/* ═══════════════════════════════════════════════════════════
   StackSpy — Website Technology Detector — Stylesheet
   ═══════════════════════════════════════════════════════════ */

:root {
    --bg:            #0f1117;
    --bg-card:       #1a1d27;
    --bg-card-hover: #22263a;
    --bg-input:      #141620;
    --border:        #2a2e3e;
    --border-hover:  #3a3f55;
    --text:          #e4e6ed;
    --text-muted:    #8b8fa3;
    --text-dim:      #5a5e72;
    --accent:        #6366f1;
    --accent-hover:  #818cf8;
    --accent-glow:   rgba(99, 102, 241, 0.25);
    --green:         #22c55e;
    --green-bg:      rgba(34, 197, 94, 0.1);
    --green-border:  rgba(34, 197, 94, 0.3);
    --yellow:        #eab308;
    --yellow-bg:     rgba(234, 179, 8, 0.1);
    --yellow-border: rgba(234, 179, 8, 0.3);
    --red:           #ef4444;
    --red-bg:        rgba(239, 68, 68, 0.1);
    --red-border:    rgba(239, 68, 68, 0.3);
    --blue:          #3b82f6;
    --blue-bg:       rgba(59, 130, 246, 0.1);
    --blue-border:   rgba(59, 130, 246, 0.3);
    --cyan:          #06b6d4;
    --cyan-bg:       rgba(6, 182, 212, 0.1);
    --orange:        #f97316;
    --orange-bg:     rgba(249, 115, 22, 0.1);
    --purple:        #a855f7;
    --purple-bg:     rgba(168, 85, 247, 0.1);
    --gray:          #6b7280;
    --gray-bg:       rgba(107, 114, 128, 0.1);
    --radius:        12px;
    --radius-sm:     8px;
    --radius-xs:     6px;
    --shadow:        0 4px 24px rgba(0,0,0,0.3);
    --transition:    0.2s ease;
}

/* ── Reset & Base ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

/* ── Layout ────────────────────────────────────────────── */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* ── Header ────────────────────────────────────────────── */
header {
    text-align: center;
    padding: 3rem 0 2rem;
}
.brand-logo {
    display: block;
    max-width: 250px;
    height: auto;
    margin: 0 auto 1.2rem;
}
header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.3rem;
}
header p {
    color: var(--text-muted);
    font-size: 0.92rem;
    max-width: 600px;
    margin: 0 auto;
}
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    margin-top: 0.8rem;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-dim);
    transition: color 0.2s ease;
}
.back-link:hover { color: var(--accent); text-decoration: none; }

/* ── Cards ─────────────────────────────────────────────── */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

/* ── Search ────────────────────────────────────────────── */
.search-section { margin-bottom: 1.5rem; }

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.input-wrapper {
    position: relative;
    display: flex;
    gap: 0.5rem;
}

input[type="text"] {
    width: 100%;
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: var(--transition);
}

input[type="text"]:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

input[type="text"]::placeholder { color: var(--text-dim); }

/* ── Buttons ───────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.75rem 1.5rem;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}
.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
    box-shadow: 0 0 16px var(--accent-glow);
}
.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    box-shadow: none;
}

.btn-sm { padding: 0.4rem 0.8rem; font-size: 0.78rem; border-radius: var(--radius-xs); }

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 0.4rem 0.8rem;
}
.btn-ghost:hover { color: var(--text); border-color: var(--border-hover); background: var(--bg-card-hover); }

/* ── Recent Searches ──────────────────────────────────── */
.recent-searches {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.8rem;
    flex-wrap: wrap;
}
.recent-label { font-size: 0.72rem; color: var(--text-dim); font-weight: 500; }
.recent-tags { display: flex; gap: 0.3rem; flex-wrap: wrap; }
.recent-tag {
    font-size: 0.7rem;
    font-family: 'JetBrains Mono', monospace;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
}
.recent-tag:hover { border-color: var(--accent); color: var(--accent); }

/* ── Loading ───────────────────────────────────────────── */
.loading-state { margin-bottom: 1.5rem; }
.loading-card { text-align: center; }
.loading-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.2rem;
    color: var(--accent);
}
.loading-steps {
    display: flex;
    justify-content: center;
    gap: 1.2rem;
    flex-wrap: wrap;
}
.loading-step {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    color: var(--text-dim);
    transition: color 0.3s ease;
}
.loading-step.active { color: var(--accent); }
.loading-step.done { color: var(--green); }
.step-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--border);
    transition: background 0.3s ease;
}
.loading-step.active .step-dot { background: var(--accent); animation: pulse 1s ease infinite; }
.loading-step.done .step-dot { background: var(--green); }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}
.spin { animation: spin 1s linear infinite; }

/* ── Error ─────────────────────────────────────────────── */
.error-state { margin-bottom: 1.5rem; }
.card-error {
    border-color: var(--red-border);
    background: var(--red-bg);
    display: flex;
    align-items: center;
    gap: 0.8rem;
}
.error-icon { color: var(--red); flex-shrink: 0; }
.card-error p { color: var(--red); font-size: 0.9rem; }

/* ── Summary Bar ───────────────────────────────────────── */
.summary-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: center;
    margin-bottom: 1.5rem;
    padding: 1.2rem 1.5rem;
}
.summary-item {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}
.summary-value {
    font-size: 1.3rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
}
.summary-label {
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.summary-url {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    color: var(--accent);
    margin-left: auto;
    word-break: break-all;
}

/* ── Tech Grid (quick overview chips) ──────────────────── */
.tech-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1.5rem;
}
.tech-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.3rem 0.65rem;
    border-radius: 6px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text);
    transition: var(--transition);
}
.tech-chip:hover {
    border-color: var(--accent);
    background: var(--bg-card-hover);
}
.tech-chip .chip-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}
.tech-chip .chip-version {
    color: var(--text-dim);
    font-weight: 400;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.68rem;
}

/* Category-specific chip dot colors */
.chip-dot.cat-cms           { background: var(--blue); }
.chip-dot.cat-server        { background: var(--orange); }
.chip-dot.cat-framework     { background: var(--purple); }
.chip-dot.cat-js            { background: var(--yellow); }
.chip-dot.cat-css           { background: var(--cyan); }
.chip-dot.cat-analytics     { background: var(--green); }
.chip-dot.cat-cdn           { background: var(--orange); }
.chip-dot.cat-font          { background: var(--text-muted); }
.chip-dot.cat-ecommerce     { background: var(--green); }
.chip-dot.cat-security      { background: var(--red); }
.chip-dot.cat-seo           { background: var(--blue); }
.chip-dot.cat-media         { background: var(--purple); }
.chip-dot.cat-performance   { background: var(--cyan); }
.chip-dot.cat-other         { background: var(--gray); }

/* ── Category Sections ─────────────────────────────────── */
.category-section {
    margin-bottom: 1rem;
}
.category-section .card {
    padding: 1.2rem 1.5rem;
}
.category-header {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.8rem;
    cursor: pointer;
}
.category-header h3 {
    font-size: 0.95rem;
    font-weight: 700;
}
.category-count {
    font-size: 0.68rem;
    font-weight: 600;
    padding: 0.1rem 0.45rem;
    border-radius: 4px;
    background: var(--accent-glow);
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
}
.category-icon {
    width: 28px; height: 28px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* Category icon colors */
.category-icon.ci-cms        { background: var(--blue-bg); color: var(--blue); }
.category-icon.ci-server     { background: var(--orange-bg); color: var(--orange); }
.category-icon.ci-framework  { background: var(--purple-bg); color: var(--purple); }
.category-icon.ci-js         { background: var(--yellow-bg); color: var(--yellow); }
.category-icon.ci-css        { background: var(--cyan-bg); color: var(--cyan); }
.category-icon.ci-analytics  { background: var(--green-bg); color: var(--green); }
.category-icon.ci-cdn        { background: var(--orange-bg); color: var(--orange); }
.category-icon.ci-font       { background: var(--gray-bg); color: var(--gray); }
.category-icon.ci-ecommerce  { background: var(--green-bg); color: var(--green); }
.category-icon.ci-security   { background: var(--red-bg); color: var(--red); }
.category-icon.ci-seo        { background: var(--blue-bg); color: var(--blue); }
.category-icon.ci-media      { background: var(--purple-bg); color: var(--purple); }
.category-icon.ci-performance{ background: var(--cyan-bg); color: var(--cyan); }
.category-icon.ci-other      { background: var(--gray-bg); color: var(--gray); }

.tech-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.tech-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.6rem 0.8rem;
    border-radius: var(--radius-xs);
    background: var(--bg-input);
    border: 1px solid transparent;
    transition: var(--transition);
}
.tech-item:hover {
    border-color: var(--border);
    background: var(--bg-card-hover);
}
.tech-name {
    font-weight: 600;
    font-size: 0.88rem;
}
.tech-version {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--accent);
    background: var(--accent-glow);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
}
.tech-confidence {
    margin-left: auto;
    font-size: 0.7rem;
    color: var(--text-dim);
    font-family: 'JetBrains Mono', monospace;
}
.confidence-bar {
    width: 40px;
    height: 4px;
    border-radius: 2px;
    background: var(--border);
    overflow: hidden;
    margin-left: 0.3rem;
    display: inline-block;
    vertical-align: middle;
}
.confidence-fill {
    height: 100%;
    border-radius: 2px;
    transition: width 0.4s ease;
}
.conf-high   { background: var(--green); }
.conf-medium { background: var(--yellow); }
.conf-low    { background: var(--orange); }

/* ── Result Actions ────────────────────────────────────── */
.result-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 1.5rem;
    margin-bottom: 1.5rem;
}

/* ── Footer ────────────────────────────────────────────── */
footer {
    text-align: center;
    padding: 1.5rem 0;
    color: var(--text-dim);
    font-size: 0.75rem;
    border-top: 1px solid var(--border);
}
.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.3rem;
}
.footer-icon { width: 20px; height: 20px; border-radius: 4px; }
.footer-sub { font-size: 0.7rem; color: var(--text-dim); margin-top: 0.2rem; }

/* ── Responsive ────────────────────────────────────────── */
@media (max-width: 600px) {
    .container { padding: 1rem; }
    header h1 { font-size: 1.6rem; }
    .summary-bar { flex-direction: column; align-items: flex-start; gap: 0.8rem; }
    .summary-url { margin-left: 0; }
    .loading-steps { flex-direction: column; align-items: center; }
}