/* ========== 기본 리셋 & 글로벌 ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --surface-hover: #22263a;
    --border: #2a2e3e;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a6;
    --accent: #6c63ff;
    --accent-hover: #5a52e0;
    --accent-glow: rgba(108, 99, 255, 0.25);
    --success: #34d399;
    --error: #f87171;
    --radius: 14px;
    --radius-sm: 8px;
    --font: 'Inter', -apple-system, 'Malgun Gothic', sans-serif;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 20px;
    line-height: 1.6;
}

/* ========== 레이아웃 ========== */
.app-container {
    width: 100%;
    max-width: 1100px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.app-header {
    text-align: center;
    padding: 40px 0 10px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.logo-icon {
    font-size: 2.2rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6c63ff, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 8px;
}

/* ========== 업로드 카드 ========== */
.upload-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    transition: border-color var(--transition);
}

.upload-card:hover {
    border-color: var(--accent);
}

/* 드롭존 */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-sm);
    padding: 48px 24px;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 180px;
    position: relative;
    overflow: hidden;
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.drop-zone-content { text-align: center; }

.drop-icon {
    font-size: 3rem;
    margin-bottom: 12px;
    opacity: 0.8;
}

.drop-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.drop-desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.supported-formats {
    margin-top: 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: rgba(255,255,255,0.05);
    padding: 4px 12px;
    border-radius: 999px;
    display: inline-block;
}

.preview-img {
    display: none;
    max-width: 100%;
    max-height: 350px;
    border-radius: var(--radius-sm);
    object-fit: contain;
}

/* 언어 선택 */
.lang-options {
    display: flex;
    align-items: flex-end;
    gap: 12px;
}

.lang-select-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.lang-select-group label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.lang-arrow {
    font-size: 1.4rem;
    color: var(--accent);
    padding-bottom: 8px;
    font-weight: bold;
}

select {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.9rem;
    cursor: pointer;
    transition: border-color var(--transition);
    appearance: none;
    -webkit-appearance: none;
}

select:hover, select:focus {
    border-color: var(--accent);
    outline: none;
}

/* 전송 버튼 */
.submit-btn {
    width: 100%;
    padding: 14px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.submit-btn:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.submit-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
    margin-right: 6px;
}

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

/* ========== 메시지 ========== */
.message-error {
    background: rgba(248, 113, 113, 0.12);
    color: var(--error);
    border: 1px solid rgba(248, 113, 113, 0.3);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    text-align: center;
}

/* ========== 결과 영역 ========== */
.result-container {
    display: none;
    gap: 20px;
    flex-wrap: wrap;
}

.result-container.visible {
    display: flex;
}

.pane {
    flex: 1 1 45%;
    min-width: 300px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.pane h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.result-img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

/* 액션 버튼 */
.action-btns {
    display: flex;
    gap: 10px;
    width: 100%;
}

.action-btn {
    flex: 1;
    padding: 11px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg);
    color: var(--text-primary);
    font-family: var(--font);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition);
}

.action-btn:hover {
    border-color: var(--accent);
    background: var(--accent-glow);
}

/* ========== 푸터 ========== */
.app-footer {
    text-align: center;
    padding: 20px 0;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* ========== 반응형 ========== */
@media (max-width: 680px) {
    .result-container { flex-direction: column; }
    .pane { min-width: auto; }
    .lang-options { flex-direction: column; }
    .lang-arrow { text-align: center; padding: 0; transform: rotate(90deg); }
}