/* CSV Master - Clean Light Mode Styles */

:root {
    /* Light Mode Colors - Crisp & Clean */
    --bg-main: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border-light: #e9ecef;
    --border-medium: #dee2e6;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #eef2ff;
    --success: #10b981;
    --success-light: #d1fae5;
    --error: #ef4444;
    --error-light: #fee2e2;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header Styles - Clean & Modern */
header {
    background: var(--bg-main);
    border-bottom: 1px solid var(--border-light);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    backdrop-filter: blur(10px);
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
}

.logo img {
    width: 40px;
    height: 40px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

nav a:hover {
    color: var(--primary);
}

/* Button Styles - Clean & Modern */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

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

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-medium);
}

.btn-secondary:hover {
    background: var(--border-light);
    box-shadow: var(--shadow-sm);
}

.btn-success {
    background: var(--success);
}

.btn-success:hover {
    background: #059669;
}

/* Card Styles - Clean with subtle shadow */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 0.75rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

/* Upload Area - Clean & Inviting */
.upload-area {
    border: 2px dashed var(--border-medium);
    border-radius: 0.75rem;
    padding: 3rem 2rem;
    text-align: center;
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.upload-area:hover {
    border-color: var(--primary);
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.upload-area.drag-over {
    border-color: var(--primary);
    background: var(--primary-light);
    border-style: solid;
    box-shadow: var(--shadow-lg);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.6;
    color: var(--text-secondary);
}

/* Progress Indicator */
.progress-container {
    width: 100%;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    overflow: hidden;
    margin: 1rem 0;
}

.progress-bar {
    height: 0.5rem;
    background: linear-gradient(90deg, var(--primary), #818cf8);
    transition: width 0.3s ease;
    border-radius: 0.5rem;
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-light);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Error/Success Messages - Clean & Modern */
.message-container {
    margin: 1.5rem 0;
}

.message {
    padding: 1rem 1.25rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    box-shadow: var(--shadow-sm);
    position: relative;
}

.message-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.message-content {
    flex: 1;
}

.message-content strong {
    display: block;
    margin-bottom: 0.25rem;
}

.message-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: inherit;
    opacity: 0.6;
    padding: 0;
    line-height: 1;
}

.message-close:hover {
    opacity: 1;
}

.message-error {
    background: var(--error-light);
    border: 1px solid var(--error);
    color: #991b1b;
}

.message-success {
    background: var(--success-light);
    border: 1px solid var(--success);
    color: #065f46;
}

.message-warning {
    background: var(--warning-light);
    border: 1px solid var(--warning);
    color: #92400e;
}

.message-info {
    background: var(--primary-light);
    border: 1px solid var(--primary);
    color: #3730a3;
}

/* Table Styles - Clean & Modern */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

th,
td {
    padding: 0.875rem;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

tbody tr:hover {
    background: var(--bg-secondary);
}

tbody tr:last-child td {
    border-bottom: none;
}

/* Input Styles - Clean & Modern */
input[type="text"],
input[type="number"],
input[type="email"],
textarea,
select {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-main);
    border: 1px solid var(--border-medium);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.2s;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-light);
}

.pagination span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Progress Indicator Overlay */
.progress-indicator {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-card);
    padding: 2rem 3rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    text-align: center;
}

.progress-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.progress-content p {
    color: var(--text-secondary);
    margin: 0;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 0 2rem;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--text-primary);
    line-height: 1.2;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.content-section h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.content-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
    color: var(--primary);
}

.content-section p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.content-section ul {
    color: var(--text-secondary);
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.content-section li {
    margin-bottom: 0.5rem;
    line-height: 1.7;
}

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

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

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

.mt-1 {
    margin-top: 0.5rem;
}

.mt-2 {
    margin-top: 1rem;
}

.mt-3 {
    margin-top: 1.5rem;
}

.mt-4 {
    margin-top: 2rem;
}

.mb-1 {
    margin-bottom: 0.5rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

.mb-3 {
    margin-bottom: 1.5rem;
}

.mb-4 {
    margin-bottom: 2rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.3s ease-out;
}

.fade-out {
    animation: fadeOut 0.3s ease-out forwards;
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
    }
}

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

    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .upload-area {
        padding: 2rem 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    table {
        font-size: 0.875rem;
    }

    th,
    td {
        padding: 0.5rem;
    }
}

/* Footer - Clean & Simple */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
    color: var(--text-secondary);
}

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

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

footer p {
    margin: 0;
    font-size: 0.9rem;
}

/* Tool-Specific Styles */

/* Column Extractor */
.columns-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.column-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-medium);
    border-radius: 0.5rem;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    font-weight: 500;
}

.column-card:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.column-card.selected {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--primary);
}

.format-selector {
    display: flex;
    gap: 1rem;
    margin: 1rem 0;
}

.format-selector label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.format-selector input[type="radio"] {
    width: auto;
}

/* CSV Splitter */
.input-group {
    margin: 1.5rem 0;
}

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

.input-group input {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-main);
    border: 1px solid var(--border-medium);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-size: 1rem;
}

.info-box {
    background: var(--primary-light);
    border: 1px solid var(--primary);
    border-radius: 0.5rem;
    padding: 1rem;
    margin: 1rem 0;
}

.info-box p {
    margin: 0;
    color: var(--text-primary);
}

/* Data Converter */
.converter-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.option-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-medium);
    border-radius: 0.5rem;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.option-card:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.option-card.selected {
    border-color: var(--primary);
    background: var(--primary-light);
}

.preview-area {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: 0.5rem;
    padding: 1rem;
    margin: 1rem 0;
    max-height: 400px;
    overflow: auto;
}

.preview-area pre {
    margin: 0;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-wrap: break-word;
}