/* CSS Variables */
:root {
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --bg-card: #FFFFFF;
    --text-primary: #1A1A1A;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --border-color: #E5E7EB;
    --accent-primary: #6366F1;
    --accent-hover: #4F46E5;
    --success: #10B981;
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --gradient-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
}

[data-theme="dark"] {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-card: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-muted: #64748B;
    --border-color: #334155;
    --accent-primary: #818CF8;
    --accent-hover: #6366F1;
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

[data-theme="dark"] .header {
    background: rgba(30, 41, 59, 0.8);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.logo-icon {
    color: var(--accent-primary);
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.3s;
    color: var(--text-primary);
}

.theme-toggle:hover {
    transform: scale(1.05);
}

.moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

/* Hero */
.hero {
    padding: 3rem 0 4rem;
    position: relative;
    overflow: hidden;
}

.hero-bg-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    opacity: 0.05;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    background: var(--gradient-bg);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* Main Tool */
.main-tool {
    padding: 2rem 0 4rem;
    background: var(--bg-secondary);
}

.tool-card {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
}

.tool-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.textarea-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.textarea-label {
    font-weight: 600;
    font-size: 0.95rem;
}

.counter-group {
    display: flex;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.text-area {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    resize: vertical;
    min-height: 200px;
}

.text-area:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.icon-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--accent-primary);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.icon-button:hover {
    background: var(--accent-hover);
}

.copy-button .check-icon {
    display: none;
}

.copy-button.copied .copy-icon {
    display: none;
}

.copy-button.copied .check-icon {
    display: block;
}

/* Controls */
.controls {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
}

.control-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.25rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s;
}

.control-btn:hover {
    border-color: var(--accent-primary);
    background: var(--accent-primary);
    color: white;
}

.control-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.control-btn.secondary {
    border-color: #EF4444;
    color: #EF4444;
}

.control-btn.secondary:hover {
    background: #EF4444;
    color: white;
}

.settings-row {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.dropdown {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.dropdown-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.dropdown-select {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    cursor: pointer;
}

.info-icon {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--success);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: var(--shadow-xl);
    transform: translateY(150%);
    opacity: 0;
    transition: all 0.3s;
    z-index: 1000;
}

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

/* Tooltip */
.tooltip {
    position: fixed;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    max-width: 350px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    z-index: 1000;
}

.tooltip.show {
    opacity: 1;
}

/* Responsive */
@media (max-width: 1024px) {
    .tool-layout {
        grid-template-columns: 1fr;
    }

    .control-group {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    .nav {
        display: none;
    }

    .hero {
        padding: 2rem 0 3rem;
    }

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

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

    .main-tool {
        padding: 1.5rem 0 3rem;
    }

    .tool-card {
        padding: 1.5rem;
    }

    .text-area {
        min-height: 150px;
        font-size: 0.95rem;
    }

    .control-group {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .control-btn {
        padding: 0.75rem 0.5rem;
        font-size: 0.8rem;
        gap: 0.25rem;
    }

    .btn-icon {
        font-size: 1rem;
    }

    .settings-row {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .dropdown {
        flex-direction: column;
        align-items: stretch;
    }

    .dropdown-select {
        width: 100%;
    }

    .examples-grid,
    .faq-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .example-card,
    .faq-item {
        padding: 1.25rem;
    }

    .faq-answer {
        padding-left: 0;
        font-size: 0.9rem;
    }

    .faq-question {
        font-size: 1rem;
        gap: 0.5rem;
    }

    .faq-icon {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .section-subtitle {
        font-size: 1rem;
        padding: 0 1rem;
    }

    .social-links {
        gap: 1rem;
    }

    .social-link {
        width: 50px;
        height: 50px;
    }

    .toast {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .nav-wrapper {
        height: 60px;
    }

    .logo {
        font-size: 1.1rem;
    }

    .logo-icon {
        width: 28px;
        height: 28px;
    }

    .theme-toggle {
        width: 36px;
        height: 36px;
    }

    .hero-title {
        font-size: 1.35rem;
    }

    .tool-card {
        padding: 1rem;
        border-radius: 16px;
    }

    .textarea-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .counter-group {
        font-size: 0.8rem;
    }

    .text-area {
        padding: 0.75rem;
        min-height: 120px;
    }

    .icon-button {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .control-group {
        grid-template-columns: 1fr 1fr;
    }

    .control-btn {
        padding: 0.65rem 0.4rem;
        font-size: 0.75rem;
        flex-direction: column;
        gap: 0.15rem;
    }

    .control-btn .btn-icon {
        display: none;
    }

    .example-icon {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
    }

    .example-title {
        font-size: 1rem;
    }

    .example-desc {
        font-size: 0.85rem;
    }

    .example-demo {
        padding: 0.75rem;
        font-size: 0.8rem;
    }

    .faq-question {
        font-size: 0.95rem;
        gap: 0.4rem;
        line-height: 1.3;
    }

    .faq-icon {
        font-size: 1.1rem;
    }

    .faq-answer {
        font-size: 0.85rem;
        padding-left: 0;
        line-height: 1.6;
    }

    .faq-answer ul {
        padding-left: 1rem;
        margin-top: 0.5rem;
    }

    .faq-answer li {
        margin-bottom: 0.4rem;
    }

    .social-link {
        width: 46px;
        height: 46px;
    }

    .social-link svg {
        width: 20px;
        height: 20px;
    }
}

/* Features Section */
.features {
    padding: 4rem 0;
    background: var(--bg-primary);
}

.section-title {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.example-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    transition: all 0.3s ease;
}

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

.example-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-bg);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.example-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.example-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.example-demo {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
}

.example-input {
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.example-output {
    color: var(--accent-primary);
    font-weight: 600;
}

/* FAQ Section */
.faq {
    padding: 4rem 0;
    background: var(--bg-secondary);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.75rem;
    transition: all 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.faq-question {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    line-height: 1.4;
}

.faq-icon {
    color: var(--accent-primary);
    font-size: 1.3rem;
    flex-shrink: 0;
    margin-top: 0.1rem;
}

.faq-answer {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
    padding-left: 2rem;
}

.faq-answer ul {
    margin-top: 0.75rem;
    padding-left: 1.25rem;
    list-style-type: disc;
}

.faq-answer li {
    margin-bottom: 0.5rem;
    padding-left: 0.25rem;
}

/* Social Section */
.social-section {
    padding: 4rem 0;
    background: var(--bg-primary);
    text-align: center;
}

.social-content {
    max-width: 600px;
    margin: 0 auto;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.social-link {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 1.5rem;
}

.social-link:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    background: var(--accent-primary);
    color: white;
    box-shadow: var(--shadow-lg);
}

/* Footer */
.footer {
    padding: 2rem 0;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}