/* UTM Builder Specific Styles */
:root {
    --color-primary: #4F46E5;
    --color-primary-dark: #4338CA;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;
    --color-text: #1F2937;
    --color-text-light: #6B7280;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F9FAFB;
    --color-border: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 0.5rem;
}

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

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

/* Header Styles */
.header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

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

.nav__logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
    transition: opacity 0.2s;
}

.nav__logo:hover {
    opacity: 0.8;
}

.nav__link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav__link:hover {
    color: var(--color-primary-dark);
}

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

/* Main */
.main {
    flex: 1;
    padding-bottom: 4rem;
}

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

.hero__title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-text);
    margin: 0 0 1rem;
    line-height: 1.2;
}

.hero__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 42rem;
    margin: 0 auto;
    line-height: 1.6;
}

/* Builder Section */
.builder-section {
    margin: 2rem 0;
}

.builder-card {
    background: var(--color-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    max-width: 48rem;
    margin: 0 auto;
}

/* Form Styles */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group:last-of-type {
    margin-bottom: 2rem;
}

.form-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.required {
    color: var(--color-error);
    font-weight: 700;
}

.optional {
    color: var(--color-text-light);
    font-weight: 400;
    font-size: 0.813rem;
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    transition: all 0.2s;
    font-family: inherit;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-input::placeholder {
    color: #9CA3AF;
}

.form-help {
    margin-top: 0.375rem;
    font-size: 0.813rem;
    color: var(--color-text-light);
    line-height: 1.4;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    font-family: inherit;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn--primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    box-shadow: var(--shadow-md);
}

.btn--secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.btn--secondary:hover:not(:disabled) {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn--icon {
    padding: 0.5rem 1rem;
}

/* Results Section */
.results-section {
    margin: 2rem 0;
    max-width: 56rem;
    margin-left: auto;
    margin-right: auto;
}

.result-card {
    background: var(--color-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.result-card__title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 1.5rem;
}

.result-card__title svg {
    color: var(--color-primary);
}

/* URL Display */
.url-display {
    display: flex;
    gap: 1rem;
    align-items: stretch;
}

.url-box {
    flex: 1;
    padding: 1rem;
    background: var(--color-bg-alt);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    overflow-x: auto;
}

.url-box code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.875rem;
    color: var(--color-text);
    word-break: break-all;
    line-height: 1.6;
}

/* UTM Breakdown */
.utm-breakdown {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.breakdown-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.75rem;
    background: var(--color-bg-alt);
    border-radius: 0.375rem;
    border-left: 3px solid var(--color-primary);
}

.breakdown-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-family: 'Courier New', monospace;
}

.breakdown-value {
    font-size: 0.938rem;
    color: var(--color-text);
    word-break: break-word;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

/* Info Section */
.info-section {
    margin: 3rem 0;
    max-width: 56rem;
    margin-left: auto;
    margin-right: auto;
}

.info-card {
    background: var(--color-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: 2rem;
}

.info-card__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 1rem;
}

.info-subtitle {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin: 1.5rem 0 0.75rem;
}

.info-text {
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.info-list {
    list-style: none;
    padding: 0;
}

.info-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--color-text-light);
    line-height: 1.6;
}

.info-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.info-list strong {
    color: var(--color-text);
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
}

/* Footer */
.footer {
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: 2rem 0;
    margin-top: auto;
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero__title {
        font-size: 2rem;
    }

    .hero__subtitle {
        font-size: 1rem;
    }

    .builder-card,
    .result-card,
    .info-card {
        padding: 1.5rem;
    }

    .url-display {
        flex-direction: column;
    }

    .btn--icon {
        width: 100%;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero {
        padding: 2rem 0 1.5rem;
    }

    .hero__title {
        font-size: 1.75rem;
    }

    .builder-card,
    .result-card,
    .info-card {
        padding: 1.25rem;
    }
}