:root {
    --primary-color: #4a3728;
    --accent-color: #a68b5c;
    --sky-blue: #f0f7ff;
    --cream-white: #fdfbf7;
    --light-gold: #fff9e6;
    --card-bg: rgba(255, 255, 255, 0.82);
    --text-color: #2c241e;
    --muted-text: #6d5b4e;
    --border-radius: 24px;
    --shadow: 0 12px 40px rgba(74, 55, 40, 0.15);
    --canvas-bg: linear-gradient(135deg, #fdfbf7 0%, #f0f7ff 50%, #fff9e6 100%);
}

/* 다크 모드 변수 정의 */
body.dark-mode {
    --primary-color: #e5e5e5;
    --accent-color: #ffd700;
    --card-bg: rgba(30, 30, 30, 0.85);
    --text-color: #f0f0f0;
    --muted-text: #aaaaaa;
    --shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
    --canvas-bg: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #020617 100%);
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Pretendard', -apple-system, sans-serif;
    background-color: #fdfbf7;
    transition: background-color 0.5s ease;
    position: relative;
    overflow-x: hidden;
    color: var(--text-color);
    line-height: 1.7;
    display: flex;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

#bgCanvas {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: -1;
    background: var(--canvas-bg);
    transition: background 0.5s ease;
}

/* 테마 토글 버튼 스타일 */
.theme-toggle {
    position: fixed;
    bottom: 25px;
    right: 25px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow);
    cursor: pointer;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
}

.container {
    width: 100%;
    max-width: 500px;
    margin-top: 3vh;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
}

header {
    margin-bottom: 25px;
    text-align: center;
}

header h1 {
    font-family: 'Noto Serif KR', serif;
    font-size: 2.2rem;
    color: var(--primary-color) !important;
    margin-bottom: 8px;
    letter-spacing: -1px;
    font-weight: 700;
}

header p {
    color: var(--muted-text) !important;
    font-size: 1rem;
    opacity: 0.8;
}

.intro-section {
    text-align: center;
    color: var(--muted-text);
    margin-bottom: 25px;
    font-size: 0.9rem;
    padding: 0 15px;
    line-height: 1.5;
}

.input-group {
    background: var(--card-bg);
    padding: 8px;
    border-radius: 28px;
    box-shadow: var(--shadow);
    display: flex;
    margin-bottom: 35px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    gap: 5px;
    transition: all 0.3s ease;
}

input[type="text"] {
    flex: 1;
    padding: 15px 15px 15px 20px;
    border: none;
    background: transparent;
    font-size: 1.1rem;
    outline: none;
    color: var(--text-color) !important;
    font-weight: 500;
    min-width: 0;
}

/* 개선된 축복 생성 버튼 디자인 */
button#generateBtn {
    padding: 0 24px;
    background-color: var(--accent-color);
    color: #ffffff !important; /* 기본 흰색 글자 */
    border: none;
    border-radius: 20px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
    flex-shrink: 0;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(166, 139, 92, 0.3);
}

button#generateBtn:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(166, 139, 92, 0.4);
}

/* 다크 모드 버튼 보정 */
body.dark-mode button#generateBtn {
    background-color: var(--accent-color);
    color: #1a1a1a !important; /* 금빛 배경에 어두운 글자색으로 대비 극대화 */
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.2);
}

button#generateBtn:disabled {
    background-color: #666;
    color: #999 !important;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.loading-area {
    text-align: center;
    padding: 40px 0;
}

.loading-area p {
    margin-top: 15px;
    color: var(--primary-color);
    font-size: 0.9rem;
    font-weight: 600;
}

.loader {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    margin: 0 auto;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.result-area { margin-top: 30px; }
.result-area.hidden, .loading-area.hidden { display: none; }

.selection-guide {
    text-align: center;
    font-size: 0.9rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 20px;
}

.cards-container {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.poem-card {
    background: var(--card-bg) !important;
    padding: 55px 28px 35px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    overflow: hidden;
    animation: fadeInUp 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
    transition: all 0.3s ease;
}

.poem-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 5px;
    background: linear-gradient(90deg, #d4af37, var(--accent-color), #d4af37);
    opacity: 0.8;
}

.card-tag {
    position: absolute;
    top: 18px; left: 25px;
    font-size: 0.75rem;
    background: rgba(166, 139, 92, 0.15);
    padding: 4px 14px;
    border-radius: 20px;
    color: var(--accent-color);
    font-weight: 800;
    letter-spacing: 0.5px;
    z-index: 2;
}

.poem-content {
    font-family: 'Noto Serif KR', serif;
    font-size: 1.25rem;
    text-align: left;
    margin-bottom: 30px;
    word-break: keep-all;
    color: var(--text-color) !important;
    font-weight: 500;
    margin-top: 10px;
}

.poem-line {
    margin-bottom: 18px;
    line-height: 1.6;
}

.first-char {
    color: var(--accent-color) !important;
    font-weight: 800 !important;
    font-size: 1.6rem !important;
    margin-right: 4px !important;
    display: inline-block !important;
    position: relative;
}

.first-char::after {
    content: '';
    position: absolute;
    bottom: 2px; left: 0; width: 100%; height: 6px;
    background: rgba(166, 139, 92, 0.15);
    z-index: -1;
}

.card-btn-group {
    display: flex;
    gap: 12px;
    margin-top: 25px;
}

.action-btn {
    flex: 1;
    padding: 12px;
    font-size: 0.9rem;
    font-weight: 700;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color) !important;
}

.copy-btn {
    background-color: rgba(166, 139, 92, 0.1);
}

.save-btn {
    background-color: var(--primary-color);
    color: #ffffff !important;
}

/* 다크 모드 이미지 저장 버튼 가시성 강화 */
body.dark-mode .save-btn {
    background-color: #5d4037; /* 다크 모드에 어울리는 깊은 브라운 */
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #ffffff !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

body.dark-mode .save-btn:hover {
    background-color: #6d4c41;
}

.action-btn.success {
    background-color: #2e7d32;
    color: #fff !important;
}

.guide-section {
    margin-top: 50px;
    background: var(--card-bg);
    padding: 25px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.guide-section h2 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.guide-section ul {
    list-style: none;
    padding: 0;
}

.guide-section li {
    font-size: 0.85rem;
    color: var(--muted-text);
    margin-bottom: 8px;
    padding-left: 18px;
    position: relative;
}

.guide-section li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

.verse-line {
    margin-top: 25px;
    padding-top: 15px;
    border-top: 1px dashed rgba(166, 139, 92, 0.3);
    text-align: center;
    animation: fadeIn 0.8s forwards;
}

.verse-label {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--accent-color) !important;
    font-weight: 700;
    margin-bottom: 10px;
}

.verse-line p {
    font-size: 0.95rem;
    color: var(--primary-color) !important;
    font-style: italic;
    line-height: 1.5;
    font-weight: 500;
}

footer {
    margin-top: 60px;
    text-align: center;
    padding-bottom: 50px;
}

.footer-links {
    margin-bottom: 15px;
    font-size: 0.8rem;
}

.footer-links a {
    color: var(--muted-text);
    text-decoration: none;
}

.copyright {
    font-size: 0.75rem;
    color: var(--muted-text);
    opacity: 0.6;
    margin-bottom: 20px;
}

.blessing-footer {
    font-size: 0.85rem;
    color: var(--primary-color) !important;
    font-weight: 500;
}

@media (max-width: 480px) {
    body { padding: 15px; }
    header h1 { font-size: 1.8rem; }
    .input-group { border-radius: 16px; }
    .poem-card { padding: 60px 20px 30px; }
    .poem-content { font-size: 1.15rem; }
    .theme-toggle { bottom: 20px; right: 20px; width: 45px; height: 45px; }
}