:root {
    --sponge: #ffe14d;
    --sponge-dark: #f5c400;
    --sponge-pore: #e8b800;
    --pants: #8b5a2b;
    --pants-dark: #5e3a16;
    --sea: #4fc3f7;
    --sea-deep: #0288d1;
    --sand: #f6dfa4;
    --patrick: #ff8fb1;
    --patrick-dark: #e0587f;
    --krab: #ff5a36;
    --krab-dark: #c93a1c;
    --jelly: #b57edc;
    --kelp: #3dbb6a;
    --ink: #3b2a14;
    --cream: #fffbe6;
    --font-sans: 'Jua', 'Noto Sans KR', 'Malgun Gothic', 'Apple SD Gothic Neo', 'Segoe UI', -apple-system, Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    color: var(--ink);
    min-height: 100vh;
    padding: 24px 20px 40px;
    background: linear-gradient(180deg, #b3e5fc 0%, var(--sea) 45%, var(--sea-deep) 82%, var(--sand) 82.1%, var(--sand) 100%);
    background-attachment: fixed;
    position: relative;
    overflow-x: hidden;
}

/* 떠오르는 비눗방울 */
body::before, body::after {
    content: '';
    position: fixed;
    bottom: -40px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.8);
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.15) 60%);
    pointer-events: none;
    z-index: 0;
}
body::before {
    left: 6%; width: 36px; height: 36px;
    box-shadow: 140px -80px 0 -6px rgba(255,255,255,0.5), 320px -30px 0 2px rgba(255,255,255,0.35), 520px -120px 0 -4px rgba(255,255,255,0.45);
    animation: bubble-rise 14s linear infinite;
}
body::after {
    right: 8%; width: 24px; height: 24px;
    box-shadow: -160px -60px 0 4px rgba(255,255,255,0.4), -380px -100px 0 -2px rgba(255,255,255,0.5);
    animation: bubble-rise 19s linear infinite 3s;
}
@keyframes bubble-rise {
    from { transform: translateY(0); opacity: 0.9; }
    to   { transform: translateY(-115vh); opacity: 0; }
}

.container {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    background: var(--cream);
    border: 6px solid var(--pants);
    border-radius: 28px;
    box-shadow: 0 10px 0 var(--pants-dark), 0 24px 40px rgba(0, 60, 100, 0.35);
    overflow: hidden;
}

/* 헤더: 스펀지 질감 */
header {
    position: relative;
    padding: 30px 32px 34px;
    text-align: center;
    color: var(--pants-dark);
    background-color: var(--sponge);
    background-image:
        radial-gradient(circle at 12% 30%, var(--sponge-pore) 0 9px, transparent 10px),
        radial-gradient(circle at 28% 70%, var(--sponge-pore) 0 6px, transparent 7px),
        radial-gradient(circle at 72% 25%, var(--sponge-pore) 0 7px, transparent 8px),
        radial-gradient(circle at 88% 65%, var(--sponge-pore) 0 11px, transparent 12px),
        radial-gradient(circle at 50% 82%, var(--sponge-pore) 0 5px, transparent 6px);
    border-bottom: 6px solid var(--pants);
}
header::after {
    content: '';
    position: absolute;
    left: 0; right: 0; bottom: 0;
    height: 10px;
    background: repeating-linear-gradient(90deg, var(--pants) 0 18px, #a06a33 18px 36px);
}
header h1 {
    font-size: 2.6em;
    font-weight: 400;
    letter-spacing: 0.01em;
    margin-bottom: 8px;
    color: var(--pants-dark);
    text-shadow: 3px 3px 0 #fff, 5px 5px 0 rgba(94, 58, 22, 0.25);
}
header h1 .wiggle {
    display: inline-block;
    animation: wiggle 2.2s ease-in-out infinite;
    transform-origin: 50% 80%;
}
@keyframes wiggle {
    0%, 100% { transform: rotate(-8deg); }
    50%      { transform: rotate(10deg) translateY(-3px); }
}
header p { font-size: 1.15em; color: var(--pants); }

/* 탭 */
.tabs {
    display: flex;
    gap: 10px;
    padding: 16px 24px 4px;
    background: var(--cream);
    flex-wrap: wrap;
}
.tab-button {
    flex: 1;
    min-width: 120px;
    padding: 12px 18px;
    background: var(--sand);
    color: var(--pants);
    border: 3px solid var(--pants);
    border-radius: 999px;
    cursor: pointer;
    font-family: inherit;
    font-size: 1.05em;
    box-shadow: 0 4px 0 var(--pants);
    transition: transform 0.1s, box-shadow 0.1s, background 0.15s;
}
.tab-button:hover {
    background: #ffeaa8;
    transform: translateY(-2px);
    box-shadow: 0 6px 0 var(--pants);
}
.tab-button.active {
    background: var(--patrick);
    color: #fff;
    text-shadow: 1px 1px 0 var(--patrick-dark);
    border-color: var(--patrick-dark);
    box-shadow: 0 4px 0 var(--patrick-dark);
    transform: translateY(0);
}
.tab-content { display: none; padding: 24px 28px 32px; min-height: 500px; }
.tab-content.active { display: block; }

/* 채팅 */
.chat-container { display: flex; flex-direction: column; height: 600px; }
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    margin-bottom: 18px;
    background:
        radial-gradient(circle at 15% 20%, rgba(255,255,255,0.7) 0 6px, transparent 7px),
        radial-gradient(circle at 85% 60%, rgba(255,255,255,0.6) 0 9px, transparent 10px),
        radial-gradient(circle at 40% 85%, rgba(255,255,255,0.6) 0 5px, transparent 6px),
        linear-gradient(180deg, #e1f5fe, #b3e5fc);
    border: 4px solid var(--sea-deep);
    border-radius: 20px;
    box-shadow: inset 0 4px 12px rgba(2, 136, 209, 0.25);
}
.message {
    margin-bottom: 16px;
    padding: 12px 18px;
    border-radius: 22px;
    max-width: 80%;
    word-wrap: break-word;
    border: 3px solid var(--pants);
    box-shadow: 0 4px 0 rgba(94, 58, 22, 0.35);
}
.message.user {
    background: var(--patrick);
    color: #fff;
    border-color: var(--patrick-dark);
    box-shadow: 0 4px 0 var(--patrick-dark);
    border-bottom-right-radius: 4px;
    margin-left: auto;
    text-align: right;
    text-shadow: 1px 1px 0 rgba(224, 88, 127, 0.7);
}
.message.assistant {
    background: var(--sponge);
    color: var(--ink);
    border-bottom-left-radius: 4px;
}
.message-header { margin-bottom: 4px; font-size: 0.95em; letter-spacing: 0.02em; }
.message-content {
    line-height: 1.65;
    font-family: 'Noto Sans KR', 'Malgun Gothic', 'Apple SD Gothic Neo', 'Segoe UI', sans-serif;
}
.usage-info {
    font-size: 0.82em;
    color: var(--pants);
    margin-top: 8px;
    padding-top: 8px;
    border-top: 2px dashed var(--pants);
    font-family: 'Noto Sans KR', 'Malgun Gothic', 'Segoe UI', sans-serif;
}

.chat-input-container { display: flex; gap: 10px; }
.chat-input-container input {
    flex: 1;
    padding: 13px 20px;
    border: 4px solid var(--pants);
    border-radius: 999px;
    background: #fff;
    color: var(--ink);
    font-family: inherit;
    font-size: 1.05em;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.chat-input-container input:focus {
    border-color: var(--sea-deep);
    box-shadow: 0 0 0 4px rgba(79, 195, 247, 0.5);
}

/* 집게리아 버튼 (눌리는 3D) */
.chat-input-container button,
.button-group button:first-child,
.web-container button {
    padding: 12px 26px;
    background: var(--krab);
    color: #fff;
    border: 3px solid var(--krab-dark);
    border-radius: 999px;
    font-family: inherit;
    font-size: 1.05em;
    cursor: pointer;
    text-shadow: 1px 1px 0 var(--krab-dark);
    box-shadow: 0 5px 0 var(--krab-dark);
    transition: transform 0.08s, box-shadow 0.08s, background 0.15s;
}
.chat-input-container button:hover,
.button-group button:first-child:hover,
.web-container button:hover { background: #ff7350; }
.chat-input-container button:active,
.button-group button:first-child:active,
.web-container button:active {
    transform: translateY(4px);
    box-shadow: 0 1px 0 var(--krab-dark);
}

/* 보조(초기화) 버튼: 해파리 보라 */
.chat-input-container button:last-child,
.button-group button:last-child {
    background: var(--jelly);
    border-color: #8a56b3;
    text-shadow: 1px 1px 0 #8a56b3;
    box-shadow: 0 5px 0 #8a56b3;
    color: #fff;
}
.chat-input-container button:last-child:hover,
.button-group button:last-child:hover { background: #c795e6; }
.chat-input-container button:last-child:active,
.button-group button:last-child:active {
    transform: translateY(4px);
    box-shadow: 0 1px 0 #8a56b3;
}

/* 멀티모달 */
.multimodal-container { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.input-section { display: flex; flex-direction: column; gap: 16px; }
.input-section textarea {
    padding: 14px 18px;
    border: 4px solid var(--pants);
    border-radius: 20px;
    background: #fff;
    color: var(--ink);
    font-size: 1.05em;
    font-family: inherit;
    resize: vertical;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.input-section textarea:focus {
    border-color: var(--sea-deep);
    box-shadow: 0 0 0 4px rgba(79, 195, 247, 0.5);
}
.file-upload-section { display: flex; flex-direction: column; gap: 10px; }
.file-label {
    padding: 16px;
    background: #e1f5fe;
    border: 4px dashed var(--sea-deep);
    border-radius: 20px;
    cursor: pointer;
    text-align: center;
    color: var(--sea-deep);
    transition: background 0.15s, transform 0.1s;
}
.file-label:hover { background: #b3e5fc; transform: rotate(-1deg) scale(1.01); }
.file-upload-section input[type="file"] { display: none; }
.image-preview { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 6px; }
.image-preview-item {
    position: relative;
    width: 100px;
    height: 100px;
    border-radius: 16px;
    overflow: hidden;
    border: 4px solid var(--pants);
    box-shadow: 0 4px 0 rgba(94, 58, 22, 0.35);
    transition: transform 0.15s;
}
.image-preview-item:nth-child(odd)  { transform: rotate(-2deg); }
.image-preview-item:nth-child(even) { transform: rotate(2deg); }
.image-preview-item img { width: 100%; height: 100%; object-fit: cover; }
.image-preview-item .remove-btn {
    position: absolute;
    top: 4px; right: 4px;
    background: var(--krab);
    color: white;
    border: 2px solid #fff;
    border-radius: 50%;
    width: 24px; height: 24px;
    cursor: pointer;
    font-size: 13px;
    line-height: 1;
}
.button-group { display: flex; gap: 12px; }
.button-group button { flex: 1; padding: 12px; }
.multimodal-response {
    padding: 20px;
    background: var(--sponge);
    border: 4px solid var(--pants);
    border-radius: 20px;
    box-shadow: 0 5px 0 rgba(94, 58, 22, 0.35);
    max-height: 500px;
    overflow-y: auto;
}

/* 웹 요약 */
.web-container { display: flex; flex-direction: column; gap: 22px; }
.web-container .input-section { display: flex; flex-direction: column; gap: 16px; }
.web-container input[type="url"] {
    padding: 13px 20px;
    border: 4px solid var(--pants);
    border-radius: 999px;
    background: #fff;
    color: var(--ink);
    font-family: inherit;
    font-size: 1.05em;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.web-container input[type="url"]:focus {
    border-color: var(--sea-deep);
    box-shadow: 0 0 0 4px rgba(79, 195, 247, 0.5);
}
.web-response {
    padding: 20px;
    background: var(--sponge);
    border: 4px solid var(--pants);
    border-radius: 20px;
    box-shadow: 0 5px 0 rgba(94, 58, 22, 0.35);
    line-height: 1.8;
}
.web-response:empty, .multimodal-response:empty { display: none; }

.loading {
    text-align: center;
    padding: 20px;
    color: var(--pants);
    animation: bob 1.4s ease-in-out infinite;
}
@keyframes bob {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-6px); }
}
.error {
    background: #ffe0d6;
    color: var(--krab-dark);
    padding: 14px 18px;
    border-radius: 16px;
    border: 3px solid var(--krab);
}
.message.assistant.error { background: #ffe0d6; }

footer {
    position: relative;
    padding: 22px 20px 18px;
    text-align: center;
    color: var(--pants-dark);
    background: var(--sand);
    border-top: 6px solid var(--pants);
    font-size: 1em;
}

/* 반응형 */
@media (max-width: 768px) {
    body { padding: 12px 10px 30px; }
    .multimodal-container { grid-template-columns: 1fr; }
    .message { max-width: 92%; }
    header h1 { font-size: 1.8em; }
    .tab-content { padding: 18px 14px 26px; }
    .tabs { padding: 14px 14px 2px; }
}

@media (prefers-reduced-motion: reduce) {
    body::before, body::after, header h1 .wiggle, .loading { animation: none; }
}