/* SpecDrift - Dark Theme inspired by alt.css */

:root {
    --color-breaking: #ef4444;
    --color-potentially: #f59e0b;
    --color-non-breaking: #10b981;
    --color-primary: #38bdf8;
    --color-secondary: #94a3b8;
    --color-background: #0f172a;
    --color-surface: #1e293b;
    --color-border: #334155;
    --color-text: #e5e7eb;
    --color-text-muted: #64748b;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --radius: 6px;
}

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

html,
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1a1f3a 100%);
  color: #e5e7eb;
  line-height: 1.6;
  min-height: 100vh;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 1.2rem;
  color: var(--color-secondary);
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.hero {
  text-align: center;
  margin-bottom: 4rem;
  animation: fadeIn 0.8s ease-out;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #38bdf8 0%, #0ea5e9 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.layout {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.side-panel {
    flex: 0 0 260px;
    position: sticky;
    top: var(--spacing-lg);
}

.side-panel .ad-slot {
    margin-bottom: 0;
}

.features {
  background: rgba(30, 41, 59, 0.5);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: 12px;
  padding: 3rem 2rem;
  margin: 3rem 0;
  backdrop-filter: blur(10px);
}

.features h2 {
  font-size: 1.8rem;
  margin-bottom: 2rem;
  text-align: center;
}

.feature-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.feature-list li {
  padding: 1.5rem;
  background: rgba(15, 23, 42, 0.6);
  border-radius: 8px;
  border-left: 4px solid #38bdf8;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.feature-list li:hover {
  background: rgba(15, 23, 42, 0.9);
  transform: translateX(4px);
}

.feature-list .icon {
  font-size: 1.5rem;
  min-width: 2rem;
}

/* Header */
header {
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(10px);
  padding: 2rem 1rem;
  text-align: center;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

header h1 {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
  letter-spacing: -0.5px;
}

header .tagline {
  color: #94a3b8;
  font-size: 0.95rem;
  font-weight: 500;
}

/* Main content */
main {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

/* Forms */
.form-container {
    margin-bottom: var(--spacing-lg);
}

fieldset {
    border: none;
    padding: 0;
}

legend {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    padding: 0;
    color: var(--color-text);
}

footer {
  margin-top: 4rem;
  padding-top: 2rem;
  text-align: center;
  font-size: 0.9rem;
  color: #64748b;
  border-top: 1px solid rgba(148, 163, 184, 0.1);
}

.cta {
  display: inline-block;
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, #38bdf8 0%, #0ea5e9 100%);
  color: #020617;
  text-decoration: none;
  font-weight: 600;
  border-radius: 8px;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  box-shadow: 0 10px 30px rgba(56, 189, 248, 0.2);
  margin: 2rem 0;
  cursor: pointer;
  border: none;
}

.cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 40px rgba(56, 189, 248, 0.3);
}

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

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

/* Tab switching */
.input-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.tab-button {
    background: none;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    color: var(--color-secondary);
    font-size: 0.95rem;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.tab-button:hover {
    color: var(--color-primary);
}

.tab-button.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    font-weight: 600;
}

/* File inputs */
.file-input {
    display: block;
    width: 100%;
    padding: var(--spacing-md);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    background-color: var(--color-background);
    color: var(--color-text);
    transition: all 0.2s ease;
}

.file-input:hover {
    border-color: var(--color-primary);
    background-color: rgba(56, 189, 248, 0.1);
}

.file-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* Textarea */
.spec-textarea {
    width: 100%;
    min-height: 250px;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    resize: vertical;
    line-height: 1.5;
    background: var(--color-background);
    color: var(--color-text);
}

.spec-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

/* Buttons */
.btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 700;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: var(--color-primary);
    color: #020617;
}

.btn-primary:hover {
    background: #0ea5e9;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(56, 189, 248, 0.4);
}

.btn-secondary {
    background-color: var(--color-border);
    color: var(--color-text);
}

.btn-secondary:hover {
    background-color: #475569;
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
    align-items: center;
}

/* Results */
.results-container {
    margin-top: var(--spacing-lg);
}

/* Ads (non-intrusive) */
/* .ad-slot {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius);
    background: rgba(56, 189, 248, 0.05);
    color: var(--color-text);
} */

/* Fixed side banners */
/* .ad-banner {
    position: fixed;
    top: 140px;
    width: 160px;
    padding: var(--spacing-md);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    display: none;
    z-index: 50;
    color: var(--color-text);
}

.ad-banner .ad-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 700;
    color: var(--color-secondary);
}

.ad-banner .ad-text {
    font-weight: 500;
    font-size: 0.85rem;
}

.ad-banner .ad-link {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: none;
}

.ad-banner .ad-link:hover {
    text-decoration: underline;
}

.ad-banner.ad-left {
    left: 24px;
}

.ad-banner.ad-right {
    right: 24px;
}

@media (min-width: 1300px) {
    .ad-banner {
        display: flex;
        flex-direction: column;
        gap: 6px;
    }
} */

/* .ad-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
    color: var(--color-secondary);
}

.ad-text {
    font-weight: 500;
}

.ad-link {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: none;
}

.ad-link:hover {
    text-decoration: underline;
} */

/* Summary */
.summary {
    margin-bottom: var(--spacing-xl);
}

.summary h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.summary-item {
    padding: var(--spacing-lg);
    border-radius: var(--radius);
    text-align: center;
    color: white;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    transition: all 0.2s ease;
}

.summary-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.summary-item.active {
    box-shadow: 0 0 0 3px var(--color-primary);
    transform: scale(1.05);
}

.summary-item.breaking {
    background-color: var(--color-breaking);
}

.summary-item.potentially-breaking {
    background-color: var(--color-potentially);
    color: #020617;
}

.summary-item.non-breaking {
    background-color: var(--color-non-breaking);
}

.summary-item .count {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.summary-item .label {
    display: block;
    font-size: 0.95rem;
    opacity: 0.95;
    font-weight: 500;
}

/* Changes list */
.changes-list {
    margin-top: var(--spacing-lg);
}

.change-group {
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid;
    padding-left: var(--spacing-lg);
}

.change-group.breaking {
    border-left-color: var(--color-breaking);
}

.change-group.potentially-breaking {
    border-left-color: var(--color-potentially);
}

.change-group.non-breaking {
    border-left-color: var(--color-non-breaking);
}

.change-group h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    font-weight: 600;
}

.change-group ul {
    list-style: none;
}

.change-group li {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background-color: var(--color-background);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

.change-detail {
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    word-break: break-word;
    color: var(--color-text);
}

.change-detail code {
    background-color: var(--color-surface);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--color-primary);
    border: 1px solid var(--color-border);
}

.change-message {
    color: var(--color-secondary);
    font-size: 0.9rem;
}

.no-changes {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-non-breaking);
    font-size: 1.1rem;
    font-weight: 500;
}

/* Loading */
.loading {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-secondary);
}

/* Errors */
.error {
    padding: var(--spacing-lg);
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--color-breaking);
    color: #fca5a5;
    border-radius: var(--radius);
    margin-bottom: var(--spacing-lg);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        margin: 2rem auto;
        padding: var(--spacing-lg);
    }

    .layout {
        flex-direction: column;
    }

    .side-panel {
        position: static;
        width: 100%;
    }

    header h1 {
        font-size: 2rem;
    }

    main {
        padding: var(--spacing-lg);
    }

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

    .form-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}