/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Light Theme */
    --primary: #1877f2;
    --primary-dark: #166fe5;
    --secondary: #42b72a;
    --dark: #1c1e21;
    --light: #f0f2f5;
    --white: #ffffff;
    --gray-100: #f5f7fa;
    --gray-200: #e4e6eb;
    --gray-300: #dadde1;
    --gray-400: #b0b3b8;
    --gray-500: #8a8d91;
    --gray-600: #65676b;
    --gray-700: #4b4c4f;
    --gray-800: #3a3b3c;
    --gray-900: #242526;
    --text: #050505;
    --text-secondary: #65676b;
    --border: #dddfe2;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
}

.dark-theme {
    --primary: #2d88ff;
    --primary-dark: #1a6ed8;
    --secondary: #31a24c;
    --dark: #18191a;
    --light: #242526;
    --white: #3a3b3c;
    --gray-100: #242526;
    --gray-200: #3a3b3c;
    --gray-300: #4a4b4c;
    --gray-400: #6d6e70;
    --gray-500: #8a8d91;
    --gray-600: #b0b3b8;
    --gray-700: #cfd1d5;
    --gray-800: #e4e6eb;
    --gray-900: #f0f2f5;
    --text: #e4e6eb;
    --text-secondary: #b0b3b8;
    --border: #4a4b4c;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--light);
    color: var(--text);
    line-height: 1.5;
    transition: var(--transition);
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    line-height: 1.2;
}

/* ===== HEADER ===== */
.main-header {
    background-color: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon i {
    font-size: 24px;
    color: white;
}

.logo-text h1 {
    font-size: 20px;
    color: var(--primary);
    margin-bottom: 2px;
}

.logo-text p {
    font-size: 12px;
    color: var(--text-secondary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--gray-100);
    border: 1px solid var(--border);
    color: var(--text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.theme-toggle:hover {
    background-color: var(--gray-200);
}

.home-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.home-link:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

/* ===== ADSENSE CONTAINERS ===== */
.ad-container {
    margin: 24px 0;
    padding: 16px;
    background-color: var(--white);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.ad-top, .ad-bottom {
    margin: 24px auto;
}

.ad-card {
    background-color: var(--white);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid var(--border);
    min-height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== HERO SECTION ===== */
.hero-section {
    text-align: center;
    padding: 40px 0;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 32px;
    margin-bottom: 16px;
    color: var(--text);
}

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== TOOL GRID ===== */
.tool-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin: 40px 0;
}

@media (max-width: 992px) {
    .tool-grid {
        grid-template-columns: 1fr;
    }
    .ad-card {
        min-height: 250px;
    }
}

/* ===== CARDS ===== */
.tool-card, .result-card {
    background-color: var(--white);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.tool-card:hover, .result-card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    padding: 24px 24px 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}

.card-header i {
    color: var(--primary);
    font-size: 20px;
}

.card-header h3 {
    font-size: 18px;
    color: var(--text);
}

.card-body {
    padding: 24px;
}

.card-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 12px;
    background-color: var(--gray-100);
}

/* ===== INPUT STYLES ===== */
.input-wrapper {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.input-wrapper input {
    flex: 1;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: 'Inter', sans-serif;
    background-color: var(--white);
    color: var(--text);
    transition: var(--transition);
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(24, 119, 242, 0.1);
}

.input-tips {
    background-color: var(--gray-100);
    padding: 16px;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--primary);
}

.input-tips p {
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text);
}

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

.examples span {
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 13px;
    color: var(--text-secondary);
    padding: 4px 8px;
    background-color: var(--white);
    border-radius: 4px;
    border: 1px solid var(--border);
}

/* ===== BUTTONS ===== */
.btn-primary, .btn-secondary, .btn-copy {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--gray-200);
    color: var(--text);
}

.btn-secondary:hover {
    background-color: var(--gray-300);
}

.btn-copy {
    background-color: var(--secondary);
    color: white;
    padding: 10px 16px;
}

.btn-copy:hover {
    background-color: #36a420;
}

/* ===== RESULT STYLES ===== */
.result-placeholder {
    text-align: center;
    padding: 40px 20px;
}

.placeholder-icon {
    font-size: 48px;
    color: var(--border);
    margin-bottom: 16px;
}

.result-placeholder p {
    color: var(--text-secondary);
}

.uid-result {
    margin-bottom: 24px;
}

.uid-label {
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text);
}

.uid-value-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.uid-value {
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 20px;
    font-weight: 600;
    color: var(--primary);
    padding: 12px 16px;
    background-color: var(--gray-100);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    flex: 1;
    min-width: 200px;
    word-break: break-all;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background-color: var(--gray-100);
    border-radius: var(--radius-sm);
}

.avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    flex-shrink: 0;
}

.user-details {
    flex: 1;
}

.user-name {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}

.profile-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

.profile-link:hover {
    text-decoration: underline;
}

/* ===== INFO GRID ===== */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin: 40px 0;
}

.info-card {
    background-color: var(--white);
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    text-align: center;
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.info-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin: 0 auto 16px;
}

.info-card h4 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--text);
}

.info-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

/* ===== FAQ SECTION ===== */
.faq-section {
    margin: 60px 0;
    padding: 40px;
    background-color: var(--white);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.faq-section h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    margin-bottom: 32px;
    color: var(--text);
}

.faq-section h3 i {
    color: var(--primary);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.faq-item {
    background-color: var(--gray-100);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.faq-question {
    padding: 16px 20px;
    background-color: var(--primary);
    color: white;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.faq-question:hover {
    background-color: var(--primary-dark);
}

.faq-answer {
    padding: 20px;
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 14px;
}

/* ===== FOOTER ===== */
.main-footer {
    background-color: var(--dark);
    color: var(--gray-500);
    padding: 40px 0;
    margin-top: 60px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 40px;
    flex-wrap: wrap;
}

.footer-info {
    flex: 1;
    min-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
    color: white;
    margin-bottom: 16px;
}

.footer-logo i {
    color: var(--primary);
}

.footer-description {
    margin-bottom: 20px;
    line-height: 1.6;
    font-size: 14px;
    color: var(--gray-500);
}

.copyright {
    font-size: 12px;
    color: var(--gray-600);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-width: 200px;
}

.footer-link {
    color: var(--gray-500);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    transition: var(--transition);
}

.footer-link:hover {
    color: white;
}

/* ===== NOTIFICATION ===== */
.notification {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--secondary);
    color: white;
    padding: 16px 24px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    transform: translateY(100px);
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    z-index: 1000;
    max-width: 350px;
}

.notification.show {
    transform: translateY(0);
    opacity: 1;
}

.notification-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.notification-content i {
    font-size: 20px;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 24px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .header-content {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }
    
    .logo {
        justify-content: center;
        text-align: center;
    }
    
    .header-actions {
        justify-content: center;
    }
    
    .input-wrapper {
        flex-direction: column;
    }
    
    .uid-value-wrapper {
        flex-direction: column;
        align-items: stretch;
    }
    
    .uid-value {
        min-width: unset;
        font-size: 18px;
    }
    
    .user-info {
        flex-direction: column;
        text-align: center;
    }
    
    .faq-section {
        padding: 24px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        align-items: center;
    }
    
    .notification {
        left: 20px;
        right: 20px;
        bottom: 20px;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .card-header, .card-body, .card-footer {
        padding: 16px;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .faq-grid {
        grid-template-columns: 1fr;
    }
}