-container {
    max-width: 420px;
}

.register-container {
    max-width: 480px;
    padding: 40px;
}

.auth-title {
    font-size: 32px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 8px;
    color: var(--text-logo);
}

/* Gradient text effect for default/gradient theme */
:root .auth-title {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

[data-theme] .auth-title {
    background: none;
    -webkit-text-fill-color: initial;
    color: var(--text-logo);
}

.auth-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 32px;
    font-size: 16px;
    font-weight: 500;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-card);
    font-weight: 600;
    font-size: 14px;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 15px;
    transition: all 0.2s;
    font-family: 'Inter', sans-serif;
    background: #f8fafc;
    color: #2D3748;
}

[data-theme="dark"] .form-group input {
    background: #2d3748;
    border-color: #4a5568;
    color: #f7fafc;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn-block {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #FFFFFF;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

[data-theme="clean"] .btn-block {
    background: #000000;
    color: #FFFFFF;
}

[data-theme="dark"] .btn-block {
    background: #805ad5;
    color: #FFFFFF;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    color: var(--text-muted);
    font-size: 14px;
}

.auth-footer a {
    color: #667eea;
    text-decoration: none;
    font-weight: 700;
}

/* Dashboard Specifics */
.dashboard-header {
    background: var(--bg-card);
    backdrop-filter: blur(var(--backdrop-blur));
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-card);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding: 20px 32px;
    border-radius: 16px;
}

.dashboard-logo {
    font-size: 24px;
    font-weight: 800;
    background: var(--primary-gradient);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

[data-theme] .dashboard-logo {
    background: none;
    -webkit-text-fill-color: initial;
    color: var(--text-logo);
}

.username-display {
    font-weight: 700;
    color: var(--text-card);
}

.welcome-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-card);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-card);
    margin-bottom: 30px;
}

.welcome-card h1 {
    color: var(--text-card);
}

.welcome-card p {
    color: var(--text-muted);
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow-card);
}

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 5px;
}

.stat-label {
    color: var(--text-muted);
    font-size: 14px;
}

.content-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-card);
    padding: 30px;
    border-radius: 16px;
}

.content-section h2 {
    color: var(--text-card);
    margin-bottom: 20px;
}

.theme-item {
    background: var(--bg-body);
    /* fallback */
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

[data-theme="dark"] .theme-item {
    background: #2d3748;
}

.theme-info h3 {
    color: var(--text-card);
}

.theme-meta {
    color: var(--text-muted);
}

/* Password Requirements */
.password-requirements {
    background: #f7fafc;
    border-radius: 8px;
    padding: 16px;
    margin-top: 12px;
    font-size: 13px;
    border: 1px solid #edf2f7;
}

[data-theme="dark"] .password-requirements {
    background: #2d3748;
    border-color: #4a5568;
}

.password-requirements h4 {
    color: var(--text-card);
    font-size: 13px;
    margin-bottom: 8px;
    font-weight: 700;
}

.requirement {
    display: flex;
    align-items: center;
    margin: 6px 0;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 48px;
    }

    .subtitle {
        font-size: 18px;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .btn-large {
        width: 100%;
        text-align: center;
    }

    .feature-grid,
    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    nav {
        display: none;
        /* TODO: Add mobile menu if needed, simplified for now */
    }

    header .container {
        justify-content: center;
    }
}