/* === Reset & Base === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #2e7d32;
    --primary-dark: #1b5e20;
    --primary-light: #4caf50;
    --bg: #f5f7f5;
    --surface: #ffffff;
    --text: #1a1a1a;
    --text-secondary: #5f6368;
    --border: #dadce0;
    --error: #d32f2f;
    --radius: 12px;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    font-size: 1.8rem;
}

nav {
    display: flex;
    gap: 0.25rem;
}

nav a {
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

nav a:hover,
nav a.active {
    color: var(--primary);
    background: rgba(46, 125, 50, 0.08);
}

/* Mobile menu */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text);
    padding: 0.25rem;
}

/* === Main Content === */
.main-content {
    flex: 1;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* === Hero Section === */
.hero {
    text-align: center;
    margin-bottom: 2.5rem;
}

.hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 0.75rem;
    line-height: 1.2;
}

.hero h1 span {
    color: var(--primary);
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* === Tool Container === */
.tool-container {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    border: 1px solid var(--border);
}

.text-area-group {
    margin-bottom: 1.5rem;
}

.text-area-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.text-wrapper {
    position: relative;
}

textarea {
    width: 100%;
    min-height: 200px;
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    transition: border-color 0.2s ease;
    background: var(--bg);
    color: var(--text);
}

textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.15);
}

textarea::placeholder {
    color: #9aa0a6;
}

.word-count {
    position: absolute;
    bottom: 10px;
    right: 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--surface);
    padding: 2px 8px;
    border-radius: 4px;
    pointer-events: none;
}

/* === Button === */
.btn-primary {
    display: block;
    width: 100%;
    max-width: 320px;
    margin: 0 auto 1.5rem;
    padding: 0.875rem 2rem;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(46, 125, 50, 0.3);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* === Loading Spinner === */
.spinner {
    display: none;
    text-align: center;
    margin-bottom: 1.5rem;
}

.spinner.visible {
    display: block;
}

.spinner-ring {
    width: 36px;
    height: 36px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 0.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.spinner p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* === Output Area === */
.output-area {
    position: relative;
}

.output-area textarea {
    background: #f0f7f0;
    border-color: var(--primary-light);
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.35rem 0.75rem;
    font-size: 0.8rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    font-family: inherit;
}

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

/* === Error Message === */
.error-message {
    display: none;
    background: #fff5f5;
    border: 1px solid #ffcdd2;
    border-radius: 8px;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    color: var(--error);
    font-size: 0.9rem;
    text-align: center;
}

.error-message.visible {
    display: block;
}

/* === Features Section === */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2.5rem;
}

.feature-card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: transform 0.2s ease;
}

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

.feature-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.feature-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.feature-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* === Footer === */
.site-footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 2rem;
    margin-top: auto;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-inner p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--primary);
}

/* === Legal Pages === */
.legal-page {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.legal-page h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text);
}

.legal-page h2 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.legal-page p,
.legal-page li {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 0.75rem;
}

.legal-page ul {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.legal-page a {
    color: var(--primary);
    text-decoration: none;
}

.legal-page a:hover {
    text-decoration: underline;
}

.contact-form {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 2rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    margin-top: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.4rem;
    color: var(--text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s ease;
    background: var(--bg);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.btn-submit {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.2s ease;
}

.btn-submit:hover {
    background: var(--primary-dark);
}

/* === Responsive === */
@media (max-width: 768px) {
    .header-inner {
        height: 56px;
    }

    .menu-toggle {
        display: block;
    }

    nav {
        display: none;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        background: var(--surface);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 0.5rem;
        box-shadow: var(--shadow);
    }

    nav.open {
        display: flex;
    }

    .hero h1 {
        font-size: 1.6rem;
    }

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

    .tool-container {
        padding: 1.25rem;
    }

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

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .main-content {
        padding: 1.5rem 1rem;
    }
}