/* CSS Variables for Theme Support */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #ec4899;
    --background: #ffffff;
    --surface: #f9fafb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --success: #10b981;
    --danger: #ef4444;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-lg: rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
    --primary-color: #818cf8;
    --primary-dark: #6366f1;
    --secondary-color: #f472b6;
    --background: #111827;
    --surface: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --border-color: #374151;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.5);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* Header */
.header {
    background-color: var(--surface);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px var(--shadow);
}

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

.logo h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.logo-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.logo h1 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 0;
}

.nav a:hover,
.nav a.active {
    color: var(--primary-color);
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 3rem 0;
    text-align: center;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 800;
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.95;
}

/* Ad Placeholders */
.ad-placeholder {
    background-color: var(--surface);
    border: 2px dashed var(--border-color);
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    margin: 2rem auto;
    max-width: 1200px;
    border-radius: 8px;
}

.ad-top {
    min-height: 90px;
}

.ad-content {
    min-height: 250px;
}

.ad-bottom {
    min-height: 90px;
}

/* Main Content */
.main-content {
    padding: 3rem 0;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.tool-card {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px var(--shadow-lg);
}

.tool-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.tool-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.tool-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

/* Buttons */
.btn {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    min-width: 120px;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: scale(1.05);
}

.btn-secondary {
    background-color: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-large {
    padding: 1.25rem 3rem;
    font-size: 1.25rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    overflow-y: auto;
}

.modal-content {
    background-color: var(--background);
    margin: 2% auto;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 90%;
    max-width: 900px;
    box-shadow: 0 20px 60px var(--shadow-lg);
    position: relative;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.close {
    position: absolute;
    right: 1.5rem;
    top: 1rem;
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-secondary);
    cursor: pointer;
    z-index: 1001;
    transition: color 0.3s ease;
}

.close:hover {
    color: var(--danger);
}

/* Tool Interfaces */
.tool-interface {
    padding: 2rem;
}

.tool-interface h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.tool-interface p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: 0.875rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--surface);
    color: var(--text-primary);
    transition: border-color 0.3s ease;
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.input-group textarea {
    min-height: 120px;
    resize: vertical;
}

.options-list {
    list-style: none;
    margin-bottom: 1.5rem;
}

.option-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.5rem;
}

.option-item input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 1rem;
    color: var(--text-primary);
}

.option-item button {
    background-color: var(--danger);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.option-item button:hover {
    background-color: #dc2626;
}

/* Wheel Container */
.wheel-container {
    position: relative;
    width: 100%;
    max-width: 500px;
    margin: 2rem auto;
    aspect-ratio: 1;
}

#wheelCanvas {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    box-shadow: 0 10px 30px var(--shadow-lg);
}

.wheel-pointer {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 3rem;
    z-index: 10;
    filter: drop-shadow(0 4px 8px var(--shadow));
}

/* Result Display */
.result-display {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    margin: 2rem 0;
    animation: resultFadeIn 0.5s ease;
}

@keyframes resultFadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.result-display h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.result-display .result-value {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

/* History Section */
.history-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: var(--surface);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.history-section h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.history-list {
    list-style: none;
}

.history-item {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-item:last-child {
    border-bottom: none;
}

.history-time {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* FAQ Section */
.faq-section {
    padding: 3rem 0;
    background-color: var(--surface);
}

.faq-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.faq-item {
    background-color: var(--background);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.faq-item h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

.faq-item p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Footer */
.footer {
    background-color: var(--surface);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 1.5rem;
    margin-top: 3rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* Content Pages */
.content-page {
    padding: 3rem 0;
}

.content-page h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.content-page h2 {
    font-size: 1.75rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.content-page p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.content-page ul {
    margin-left: 2rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.content-page ul li {
    margin-bottom: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h2 {
        font-size: 1.75rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .tools-grid {
        grid-template-columns: 1fr;
    }

    .nav {
        width: 100%;
        justify-content: center;
        margin-top: 1rem;
    }

    .logo-img {
        width: 35px;
        height: 35px;
    }

    .logo h1 {
        font-size: 1.25rem;
    }

    .modal-content {
        width: 95%;
        margin: 5% auto;
    }

    .tool-interface {
        padding: 1.5rem;
    }

    .btn-large {
        padding: 1rem 2rem;
        font-size: 1.1rem;
    }

    .result-display .result-value {
        font-size: 2rem;
    }

    .faq-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .logo h1 {
        font-size: 1.1rem;
    }

    .logo-img {
        width: 30px;
        height: 30px;
    }

    .hero {
        padding: 2rem 0;
    }

    .hero h2 {
        font-size: 1.5rem;
    }

    .tool-card {
        padding: 1.5rem;
    }

    .tool-icon {
        font-size: 2.5rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }

    .close {
        right: 1rem;
        top: 0.5rem;
    }
}

/* Loading Animation */
.spinner {
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus Styles */
button:focus,
input:focus,
textarea:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}