/* ═══════════════════════════════════════════════════════════════
   Sibilla — L'Oracolo AI
   Mobile-first responsive stylesheet
   ═══════════════════════════════════════════════════════════════ */

:root {
    --bg: #0f0f14;
    --surface: #1a1a24;
    --surface-hover: #22222e;
    --border: #2a2a3a;
    --text: #e8e8ed;
    --text-muted: #8888a0;
    --accent: #a78bfa;
    --accent-glow: #c4b5fd;
    --success: #34d399;
    --danger: #f87171;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    justify-content: center;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Subtle background ambience */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 50% 0%, rgba(167, 139, 250, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 100%, rgba(139, 92, 246, 0.04) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    position: relative;
    z-index: 1;
    max-width: 800px;
    width: 100%;
    padding: 1rem 1rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
}

/* ── Header ──────────────────────────────────────────────────── */

header {
    text-align: center;
    margin-bottom: 1.5rem;
    padding-top: 1.5rem;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), var(--accent-glow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.35rem;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
}

.logo {
    width: 1.8rem;
    height: 1.8rem;
    filter: drop-shadow(0 0 10px rgba(167, 139, 250, 0.45));
    flex-shrink: 0;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 0 0.5rem;
}

/* ── Search Box ──────────────────────────────────────────────── */

.search-box {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-bottom: 1.5rem;
}

.search-box textarea {
    width: 100%;
    padding: 0.85rem 1rem;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    min-height: 70px;
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
    -webkit-appearance: none;
}

.search-box textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.15);
}

.search-box textarea::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

#submit-btn {
    width: 100%;
    padding: 0.85rem 1.5rem;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    border: none;
    border-radius: var(--radius);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
    -webkit-tap-highlight-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    min-height: 48px;
}

#submit-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(167, 139, 250, 0.35);
}

#submit-btn:active {
    transform: scale(0.98);
}

#submit-btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* ── Response Area ───────────────────────────────────────────── */

.response-area {
    flex: 1;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Loading ─────────────────────────────────────────────────── */

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.85rem;
    padding: 2rem 1rem;
    color: var(--text-muted);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading p {
    font-size: 0.9rem;
}

/* ── New Search ──────────────────────────────────────────────── */

.new-search-btn {
    display: none;
    width: 100%;
    padding: 0.65rem 1rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    margin-bottom: 1rem;
    transition: border-color var(--transition), color var(--transition);
    min-height: 44px;
}

.new-search-btn:hover {
    border-color: var(--accent);
    color: var(--accent-glow);
}

.new-search-btn.visible {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
}

/* ── Answer ──────────────────────────────────────────────────── */

.answer {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.15rem;
    margin-bottom: 1rem;
    line-height: 1.7;
    font-size: 0.95rem;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.answer:empty {
    display: none;
}

.answer h1, .answer h2, .answer h3 {
    margin-top: 1.1rem;
    margin-bottom: 0.4rem;
    color: var(--accent-glow);
    line-height: 1.3;
}

.answer h1 { font-size: 1.35rem; }
.answer h2 { font-size: 1.15rem; }
.answer h3 { font-size: 1.05rem; }

.answer p {
    margin-bottom: 0.65rem;
}

.answer ul, .answer ol {
    padding-left: 1.25rem;
    margin-bottom: 0.65rem;
}

.answer li {
    margin-bottom: 0.3rem;
}

.answer a {
    color: var(--accent-glow);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.answer a:hover {
    color: var(--accent);
}

.answer code {
    background: rgba(167, 139, 250, 0.1);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.88em;
    word-break: break-word;
}

.answer pre {
    background: rgba(0, 0, 0, 0.35);
    padding: 0.85rem;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin-bottom: 0.65rem;
    font-size: 0.85em;
    -webkit-overflow-scrolling: touch;
}

.answer pre code {
    background: none;
    padding: 0;
    border-radius: 0;
}

.answer blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.65rem;
    font-style: italic;
}

/* ── Metadata bar ────────────────────────────────────────────── */

.meta-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    align-items: center;
}

.meta-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.2rem 0.5rem;
    background: rgba(167, 139, 250, 0.08);
    border-radius: 100px;
    font-size: 0.72rem;
}

.meta-badge.engine {
    background: rgba(52, 211, 153, 0.1);
    color: var(--success);
}

/* ── Sources ─────────────────────────────────────────────────── */

.sources {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    margin-bottom: 1rem;
}

.sources:empty {
    display: none;
}

.sources h3 {
    color: var(--accent-glow);
    font-size: 0.82rem;
    margin-bottom: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.source-item {
    display: block;
    padding: 0.55rem 0.65rem;
    border-radius: var(--radius-sm);
    color: var(--text);
    text-decoration: none;
    transition: background var(--transition);
    margin-bottom: 0.15rem;
    font-size: 0.85rem;
    -webkit-tap-highlight-color: transparent;
}

.source-item:active,
.source-item:hover {
    background: var(--surface-hover);
}

.source-item .source-index {
    display: inline-block;
    width: 1.3rem;
    height: 1.3rem;
    line-height: 1.3rem;
    text-align: center;
    background: rgba(167, 139, 250, 0.15);
    color: var(--accent-glow);
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    margin-right: 0.4rem;
    flex-shrink: 0;
}

.source-item .source-title {
    font-weight: 500;
    color: var(--accent-glow);
}

.source-item .source-url {
    color: var(--text-muted);
    font-size: 0.75rem;
    display: block;
    margin-top: 0.1rem;
    word-break: break-all;
}

/* ── Error ───────────────────────────────────────────────────── */

.error-box {
    background: rgba(248, 113, 113, 0.08);
    border: 1px solid var(--danger);
    border-radius: var(--radius);
    padding: 0.85rem 1rem;
    color: var(--danger);
    font-size: 0.9rem;
}

/* ── Footer ──────────────────────────────────────────────────── */

footer {
    text-align: center;
    padding: 1.25rem 0 0.75rem;
    color: var(--text-muted);
    font-size: 0.72rem;
    margin-top: auto;
}

/* ═══════════════════════════════════════════════════════════════
   Tablet / Desktop ≥ 640px
   ═══════════════════════════════════════════════════════════════ */

@media (min-width: 640px) {
    .container {
        padding: 2rem 2rem;
    }

    header {
        margin-bottom: 2.5rem;
        padding-top: 2.5rem;
    }

    header h1 {
        font-size: 2.4rem;
        gap: 0.5rem;
    }

    .logo {
        width: 2.4rem;
        height: 2.4rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .search-box {
        gap: 0.75rem;
        margin-bottom: 2rem;
    }

    .search-box textarea {
        padding: 1rem 1.25rem;
        font-size: 1.05rem;
        min-height: 80px;
    }

    #submit-btn {
        width: auto;
        align-self: flex-end;
        padding: 0.75rem 2rem;
    }

    .answer {
        padding: 1.5rem;
        font-size: 1rem;
    }

    .answer h1 { font-size: 1.5rem; }
    .answer h2 { font-size: 1.25rem; }
    .answer h3 { font-size: 1.1rem; }

    .sources {
        padding: 1.25rem;
    }

    .source-item {
        font-size: 0.9rem;
    }
}

/* ═══════════════════════════════════════════════════════════════
   Desktop ≥ 900px
   ═══════════════════════════════════════════════════════════════ */

@media (min-width: 900px) {
    header {
        padding-top: 3.5rem;
        margin-bottom: 3rem;
    }

    header h1 {
        font-size: 2.8rem;
    }

    .logo {
        width: 2.8rem;
        height: 2.8rem;
    }

    .answer {
        padding: 1.75rem;
    }
}

/* ═══════════════════════════════════════════════════════════════
   Reduce motion for accessibility
   ═══════════════════════════════════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .response-area {
        animation: none;
    }

    .spinner {
        animation-duration: 1.5s;
    }

    * {
        transition-duration: 0.01ms !important;
    }
}