:root {
    --bg-color: #0f172a;
    --mesh-color-1: #3b0764;
    --mesh-color-2: #1e1b4b;
    --mesh-color-3: #020617;
    
    --glass-bg: rgba(30, 41, 59, 0.4);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    
    --accent: #8b5cf6;
    --accent-hover: #7c3aed;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --danger: #ef4444;
    --success: #10b981;
    
    --radius-lg: 16px;
    --radius-md: 8px;
    
    --font-family: 'Pretendard', 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem 1rem;
    overflow-x: hidden;
}

.background-mesh {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: radial-gradient(at 0% 0%, var(--mesh-color-1) 0px, transparent 50%),
                radial-gradient(at 100% 0%, var(--mesh-color-2) 0px, transparent 50%),
                radial-gradient(at 100% 100%, var(--mesh-color-1) 0px, transparent 50%),
                radial-gradient(at 0% 100%, var(--mesh-color-3) 0px, transparent 50%);
    background-color: var(--bg-color);
}

.container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 0.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-main);
}

.logo i {
    color: var(--accent);
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
    padding: 2rem;
}

.input-group {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.input-field {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.title-field {
    flex: 2;
    min-width: 250px;
}

.seq-field {
    flex: 3;
    min-width: 250px;
}

.input-field label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 600;
}

input[type="text"], input[type="password"] {
    width: 100%;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 1rem;
    outline: none;
    transition: all 0.2s ease;
}

input[type="text"]:focus, input[type="password"]:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.2);
}

.search-wrapper {
    display: flex;
    gap: 0.5rem;
}

.search-wrapper input {
    flex: 1;
}

button {
    font-family: var(--font-family);
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    border-radius: var(--radius-md);
    padding: 0.75rem 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.primary-btn {
    background-color: var(--accent);
    color: white;
}

.primary-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.secondary-btn {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    border: 1px solid var(--glass-border);
}

.secondary-btn:hover {
    background-color: rgba(255, 255, 255, 0.15);
}

.glass-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    border-radius: var(--radius-md);
}

.glass-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.accent-btn {
    background-color: var(--primary);
    color: white;
    padding: 0.75rem 2rem;
    font-size: 1.05rem;
}

.accent-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.status-bar {
    background: rgba(15, 23, 42, 0.5);
    border-left: 4px solid var(--primary);
    padding: 0.75rem 1rem;
    border-radius: 4px;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-bar.success {
    border-left-color: var(--success);
    color: var(--success);
}

.status-bar.error {
    border-left-color: var(--danger);
    color: var(--danger);
}

.sections-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
    max-height: 50vh;
    overflow-y: auto;
    padding-right: 0.5rem;
}

/* Scrollbar styling */
.sections-container::-webkit-scrollbar {
    width: 6px;
}
.sections-container::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
}
.sections-container::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 10px;
}

.section-card {
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    animation: fadeIn 0.3s ease;
}

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

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-header input[type="text"] {
    width: 80px;
    padding: 0.4rem;
    font-size: 0.9rem;
    font-weight: 600;
    text-align: center;
}

.remove-btn {
    background: transparent;
    color: var(--text-muted);
    padding: 0.4rem;
    margin-left: auto;
}

.remove-btn:hover {
    color: var(--danger);
}

textarea {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 0.95rem;
    line-height: 1.5;
    resize: vertical;
    min-height: 100px;
    outline: none;
    transition: border-color 0.2s;
}

textarea:focus {
    border-color: var(--accent);
}

.action-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--glass-border);
    padding-top: 1.5rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    justify-content: center;
    align-items: center;
}

.modal.show {
    display: flex;
    animation: fadeIn 0.2s ease;
}

.modal-content {
    width: 90%;
    max-width: 400px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-btn {
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
}

.close-btn:hover {
    color: white;
}

.helper-text {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Loading Overlay */
.overlay {
    display: none;
    position: fixed;
    z-index: 200;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(6px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

.overlay.show {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

@media (max-width: 600px) {
    .action-row {
        flex-direction: column;
        gap: 1rem;
    }
    .action-row button {
        width: 100%;
        justify-content: center;
    }
}