:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --input-bg: #ffffff;
    --header-bg: rgba(255, 255, 255, 0.8);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --toast-bg: #1e293b;
    --toast-text: #ffffff;
}

body.dark-theme {
    --primary: #818cf8;
    --primary-hover: #6366f1;
    --bg: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --input-bg: #0f172a;
    --header-bg: rgba(15, 23, 42, 0.8);
    --shadow: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
    --toast-bg: #f1f5f9;
    --toast-text: #0f172a;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
    min-height: 100vh;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Top Bar */
.top-bar {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 0;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--primary);
}

.back-link svg {
    transition: transform 0.2s;
}

.back-link:hover svg {
    transform: translateX(-3px);
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--header-bg);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary);
}

.theme-toggle {
    background: none;
    border: 1.5px solid var(--border);
    color: var(--text-main);
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    width: 40px;
    height: 40px;
}

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

.sun-icon {
    display: none;
    width: 20px;
    height: 20px;
}

.moon-icon {
    display: block;
    width: 20px;
    height: 20px;
}

body.dark-theme .sun-icon {
    display: block;
}

body.dark-theme .moon-icon {
    display: none;
}

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

.hero {
    text-align: center;
    margin-bottom: 2.5rem;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}

.hero p {
    color: var(--text-muted);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Generator Card */
.generator-card {
    background-color: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.input-group,
.output-group {
    margin-bottom: 2rem;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

textarea {
    width: 100%;
    min-height: 150px;
    background-color: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1rem;
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    transition: border-color 0.2s, box-shadow 0.2s;
}

textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.textarea-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.quick-actions {
    display: flex;
    gap: 0.5rem;
}

.quick-actions button {
    background: none;
    border: 1px solid var(--border);
    padding: 0.4rem;
    border-radius: 0.5rem;
    cursor: pointer;
    color: var(--text-muted);
    display: flex;
    transition: all 0.2s;
}

.quick-actions button:hover {
    color: var(--primary);
    border-color: var(--primary);
}

.quick-actions svg {
    width: 18px;
    height: 18px;
}

/* Controls */
.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.btn {
    padding: 0.75rem 1.25rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    border: 1px solid transparent;
}

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

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

.btn-secondary {
    background-color: var(--card-bg);
    border-color: var(--border);
    color: var(--text-main);
}

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

/* Output */
.output-wrapper {
    position: relative;
}

.output-wrapper textarea {
    min-height: 120px;
    background-color: var(--bg);
}

.copy-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 0.4rem 0.8rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: all 0.2s;
}

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

.copy-btn svg {
    width: 16px;
    height: 16px;
}

/* Ad Container */
.ad-container {
    margin: 2rem 0;
    padding: 1rem;
    background-color: rgba(0, 0, 0, 0.02);
    border: 1px dashed var(--border);
    border-radius: 1rem;
    text-align: center;
}

body.dark-theme .ad-container {
    background-color: rgba(255, 255, 255, 0.02);
}

/* Content Section */
.content {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border);
}

.content h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--primary);
    line-height: 1.2;
}

.content h3 {
    font-size: 1.5rem;
    margin: 2.5rem 0 1rem;
    color: var(--text-main);
}

.content p {
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    font-size: 1.05rem;
}

.content a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.content a:hover {
    text-decoration: underline;
}

.feature-list,
.check-list,
.steps-list {
    margin-bottom: 2rem;
}

.feature-list,
.check-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.25rem;
}

.feature-list li,
.check-list li {
    padding: 1.5rem;
    background-color: var(--card-bg);
    border-radius: 1rem;
    border: 1px solid var(--border);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s;
}

.feature-list li:hover {
    transform: translateY(-2px);
}

.feature-list li strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

.steps-list {
    padding-left: 1.5rem;
}

.steps-list li {
    margin-bottom: 1rem;
    color: var(--text-muted);
    padding-left: 0.5rem;
}

.steps-list li::marker {
    color: var(--primary);
    font-weight: 700;
}

/* FAQ Section */
.faq-section {
    margin-top: 4rem;
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 1.5rem;
    border: 1px solid var(--border);
}

.faq-item {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.faq-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.faq-item h4 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
    color: var(--text-main);
}

.faq-item p {
    margin-bottom: 0;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--toast-bg);
    color: var(--toast-text);
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 500;
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    transform: translateY(150%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
}

.toast.show {
    transform: translateY(0);
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 640px) {
    .hero h1 {
        font-size: 2rem;
    }

    .generator-card {
        padding: 1.5rem;
    }

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