:root {
    --bg-color: #F8F9FA;
    --text-color: #333;
    --primary-color: #C19A6B; /* Muted Gold/Bronze */
    --secondary-color: #8B7355;
    --border-color: #e0d8c8;
    --box-bg: #fff;
    --input-bg: #fff;
    --sidebar-bg: #fff;
    --preview-bg: #f0f2f5;
    --accent-color: #e25555;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans KR', 'Nanum Myeongjo', serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    height: 100vh;
    overflow: hidden;
}

/* Studio Layout */
.studio-container {
    display: flex;
    height: 100vh;
}

/* Sidebar Editor */
.editor-panel {
    width: 420px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid #ddd;
    display: flex;
    flex-direction: column;
    box-shadow: 2px 0 15px rgba(0,0,0,0.05);
    z-index: 10;
}

.editor-header {
    padding: 20px;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #fff;
}

.editor-header h2 {
    margin: 0;
    font-size: 1.1em;
    color: #222;
    font-weight: 700;
}

.primary-btn {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 10px 18px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9em;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.primary-btn:hover {
    background-color: #a67c52;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

.editor-body {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    background-color: #fcfcfc;
}

/* Editor Form Groups with Accordion effect */
.form-group {
    margin-bottom: 12px;
    background: #fff;
    border-radius: 10px;
    border: 1px solid #eee;
    overflow: hidden;
    transition: all 0.3s ease;
}

.form-group-header {
    padding: 15px 20px;
    background: #fff;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.form-group-header h3 {
    margin: 0;
    font-size: 0.95em;
    color: #444;
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-group-header h3 i {
    color: var(--primary-color);
    width: 18px;
    text-align: center;
}

.form-group-content {
    padding: 0 20px 20px;
    display: none; /* JS will toggle this */
}

.form-group.active .form-group-content {
    display: block;
}

.form-group-header i.chevron {
    transition: transform 0.3s ease;
    font-size: 0.8em;
    color: #bbb;
}

.form-group.active .chevron {
    transform: rotate(180deg);
}

.form-group label {
    display: block;
    margin-top: 15px;
    font-size: 0.85em;
    color: #666;
    font-weight: 500;
}

.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 10px 12px;
    margin-top: 6px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.95em;
    transition: border-color 0.2s;
}

.form-group input:focus, .form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
}

.btn-add-item {
    background: #f0f0f0;
    border: 1px dashed #ccc;
    color: #666;
    width: 100%;
    padding: 10px;
    margin-top: 15px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85em;
    transition: all 0.2s;
}

.btn-add-item:hover {
    background: #e8e8e8;
    border-color: var(--primary-color);
}

.item-row {
    display: flex;
    gap: 5px;
    margin-bottom: 8px;
}

.item-row input {
    margin-top: 0;
}

.btn-remove {
    background: #ffeded;
    color: #e25555;
    border: 1px solid #ffd1d1;
    border-radius: 4px;
    padding: 0 8px;
    cursor: pointer;
}

/* Preview Panel */
.preview-panel {
    flex: 1;
    background-color: var(--preview-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    padding: 20px;
}

.preview-device {
    width: 375px;
    height: 812px;
    background-color: #333;
    border-radius: 48px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.15);
    overflow: hidden;
    position: relative;
    border: 10px solid #222;
    padding: 5px; /* Bezel padding */
}

/* Speaker/Notch area mockup */
.preview-device::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 25px;
    background: #222;
    border-radius: 0 0 15px 15px;
    z-index: 100;
}

.mobile-container {
    width: 100%;
    height: 100%;
    overflow-y: auto;
    background-color: #FDF5E6;
    color: #333;
    scrollbar-width: none;
    -ms-overflow-style: none;
    border-radius: 35px;
}

.mobile-container::-webkit-scrollbar { display: none; }

/* Invitation Content Styling */
h1, h2, h3, .hero-names, .section-title {
    font-family: 'Nanum Myeongjo', serif;
    font-weight: 700;
}

section {
    padding: 70px 25px;
    border-bottom: 1px solid #e0d8c8;
    text-align: center;
}

.section-title {
    font-size: 1.3em;
    color: var(--primary-color);
    margin-bottom: 40px;
    letter-spacing: 0.2em;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 1px;
    background-color: var(--primary-color);
}

/* Hero Section */
.hero {
    position: relative;
    text-align: center;
    padding-bottom: 50px;
}

.hero-image {
    width: 100%;
    height: 550px;
    overflow: hidden;
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-text {
    padding: 40px 20px 0;
}

.hero-date {
    font-family: 'Noto Sans KR', sans-serif;
    font-size: 0.85em;
    color: var(--secondary-color);
    letter-spacing: 0.15em;
    margin-bottom: 10px;
}

.hero-names {
    font-size: 2.2em;
    margin: 15px 0;
    font-weight: 400;
}

.hero-location {
    font-size: 0.9em;
    color: #666;
    margin-top: 15px;
}

/* Greeting */
.greeting-message {
    line-height: 2;
    font-size: 0.95em;
    color: #444;
}

.parents-info {
    margin-top: 50px;
    font-size: 1.05em;
}

.parents-info p { margin: 8px 0; }

.parents-info .relation {
    font-size: 0.85em;
    color: #999;
    margin: 0 8px;
}

/* Gallery - Grid */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    margin-top: 20px;
}

.gallery-item {
    aspect-ratio: 1 / 1;
    overflow: hidden;
    cursor: pointer;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s;
}

.gallery-item:hover img {
    transform: scale(1.08);
}

/* Account Section (Accordion) */
.account-box {
    margin-top: 20px;
}

.acc-group {
    margin-bottom: 10px;
    border: 1px solid #e0d8c8;
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
}

.acc-header {
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95em;
}

.acc-content {
    display: none;
    padding: 0 15px 15px;
    text-align: left;
}

.acc-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-top: 1px solid #f0f0f0;
}

.acc-info {
    font-size: 0.9em;
}

.acc-info span {
    display: block;
    color: #999;
    font-size: 0.85em;
    margin-bottom: 2px;
}

.copy-btn {
    background: #f8f8f8;
    border: 1px solid #ddd;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.8em;
    cursor: pointer;
}

.copy-btn:active {
    background: #eee;
}

/* Guestbook */
.guest-form {
    text-align: left;
    margin-bottom: 30px;
}

.guest-form input, .guest-form textarea {
    width: 100%;
    border: 1px solid #e0d8c8;
    border-radius: 4px;
    padding: 8px 12px;
    margin-bottom: 10px;
    font-size: 0.9em;
}

.btn-submit {
    width: 100%;
    background: var(--primary-color);
    color: #fff;
    border: none;
    padding: 12px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
}

.guest-list {
    text-align: left;
}

.guest-item {
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
}

.guest-meta {
    font-size: 0.8em;
    color: #999;
    margin-bottom: 5px;
    display: flex;
    justify-content: space-between;
}

.guest-body {
    font-size: 0.9em;
    line-height: 1.5;
}

/* Common Animation */
.section-fade {
    opacity: 0;
    transform: translateY(30px);
    transition: all 1s ease-out;
}

.section-fade.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Modal UI */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0; top: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(8px);
}

.modal-content {
    background: #fff;
    margin: 50px auto;
    padding: 30px;
    border-radius: 20px;
    width: 90%;
    max-width: 900px;
    position: relative;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

#export-code {
    width: 100%;
    height: 450px;
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 20px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    border-radius: 12px;
    border: none;
    margin: 20px 0;
}

/* Utils */
.heart { color: var(--accent-color); font-size: 0.9em; margin: 0 5px; }
.highlight { color: var(--primary-color); font-weight: 700; }

@media (max-width: 900px) {
    .studio-container { flex-direction: column; }
    .editor-panel { width: 100%; height: 45vh; border-right: none; border-bottom: 1px solid #ddd; }
    .preview-panel { height: 55vh; padding: 10px; }
    .preview-device { width: 320px; height: 100%; border-radius: 30px; }
}