:root {
    --bg: #0b0b14;
    --glass: rgba(255, 255, 255, 0.06);
    --glass-strong: rgba(255, 255, 255, 0.1);
    --border: rgba(255, 255, 255, 0.12);
    --text: #ecebf5;
    --muted: #9a98b0;
    --violet: #8b5cf6;
    --cyan: #22d3ee;
    --grad: linear-gradient(135deg, var(--violet), var(--cyan));
}

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

body {
    font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 24px;
    position: relative;
    overflow-x: hidden;
}

body::before, body::after {
    content: '';
    position: fixed;
    width: 520px; height: 520px;
    border-radius: 50%;
    filter: blur(110px);
    opacity: 0.35;
    z-index: 0;
    pointer-events: none;
    animation: drift 18s ease-in-out infinite alternate;
}
body::before { background: var(--violet); top: -140px; left: -120px; }
body::after { background: var(--cyan); bottom: -160px; right: -120px; animation-delay: -9s; }

@keyframes drift {
    to { transform: translate(80px, 60px) scale(1.15); }
}

.container {
    position: relative;
    z-index: 1;
    max-width: 1100px;
    margin: 0 auto;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 24px;
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

header { padding: 40px 30px 24px; text-align: center; }
header h1 {
    font-size: 2.4em;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 10px;
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
header p { color: var(--muted); font-size: 1.05em; }

header { position: relative; padding-top: 44px; padding-bottom: 32px; }
.mascot { position: absolute; top: 50%; width: 120px; margin-top: -62px; filter: drop-shadow(0 12px 24px rgba(139, 92, 246, 0.35)); }
.mascot-left { left: 14%; }
.mascot-right { right: 14%; filter: drop-shadow(0 12px 24px rgba(34, 211, 238, 0.3)); }
.m-delay { animation-delay: -1.6s; }
.m-spark { transform-box: fill-box; transform-origin: center; animation: spark 2s ease-in-out infinite; }
.m-spark2 { animation-delay: -1s; }
@keyframes spark { 50% { transform: scale(0.5) rotate(45deg); opacity: 0.5; } }
@media (max-width: 1000px) { .mascot { display: none; } }
.mascot svg { width: 100%; height: auto; overflow: visible; }
.m-float { animation: bob 3.2s ease-in-out infinite; }
.m-shadow { transform-origin: 70px 142px; animation: shadow 3.2s ease-in-out infinite; }
.m-eyes { transform-origin: 70px 64px; animation: blink 4.5s infinite; }
.m-arm-r { transform-origin: 114px 92px; animation: wave 2.4s ease-in-out infinite; }
@keyframes bob { 50% { transform: translateY(-8px); } }
@keyframes shadow { 50% { transform: scaleX(0.8); opacity: 0.2; } }
@keyframes blink { 0%, 92%, 100% { transform: scaleY(1); } 95% { transform: scaleY(0.1); } }
@keyframes wave { 50% { transform: rotate(-18deg); } }
@media (prefers-reduced-motion: reduce) { .mascot * { animation: none !important; } }

.tabs {
    display: flex;
    gap: 6px;
    width: fit-content;
    max-width: calc(100% - 40px);
    margin: 0 auto 8px;
    padding: 6px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    border-radius: 999px;
    overflow-x: auto;
}
.tab-button {
    padding: 10px 22px;
    background: none;
    border: none;
    border-radius: 999px;
    cursor: pointer;
    font: inherit;
    font-weight: 600;
    color: var(--muted);
    white-space: nowrap;
    transition: all 0.25s;
}
.tab-button:hover { color: var(--text); background: var(--glass); }
.tab-button.active { color: #fff; background: var(--grad); box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4); }

.tab-content { display: none; padding: 24px 30px 30px; min-height: 480px; }
.tab-content.active { display: block; animation: fade 0.35s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } }

/* 채팅 */
.chat-container { display: flex; flex-direction: column; height: 600px; }
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border);
    border-radius: 18px;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
}
.message {
    margin-bottom: 14px;
    padding: 12px 18px;
    border-radius: 18px;
    max-width: 78%;
    word-wrap: break-word;
    line-height: 1.6;
}
.message.user {
    background: var(--grad);
    color: #fff;
    margin-left: auto;
    border-bottom-right-radius: 6px;
    text-align: right;
}
.message.assistant {
    background: var(--glass-strong);
    border: 1px solid var(--border);
    border-bottom-left-radius: 6px;
}
.message-header { font-weight: 700; margin-bottom: 4px; font-size: 0.85em; opacity: 0.85; }
.message-content { line-height: 1.7; }
.usage-info {
    font-size: 0.8em;
    color: var(--muted);
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
}

.chat-input-container { display: flex; gap: 10px; }

input[type="text"], input[type="url"], textarea {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    border-radius: 14px;
    color: var(--text);
    font: inherit;
    padding: 13px 18px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}
input::placeholder, textarea::placeholder { color: var(--muted); }
input:focus, textarea:focus {
    border-color: var(--violet);
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.2);
}
.chat-input-container input { flex: 1; border-radius: 999px; }

button { font: inherit; }
.chat-input-container button,
.button-group button,
.web-container button {
    padding: 12px 24px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--glass-strong);
    color: var(--text);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
#chat-send-btn, .button-group button:first-child, #web-summarize-btn {
    background: var(--grad);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.35);
}
.chat-input-container button:hover,
.button-group button:hover,
.web-container button:hover { transform: translateY(-1px); filter: brightness(1.12); }
button:active { transform: scale(0.98); }

/* 멀티모달 */
.multimodal-container { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.input-section { display: flex; flex-direction: column; gap: 14px; }
.input-section textarea { resize: vertical; }
.file-upload-section { display: flex; flex-direction: column; gap: 10px; }
.file-label {
    padding: 26px 14px;
    border: 2px dashed rgba(139, 92, 246, 0.5);
    border-radius: 16px;
    background: rgba(139, 92, 246, 0.07);
    cursor: pointer;
    text-align: center;
    font-weight: 600;
    color: #c4b5fd;
    transition: all 0.25s;
}
.file-label:hover { background: rgba(139, 92, 246, 0.16); border-color: var(--cyan); color: #fff; }
.file-upload-section input[type="file"] { display: none; }
.image-preview { display: flex; flex-wrap: wrap; gap: 10px; }
.image-preview-item {
    position: relative;
    width: 96px; height: 96px;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
}
.image-preview-item img { width: 100%; height: 100%; object-fit: cover; }
.image-preview-item .remove-btn {
    position: absolute; top: 5px; right: 5px;
    width: 24px; height: 24px;
    border: none; border-radius: 50%;
    background: rgba(0, 0, 0, 0.7);
    color: #fff; cursor: pointer; font-size: 14px;
}
.image-preview-item .remove-btn:hover { background: #ef4444; }
.button-group { display: flex; gap: 10px; }
.button-group button { flex: 1; }

.multimodal-response, .web-response {
    padding: 20px;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border);
    border-radius: 18px;
    line-height: 1.8;
}
.multimodal-response { max-height: 500px; overflow-y: auto; }

/* 웹 요약 */
.web-container { display: flex; flex-direction: column; gap: 20px; }

.loading { text-align: center; padding: 20px; color: var(--muted); animation: pulse 1.4s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: 0.45; } }
.error {
    background: rgba(239, 68, 68, 0.12);
    color: #fca5a5;
    padding: 14px 16px;
    border-radius: 12px;
    border: 1px solid rgba(239, 68, 68, 0.4);
}

footer { padding: 20px; text-align: center; color: var(--muted); font-size: 0.85em; border-top: 1px solid var(--border); }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.18); border-radius: 8px; }

@media (max-width: 768px) {
    body { padding: 12px; }
    .multimodal-container { grid-template-columns: 1fr; }
    .message { max-width: 90%; }
    header h1 { font-size: 1.8em; }
    .tab-content { padding: 18px 16px 24px; }
}