:root {
    /* Dark Mode (Default) */
    --bg-color: #0a0a0c;
    --card-bg: rgba(20, 20, 25, 0.85);
    --gold: #d4af37;
    --gold-bright: #f9e29c;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent-red: #8b0000;
    --border-color: rgba(212, 175, 55, 0.3);
    --input-bg: rgba(255, 255, 255, 0.05);
    --item-bg: rgba(255, 255, 255, 0.03);
    --advice-bg: rgba(212, 175, 55, 0.1);
    --stars-opacity: 1;
}

body.light-mode {
    /* Light Mode (White/Ink Style) */
    --bg-color: #f4f1ea; /* 한지 느낌의 따뜻한 화이트 */
    --card-bg: rgba(255, 255, 255, 0.9);
    --gold: #8b6b15; /* 조금 더 짙은 황금색 */
    --gold-bright: #6b5310;
    --text-primary: #2c2c2c;
    --text-secondary: #5a5a5a;
    --border-color: rgba(139, 107, 21, 0.4);
    --input-bg: rgba(0, 0, 0, 0.03);
    --item-bg: rgba(0, 0, 0, 0.02);
    --advice-bg: rgba(139, 107, 21, 0.05);
    --stars-opacity: 0.1;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Noto Serif KR', serif;
    min-height: 100vh;
    overflow-x: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.3s, color 0.3s;
}

.stars-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(ellipse at bottom, #1B2735 0%, #090A0F 100%);
    opacity: var(--stars-opacity);
    transition: opacity 0.3s;
}

.container {
    width: 90%;
    max-width: 600px;
    padding: 2rem 0;
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

.main-title {
    font-size: 3.5rem;
    color: var(--text-primary);
    letter-spacing: -0.1rem;
    margin-bottom: 0.8rem;
    font-weight: 700;
}

.coding-text {
    color: var(--gold);
    font-family: 'JetBrains Mono', monospace;
    font-weight: 400;
    margin-left: 0.5rem;
    text-shadow: 0 0 20px rgba(212, 175, 55, 0.6);
    position: relative;
}

.coding-text::after {
    content: '_';
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

.sub-title {
    color: var(--text-secondary);
    font-size: 1rem;
    letter-spacing: 0.3rem;
    text-transform: uppercase;
    opacity: 0.8;
}

section {
    display: none;
}

section.active {
    display: block;
    animation: fadeIn 1s ease forwards;
}

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

/* Input Card */
.input-card, .result-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    transition: background-color 0.3s, border-color 0.3s;
}

.description {
    text-align: center;
    line-height: 1.6;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--gold);
    font-weight: 700;
}

input[type="text"], input[type="email"], select, textarea {
    width: 100%;
    padding: 0.8rem;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: inherit;
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--gold);
    background: var(--input-bg);
}

textarea {
    resize: none;
}

.birth-date-group {
    display: flex;
    gap: 0.5rem;
}

.birth-date-group select {
    flex: 1;
}

.gender-options, .calendar-options {
    display: flex;
    gap: 1.5rem;
    padding: 0.5rem 0;
}

.gender-options label, .calendar-options label {
    display: inline;
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 400;
}

.btn-submit, .btn-retry {
    width: 100%;
    padding: 1rem;
    margin-top: 1rem;
    background: linear-gradient(45deg, #8b6b15, #d4af37);
    border: none;
    border-radius: 4px;
    color: black;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-submit:hover, .btn-retry:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(212, 175, 55, 0.4);
}

/* Loading Section */
#loading-section {
    text-align: center;
    padding: 5rem 0;
}

.loader-circle {
    width: 60px;
    height: 60px;
    border: 3px solid rgba(212, 175, 55, 0.1);
    border-top: 3px solid var(--gold);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    animation: spin 1.5s linear infinite;
}

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

#loading-text {
    color: var(--gold);
    letter-spacing: 0.2rem;
}

/* Result Card */
.saju-display {
    display: flex;
    justify-content: space-around;
    margin-bottom: 2.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
}

.pillar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.pillar .label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.pillar .hanja {
    font-size: 1.8rem;
    color: var(--gold-bright);
    writing-mode: vertical-rl;
    text-orientation: upright;
}

.gold-text {
    color: var(--gold);
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.animal-illustration {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.image-frame {
    width: 100%;
    max-width: 550px;
    height: 350px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.9), 0 0 20px rgba(212, 175, 55, 0.15);
}

.image-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.9) contrast(1.1);
    transition: transform 0.5s ease;
}

.image-frame::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent 60%, rgba(10, 10, 12, 0.8));
    pointer-events: none;
}

.divider {
    width: 50px;
    height: 2px;
    background: var(--gold);
    margin: 0 auto 2rem;
}

.analysis-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.analysis-item {
    background: var(--item-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: background-color 0.3s, border-color 0.3s;
}

.analysis-label {
    color: var(--gold);
    font-size: 1.2rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.story-content {
    line-height: 1.8;
    color: var(--text-primary);
    white-space: pre-wrap;
}

.advice-box {
    background: var(--advice-bg);
    border-left: 4px solid var(--gold);
    padding: 1.5rem;
    margin-bottom: 2rem;
    transition: background-color 0.3s;
}

.advice-box h3 {
    color: var(--gold);
    font-size: 1rem;
    margin-bottom: 0.8rem;
}

.advice-box p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

footer {
    text-align: center;
    margin-top: 3rem;
    color: rgba(255, 255, 255, 0.2);
    font-size: 0.8rem;
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 100;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    color: var(--gold);
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    font-size: 1.2rem;
    transition: transform 0.2s, background-color 0.3s, border-color 0.3s;
}

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

.contact-area {
    display: block;
    margin-top: 4rem;
    padding-bottom: 2rem;
}

.small-card {
    padding: 1.5rem !important;
    max-width: 500px;
    margin: 0 auto;
}

.small-card .gold-text {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.small-card .description {
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.input-group-row {
    display: flex;
    gap: 0.8rem;
}

.input-group-row .input-group {
    flex: 1;
}

.small-card label {
    font-size: 0.8rem;
}

.small-card input, .small-card textarea {
    padding: 0.6rem;
    font-size: 0.9rem;
}

.btn-small {
    padding: 0.7rem !important;
    font-size: 0.95rem !important;
}

/* Responsive */
@media (max-width: 480px) {
    .main-title { font-size: 2.2rem; }
    .input-card, .result-card { padding: 1.5rem; }
}