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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f6f7f9;
    color: #202124;
    line-height: 1.6;
}

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

header {
    padding: 44px 0 28px;
}

header h1 {
    font-size: 2.8rem;
    color: #174ea6;
    margin-bottom: 10px;
}

header p {
    font-size: 1.1rem;
    color: #5f6368;
}

main {
    display: grid;
    gap: 34px;
}

.tool-section {
    display: grid;
    gap: 16px;
}

.section-heading {
    max-width: 760px;
}

.section-heading h2 {
    font-size: 1.55rem;
    margin-bottom: 4px;
}

.section-heading p {
    color: #5f6368;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 18px;
}

.tool-card {
    background: white;
    border: 1px solid #e3e7ee;
    border-radius: 8px;
    padding: 22px;
    text-decoration: none;
    color: #202124;
    box-shadow: 0 1px 2px rgba(60, 64, 67, 0.08);
    transition: all 0.3s ease;
}

.tool-card:hover {
    transform: translateY(-2px);
    border-color: #b8c6dc;
    box-shadow: 0 8px 22px rgba(60, 64, 67, 0.12);
}

.tool-card.featured {
    border-top: 4px solid #188038;
}

.tool-tag {
    display: inline-block;
    margin-bottom: 10px;
    color: #188038;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.tool-card h2,
.tool-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: #174ea6;
}

.tool-card p {
    color: #5f6368;
    font-size: 0.95rem;
}

.tool-page {
    max-width: 920px;
    margin: 0 auto;
    padding: 20px;
}

.tool-card-container {
    background: white;
    border: 1px solid #e3e7ee;
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 1px 2px rgba(60, 64, 67, 0.08);
}

.back-link {
    display: inline-block;
    margin-bottom: 20px;
    color: #174ea6;
    text-decoration: none;
}

.back-link:hover {
    text-decoration: underline;
}

.tool-card-container h1 {
    font-size: 1.85rem;
    margin-bottom: 10px;
}

.tool-card-container h2 {
    font-size: 1.25rem;
    margin: 28px 0 10px;
}

.tool-card-container p,
.tool-card-container li {
    color: #3c4043;
}

.tool-description {
    color: #5f6368;
    margin-bottom: 26px;
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin: 22px 0;
}

.field-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 6px;
}

.field-hint {
    display: block;
    color: #6b7280;
    font-size: 0.85rem;
    margin-top: -8px;
    margin-bottom: 12px;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 14px;
    margin: 24px 0;
}

.result-card {
    background: #f8fafc;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 16px;
}

.result-card strong {
    display: block;
    color: #5f6368;
    font-size: 0.9rem;
    margin-bottom: 6px;
}

.result-card span {
    color: #174ea6;
    font-size: 1.5rem;
    font-weight: 800;
}

.content-block {
    margin-top: 28px;
}

.content-block ul {
    padding-left: 20px;
}

textarea {
    width: 100%;
    min-height: 150px;
    padding: 12px;
    border: 1px solid #d8dde6;
    border-radius: 8px;
    font-family: monospace;
    font-size: 0.95rem;
    resize: vertical;
    margin-bottom: 15px;
}

input[type="text"],
input[type="number"],
input[type="file"],
input[type="range"],
select {
    width: 100%;
    padding: 12px;
    border: 1px solid #d8dde6;
    border-radius: 8px;
    font-size: 0.95rem;
    margin-bottom: 15px;
    background: white;
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 15px;
}

button,
.download-button {
    display: inline-block;
    background-color: #174ea6;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

button:hover,
.download-button:hover {
    background-color: #0b3d91;
}

.output-container {
    margin-top: 20px;
}

.output-container textarea {
    background-color: #f8f9fa;
}

.error-text {
    color: #dc3545;
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin: 20px 0;
}

.stat-item {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: #174ea6;
}

.stat-label {
    font-size: 0.9rem;
    color: #5f6368;
}

.color-preview {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 2px solid #ddd;
    margin: 10px 0;
}

.image-preview-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 20px 0;
}

.image-preview-item {
    text-align: center;
}

.image-preview-item img {
    max-width: 100%;
    border-radius: 8px;
    margin-bottom: 10px;
}

.ad-container {
    text-align: center;
    margin: 34px 0;
    min-height: 90px;
}

footer {
    text-align: center;
    padding: 30px;
    color: #5f6368;
    font-size: 0.9rem;
}

footer a {
    color: #174ea6;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    header {
        padding: 28px 0 18px;
    }

    header h1 {
        font-size: 2rem;
    }

    .tools-grid,
    .calculator-grid,
    .image-preview-container {
        grid-template-columns: 1fr;
    }

    .tool-card-container {
        padding: 22px;
    }
}