/* ===== CSS Variables & Theme ===== */
:root {
    --primary: #2563EB;
    --primary-hover: #1D4ED8;
    --primary-light: #DBEAFE;
    --bg: #F8FAFC;
    --surface: #FFFFFF;
    --surface-hover: #F1F5F9;
    --text: #1E293B;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --border-focus: #2563EB;
    --error: #EF4444;
    --error-bg: #FEF2F2;
    --success: #22C55E;
    --success-bg: #F0FDF4;
    --warning: #F59E0B;
    --warning-bg: #FFFBEB;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --transition: 0.2s ease;
    --font: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

[data-theme="dark"] {
    --primary: #3B82F6;
    --primary-hover: #60A5FA;
    --primary-light: #1E3A5F;
    --bg: #0F172A;
    --surface: #1E293B;
    --surface-hover: #334155;
    --text: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --border: #334155;
    --border-focus: #3B82F6;
    --error: #F87171;
    --error-bg: #451A1A;
    --success: #4ADE80;
    --success-bg: #14532D;
    --warning: #FBBF24;
    --warning-bg: #451A03;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5), 0 4px 6px -4px rgba(0,0,0,0.4);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    transition: background var(--transition), color var(--transition);
}

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: background var(--transition), border-color var(--transition);
}

.header-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 0.875rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
}

.logo svg {
    color: var(--primary);
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.theme-toggle:hover {
    background: var(--surface-hover);
    color: var(--primary);
    border-color: var(--primary);
}

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
:root .icon-sun,
html:not([data-theme="dark"]) .icon-sun { display: none; }
:root .icon-moon,
html:not([data-theme="dark"]) .icon-moon { display: block; }

/* ===== Main Container ===== */
.main-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 1.5rem 1.25rem 2rem;
}

/* ===== Tab Navigation ===== */
.tab-nav {
    display: flex;
    gap: 0;
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 0.375rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition);
    white-space: nowrap;
    min-width: 0;
}

.tab-btn:hover {
    color: var(--text);
    background: var(--surface-hover);
}

.tab-btn.active {
    background: var(--primary);
    color: #FFFFFF;
    box-shadow: var(--shadow-md);
}

.tab-btn.active svg {
    stroke: #FFFFFF;
}

/* ===== Tab Content ===== */
.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Card ===== */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: background var(--transition), border-color var(--transition);
}

.card-header {
    padding: 1.5rem 1.5rem 0.5rem;
}

.card-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.card-desc {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ===== Form Sections ===== */
.form-section {
    border: none;
    padding: 1rem 1.5rem;
    margin: 0;
}

.form-section legend {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding-bottom: 0.75rem;
    margin-bottom: 0;
    display: block;
    width: 100%;
    border-bottom: 1px solid var(--border);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text);
}

.required {
    color: var(--error);
}

/* ===== Inputs ===== */
input[type="text"],
input[type="tel"],
input[type="email"],
input[type="password"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-family: var(--font);
    font-size: 0.9rem;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: all var(--transition);
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

input.input-readonly {
    background: var(--surface-hover);
    cursor: not-allowed;
    opacity: 0.7;
}

input.input-error,
select.input-error,
textarea.input-error {
    border-color: var(--error);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

select:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.error-msg {
    font-size: 0.78rem;
    color: var(--error);
    min-height: 0;
    transition: all var(--transition);
}

.error-msg:empty {
    display: none;
}

/* ===== Password Wrapper ===== */
.password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-wrapper input {
    padding-right: 2.75rem;
}

.password-toggle {
    position: absolute;
    right: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: color var(--transition);
}

.password-toggle:hover {
    color: var(--text);
}

.password-toggle .eye-closed { display: none; }
.password-toggle.active .eye-open { display: none; }
.password-toggle.active .eye-closed { display: block; }

/* ===== Captcha ===== */
.captcha-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.captcha-display {
    flex: 1;
    padding: 0.625rem 1rem;
    background: linear-gradient(135deg, var(--surface-hover), var(--bg));
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 0.4em;
    text-align: center;
    color: var(--primary);
    user-select: none;
    font-family: 'Courier New', monospace;
    position: relative;
    overflow: hidden;
}

.captcha-display::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--text-muted);
    opacity: 0.3;
    transform: rotate(-5deg);
}

.captcha-display::after {
    content: '';
    position: absolute;
    top: 30%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--text-muted);
    opacity: 0.2;
    transform: rotate(3deg);
}

.captcha-refresh {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
}

.captcha-refresh:hover {
    background: var(--surface-hover);
    color: var(--primary);
    border-color: var(--primary);
}

/* ===== File Upload ===== */
.file-upload-group {
    margin-top: 1rem;
}

.file-upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    overflow: hidden;    
}

.file-upload-area:hover,
.file-upload-area.dragover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3px;
    gap: 0.5rem;
    color: var(--text-secondary);
}

.upload-placeholder svg {
    color: var(--text-muted);
}

.upload-placeholder p {
    font-size: 0.9rem;
    font-weight: 500;
}

.upload-hint {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.file-preview-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 0.75rem;
}

.file-preview-item {
    position: relative;
    width: 100px;
    height: 100px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--surface-hover);
}

.file-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.file-preview-item .file-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-align: center;
    padding: 0.5rem;
    word-break: break-all;
}

.file-remove-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: none;
    background: rgba(239, 68, 68, 0.9);
    color: #fff;
    font-size: 0.75rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    transition: background var(--transition);
}

.file-remove-btn:hover {
    background: rgba(220, 38, 38, 1);
}

/* ===== Checkbox ===== */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text);
    margin-top: 0.5rem;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
    cursor: pointer;
}

/* ===== Buttons ===== */
.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.5rem;
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary {
    background: var(--primary);
    color: #FFFFFF;
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--surface-hover);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
    color: var(--text);
}

/* ===== Notice Box (inline) ===== */
.notice-box {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    border-radius: var(--radius-sm);
    margin-top: 0.75rem;
    font-size: 0.85rem;
    line-height: 1.5;
}

.notice-box.warning {
    background: var(--warning-bg);
    color: var(--warning);
    border: 1px solid var(--warning);
}

.notice-box.warning svg {
    flex-shrink: 0;
    margin-top: 1px;
}

/* ===== Notice Section ===== */
.notice-section {
    margin-top: 2rem;
}

.notice-list {
    padding: 0 1.5rem 1.5rem;
}

.notice-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
}

.notice-item:last-child {
    border-bottom: none;
}

.notice-badge {
    flex-shrink: 0;
    padding: 0.2rem 0.6rem;
    font-size: 0.72rem;
    font-weight: 700;
    border-radius: 999px;
    background: var(--primary-light);
    color: var(--primary);
    white-space: nowrap;
}

.notice-badge.important {
    background: var(--error-bg);
    color: var(--error);
}

.notice-content h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.notice-content p {
    font-size: 0.83rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.notice-date {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.375rem;
    display: inline-block;
}

.notice-detail-content {
  width: 90%;
  height: 90%;
  margin: 0 auto; /* 가운데 정렬 */
}

/* 모바일 화면 (너비가 768px 이하일 때 적용) */
@media (max-width: 768px) {
  .notice-detail-content {
    width: 100%;
    height: 100%;
  }
}

/* ===== Lookup Result ===== */
.lookup-result {
    padding: 0 1.5rem 1.5rem;
}

.lookup-result.hidden {
    display: none;
}

/* ===== AS Lookup Result Table ===== */
.as-result-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-top: 1rem;
}

.as-result-card h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.result-row {
    display: flex;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
}

.result-row:last-child {
    border-bottom: none;
}

.result-label {
    flex: 0 0 120px;
    font-weight: 600;
    color: var(--text-secondary);
}

.result-value {
    flex: 1;
    color: var(--text);
}

.status-badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-badge.pending {
    background: var(--warning-bg);
    color: var(--warning);
}

.status-badge.in-progress {
    background: var(--primary-light);
    color: var(--primary);
}

.status-badge.completed {
    background: var(--success-bg);
    color: var(--success);
}

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
    animation: fadeIn 0.2s ease;
}

.modal-overlay.hidden {
    display: none;
}

.modal {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 800px;
    max-width: 1280px;
    overflow: hidden;
    animation: slideUp 0.3s ease;
}
/* 모바일 화면 (너비가 768px 이하일 때 적용) */
@media (max-width: 768px) {
  .modal {
    width: 100%;
  }
}

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

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem 0.75rem;
}

.modal-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.modal-close:hover {
    background: var(--surface-hover);
    color: var(--text);
}

.modal-body {
    padding: 0.5rem 1.5rem 1.25rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    padding: 0 1.5rem 1.25rem;
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
    margin-top: 2rem;
}

/* ===== Hidden Utility ===== */
.hidden {
    display: none !important;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .header-inner {
        padding: 0.75rem 1rem;
    }

    .logo span {
        font-size: 0.95rem;
    }

    .main-container {
        padding: 1rem 0.75rem 1.5rem;
    }

    .tab-nav {
        border-radius: var(--radius-md);
        padding: 0.25rem;
    }

    .tab-btn {
        padding: 0.625rem 0.5rem;
        font-size: 0.8rem;
        gap: 0.35rem;
    }

    .tab-btn svg {
        width: 16px;
        height: 16px;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .card-header {
        padding: 1.25rem 1rem 0.5rem;
    }

    .form-section {
        padding: 1rem;
    }

    .form-actions {
        padding: 1rem;
        flex-direction: column-reverse;
    }

    .form-actions .btn {
        width: 100%;
    }

    .notice-item {
        flex-direction: column;
        gap: 0.5rem;
    }

    .result-row {
        flex-direction: column;
        gap: 0.25rem;
    }

    .result-label {
        flex: none;
    }

    .captcha-wrapper {
        flex-wrap: nowrap;
    }

    .captcha-display {
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .tab-btn span {
        display: none;
    }

    .tab-btn {
        justify-content: center;
        padding: 0.75rem;
    }

    .tab-btn svg {
        width: 20px;
        height: 20px;
    }

    .file-preview-item {
        width: 80px;
        height: 80px;
    }
}