/* ========== RESET & BASE ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary-blue: #0d47a1;
    --primary-dark: #1565c0;
    --primary-light: #e3f2fd;
    --secondary-green: #2ecc71;
    --secondary-purple: #9b59b6;
    --secondary-red: #e74c3c;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --background: #f8f9fa;
    --white: #ffffff;
    --border: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

body {
    background: var(--background);
    color: var(--text-dark);
    line-height: 1.5;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
}

/* ========== NAVBAR ========== */
nav {
    background: var(--white);
    padding: 12px 20px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav .logo h1 {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary-blue);
}

nav ul {
    list-style: none;
    display: flex;
    gap: 15px;
}

nav ul li a {
    text-decoration: none;
    color: var(--primary-blue);
    font-weight: 600;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

nav ul li a:hover {
    background: var(--primary-light);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 3px;
    padding: 6px;
}

.menu-toggle span {
    width: 20px;
    height: 2px;
    background: var(--primary-blue);
    border-radius: 2px;
}

/* ========== MAIN CONTAINERS ========== */
.container, .tool-container {
    max-width: 1000px;
    margin: 20px auto;
    padding: 0 20px;
}

/* ========== HEADER SECTIONS ========== */
.tool-header {
    text-align: center;
    margin-bottom: 25px;
    padding: 20px 0;
}

.tool-header h1 {
    font-size: 2rem;
    color: var(--primary-blue);
    margin-bottom: 8px;
}

.tool-header p {
    font-size: 1rem;
    color: var(--text-light);
    max-width: 500px;
    margin: 0 auto;
}

/* ========== CONTENT SECTIONS - COMPACT ========== */
.input-section, .output-section, .options-section {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 15px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.section-label {
    display: block;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

/* ========== FORM ELEMENTS - COMPACT ========== */
textarea {
    width: 100%;
    min-height: 120px;
    padding: 12px;
    font-size: 1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    resize: vertical;
    font-family: 'Consolas', 'Monaco', monospace;
    background: var(--white);
    color: var(--text-dark);
    line-height: 1.4;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(13, 71, 161, 0.1);
}

/* ========== BUTTONS - COMPACT ========== */
.action-buttons {
    display: flex;
    gap: 12px;
    margin: 20px 0;
    flex-wrap: wrap;
    justify-content: center;
}

.btn-primary, .btn-secondary, .btn-info, .btn-warning, .btn-outline, .btn-copy, .btn-convert {
    padding: 10px 18px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 140px;
}

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

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

.btn-info {
    background: var(--secondary-purple);
    color: var(--white);
}

.btn-warning {
    background: var(--secondary-red);
    color: var(--white);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-blue);
    color: var(--primary-blue);
}

.btn-copy {
    background: var(--secondary-green);
    color: var(--white);
    padding: 8px 14px;
    font-size: 0.9rem;
}

.btn-convert {
    background: var(--primary-blue);
    color: var(--white);
    width: 100%;
}

/* Button Hover Effects */
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-secondary:hover { background: #27ae60; transform: translateY(-1px); }
.btn-outline:hover { background: var(--primary-blue); color: var(--white); transform: translateY(-1px); }

/* ========== HOME PAGE - COMPACT ========== */
.home-intro {
    text-align: center;
    margin-bottom: 30px;
    padding: 25px 0;
}

.home-intro h1 {
    font-size: 2.2rem;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.home-intro h1 span {
    color: var(--primary-blue);
}

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

/* HOME TOOL CARDS - FIXED */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.tool-card {
    background: var(--white);
    border-radius: 8px;
    padding: 25px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid var(--border);
    text-decoration: none;
    display: block;
}

.tool-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.tool-card h2 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--primary-blue);
}

.tool-card p {
    color: var(--text-light);
    margin-bottom: 15px;
    line-height: 1.5;
    font-size: 0.95rem;
}

/* Home page buttons */
.tool-card button {
    width: 100%;
    padding: 10px;
    background: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
}

.tool-card button:hover {
    background: var(--primary-dark);
}

/* ========== STATS - COMPACT ========== */
.text-stats, .real-time-stats {
    display: flex;
    gap: 15px;
    margin-top: 12px;
    font-size: 0.9rem;
    color: var(--text-light);
    flex-wrap: wrap;
}

.stat-item {
    background: var(--primary-light);
    padding: 6px 12px;
    border-radius: 4px;
    font-weight: 500;
    border: 1px solid var(--border);
    font-size: 0.85rem;
}

/* ========== OPTIONS - COMPACT ========== */
.option-group {
    margin-bottom: 15px;
}

.option-group h3, .option-group h4 {
    color: var(--primary-blue);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.checkbox-option, .radio-option {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
    padding: 6px;
    border-radius: 4px;
    transition: background 0.3s ease;
    cursor: pointer;
    font-size: 0.95rem;
}

.checkbox-option:hover, .radio-option:hover {
    background: var(--primary-light);
}

.char-checkboxes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 8px;
    margin-top: 8px;
}

/* ========== CONVERTER SPECIFIC - COMPACT ========== */
.conversion-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin: 15px 0;
}

.conversion-options h3 {
    grid-column: 1 / -1;
    text-align: center;
    margin-bottom: 12px;
}

.btn-group-vertical {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.btn-description {
    font-size: 0.8rem;
    color: var(--text-light);
    text-align: center;
    margin-top: -2px;
    margin-bottom: 8px;
    line-height: 1.3;
}

/* ========== JSON SPECIFIC ========== */
.json-output {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 15px;
    border-radius: 6px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    line-height: 1.4;
    overflow-x: auto;
    max-height: 300px;
}

/* ========== FOOTER ========== */
footer {
    text-align: center;
    padding: 15px;
    background: var(--white);
    color: var(--text-light);
    margin-top: 25px;
    border-top: 1px solid var(--border);
    font-size: 0.9rem;
}

/* ========== RESPONSIVE DESIGN ========== */
@media (max-width: 768px) {
    nav ul {
        display: none;
        position: absolute;
        top: 60px;
        left: 15px;
        right: 15px;
        background: var(--white);
        flex-direction: column;
        padding: 15px;
        border-radius: 6px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }
    
    nav ul.show {
        display: flex;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .tool-header h1 {
        font-size: 1.6rem;
    }
    
    .home-intro h1 {
        font-size: 1.8rem;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary, .btn-secondary, .btn-info, .btn-warning, .btn-outline {
        width: 100%;
        max-width: 280px;
    }
    
    .conversion-options {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .input-section, .output-section, .options-section {
        padding: 15px;
    }
    
    .text-stats {
        flex-direction: column;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .tool-header h1 {
        font-size: 1.4rem;
    }
    
    .home-intro h1 {
        font-size: 1.6rem;
    }
    
    .char-checkboxes {
        grid-template-columns: 1fr;
    }
    
    .container, .tool-container {
        padding: 0 15px;
    }
}