:root {
    --primary: #FF4500;
    --primary-dark: #CC3700;
    --glass-bg: rgba(22, 18, 20, 0.72);
    --glass-border: rgba(255, 255, 255, 0.10);
    --text: #F5F1EE;
    --text-muted: rgba(245, 241, 238, 0.62);
    --bubble-bot: rgba(255, 255, 255, 0.08);
    --input-bg: rgba(255, 255, 255, 0.06);
    --radius: 20px;
    --radius-sm: 14px;
    --shadow-panel: 0 24px 60px rgba(0, 0, 0, 0.45), 0 4px 16px rgba(0, 0, 0, 0.25);
    --shadow-btn: 0 8px 24px rgba(255, 69, 0, 0.35);
    --anim-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    margin: 0;
    background: transparent !important;
    overscroll-behavior: contain;
}

#chatbot-root {
    position: fixed;
    inset: 0;
    pointer-events: none;
    font-family: 'Inter', sans-serif;
}

/* ---------- Floating toggle button ---------- */

.chat-toggle-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    height: 54px;
    padding: 0 26px;
    border-radius: 999px;
    border: none;
    outline: none;
    appearance: none;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    touch-action: manipulation;
    box-shadow: var(--shadow-btn);
    pointer-events: auto;
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.15s ease;
    animation: pulse 3.5s ease-in-out infinite;
    z-index: 1000;
}

.chat-toggle-btn:hover {
    transform: scale(1.04) translateY(-2px);
    box-shadow: 0 12px 32px rgba(255, 69, 0, 0.45);
}

.chat-toggle-btn:active { transform: scale(0.96); }

.toggle-label {
    font-family: 'Sora', sans-serif;
    font-size: 14.5px;
    font-weight: 600;
    line-height: 1;
}

.chat-toggle-btn.open { opacity: 0; pointer-events: none; }

@keyframes pulse {
    0%, 100% { box-shadow: var(--shadow-btn); }
    50% { box-shadow: 0 8px 24px rgba(255, 69, 0, 0.35), 0 0 0 10px rgba(255, 69, 0, 0.12); }
}

/* ---------- Panel ---------- */

.chat-panel {
    position: fixed;
    bottom: 0;
    right: 0;
    width: 440px;
    height: 720px;
    max-width: 100%;
    max-height: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(24px) saturate(160%);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    border-radius: var(--radius);
    box-shadow: var(--shadow-panel);
    border: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    overscroll-behavior: contain;
    pointer-events: none;
    opacity: 0;
    transform: scale(0.95) translateY(16px);
    transform-origin: bottom right;
    transition: opacity 0.3s var(--anim-ease), transform 0.3s var(--anim-ease);
    z-index: 999;
}

.chat-panel.open {
    pointer-events: auto;
    opacity: 1;
    transform: scale(1) translateY(0);
}

.chat-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.25);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 998;
    display: none;
}

/* ---------- Header ---------- */

.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 20px;
    background: linear-gradient(135deg, rgba(255, 69, 0, 0.14), rgba(255, 255, 255, 0.02));
    border-bottom: 1px solid var(--glass-border);
    flex-shrink: 0;
}

.header-left { display: flex; align-items: center; gap: 12px; }

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Sora', sans-serif;
    font-weight: 600;
    font-size: 13px;
    flex-shrink: 0;
}

.header-title {
    font-family: 'Sora', sans-serif;
    font-size: 14.5px;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 6px;
}

.online-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 69, 0, 0.20);
}

.header-sub { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

.icon-btn {
    -webkit-appearance: none;
    appearance: none;
    width: 30px;
    height: 30px;
    padding: 0;
    margin: 0;
    border-radius: 50%;
    border: none;
    outline: none;
    background: transparent;
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    touch-action: manipulation;
    flex-shrink: 0;
    line-height: 0;
    font-size: 0;
    transition: background 0.18s ease, color 0.18s ease;
}

.icon-btn svg { display: block; pointer-events: none; }

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text);
}

/* ---------- Body ---------- */

.chat-body {
    flex: 1;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chat-body::-webkit-scrollbar { width: 6px; }
.chat-body::-webkit-scrollbar-thumb { background: var(--glass-border); border-radius: 4px; }
.chat-body { scrollbar-width: thin; scrollbar-color: var(--glass-border) transparent; }

.greeting-block { padding: 8px 2px 4px; }

.greeting {
    font-family: 'Sora', sans-serif;
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 4px;
    color: var(--text);
}

.greeting-sub { margin: 0 0 18px; font-size: 13.5px; color: var(--text-muted); }

.suggestion-cards { display: flex; flex-direction: column; gap: 10px; }

.suggestion-card {
    text-align: left;
    padding: 13px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.04);
    cursor: pointer;
    touch-action: manipulation;
    display: flex;
    flex-direction: column;
    gap: 2px;
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.suggestion-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.07);
}

.suggestion-card:active { transform: translateY(0) scale(0.98); }

.card-title { font-size: 13.5px; font-weight: 600; color: var(--text); }
.card-desc { font-size: 12px; color: var(--text-muted); }

/* ---------- Messages ---------- */

.message-row {
    display: flex;
    flex-direction: column;
    max-width: 82%;
    animation: rise 0.28s ease forwards;
    opacity: 0;
    transform: translateY(6px);
}

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

.message-row.user { align-self: flex-end; align-items: flex-end; }
.message-row.bot { align-self: flex-start; align-items: flex-start; }

.bubble {
    padding: 11px 14px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    line-height: 1.5;
    word-wrap: break-word;
}

.message-row.user .bubble {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border-bottom-right-radius: 4px;
}

.message-row.bot .bubble {
    background: var(--bubble-bot);
    color: var(--text);
    border: 1px solid var(--glass-border);
    border-bottom-left-radius: 4px;
}

.message-row.error .bubble {
    background: rgba(180, 35, 44, 0.20);
    color: #FF8A80;
    border: 1px solid rgba(180, 35, 44, 0.35);
}

.bubble strong { font-weight: 600; }
.bubble .md-heading { display: block; font-size: 14.5px; margin: 4px 0; }
.bubble a { color: #FFB199; text-decoration: underline; }

.timestamp { font-size: 10.5px; color: var(--text-muted); margin-top: 4px; padding: 0 2px; }

.typing-bubble { display: flex; align-items: center; gap: 4px; padding: 13px 14px; }

.typing-bubble span {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--text-muted); opacity: 0.6;
    animation: bounce 1.2s infinite;
}
.typing-bubble span:nth-child(2) { animation-delay: 0.15s; }
.typing-bubble span:nth-child(3) { animation-delay: 0.3s; }

@keyframes bounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-4px); opacity: 1; }
}

/* ---------- Input row ---------- */

.chat-input {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    padding: 14px 16px;
    border-top: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.03);
    flex-shrink: 0;
}

.chat-input textarea {
    flex: 1;
    min-width: 0;
    resize: none;
    max-height: 100px;
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 10px 16px;
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    color: var(--text);
    background: var(--input-bg);
    outline: none;
    overflow-y: auto;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.chat-input textarea::-webkit-scrollbar { width: 5px; }
.chat-input textarea::-webkit-scrollbar-thumb { background: var(--glass-border); border-radius: 4px; }
.chat-input textarea::-webkit-scrollbar-track { background: transparent; }
.chat-input textarea { scrollbar-width: thin; scrollbar-color: var(--glass-border) transparent; }

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

.chat-input textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(255, 69, 0, 0.15);
    background: rgba(255, 255, 255, 0.09);
}

.chat-input button {
    -webkit-appearance: none;
    appearance: none;
    width: 42px;
    height: 42px;
    padding: 0;
    margin: 0;
    flex-shrink: 0;
    border: none;
    outline: none;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    touch-action: manipulation;
    line-height: 0;
    font-size: 0;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.chat-input button:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(255, 69, 0, 0.4);
}

.chat-input button:active { transform: scale(0.92); }

.chat-input button:disabled {
    background: var(--glass-border);
    cursor: not-allowed;
    box-shadow: none;
}

/* ---------- Mobile: full screen bottom sheet ---------- */

@media (max-width: 640px) {
    .chat-toggle-btn { bottom: 18px; right: 18px; }

    .chat-backdrop { display: block; }
    #chatbot-root:has(.chat-panel.open) .chat-backdrop { opacity: 1; pointer-events: auto; }

    .chat-panel {
        top: auto; bottom: 0; right: 0; left: 0;
        width: 100%; max-width: 100%;
        height: 92dvh; max-height: 92dvh;
        border-radius: 24px 24px 0 0;
        transform: translateY(100%);
        transform-origin: bottom center;
        padding-bottom: env(safe-area-inset-bottom);
    }

    .chat-panel.open { transform: translateY(0); }

    .chat-input textarea, .suggestion-card, .icon-btn { min-height: 44px; }
    .chat-header { padding-top: max(18px, env(safe-area-inset-top)); }
}

/* ---------- Accessibility ---------- */

.chat-toggle-btn:focus-visible,
.icon-btn:focus-visible,
.suggestion-card:focus-visible,
.chat-input textarea:focus-visible,
.chat-input button:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    .chat-toggle-btn { animation: none; }
    .message-row { animation: none; opacity: 1; transform: none; }
    .typing-bubble span { animation: none; }
    .chat-panel { transition: none; }
}