/* 학생 시간표 생성기 - 메인 스타일시트 */

/* ===== 디자인 시스템 변수 ===== */
:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #eff6ff;
    --color-success: #16a34a;
    --color-success-light: #f0fdf4;
    --color-warning: #ea580c;
    --color-warning-light: #fff7ed;
    --color-danger: #dc2626;
    --color-danger-light: #fef2f2;
    --color-purple: #7c3aed;
    --color-purple-dark: #6d28d9;

    --color-text: #1e293b;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-bg: #f8fafc;
    --color-bg-card: #ffffff;

    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;

    --font-xs: 11px;
    --font-sm: 12px;
    --font-base: 14px;
    --font-md: 16px;
    --font-lg: 18px;
    --font-xl: 22px;

    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

/* ===== 기본 스타일 ===== */
body {
    font-family: 'Noto Sans KR', sans-serif;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    background-color: var(--color-bg);
    color: var(--color-text);
}

#app-container {
    width: 100%;
    max-width: 800px;
    background-color: var(--color-bg-card);
    padding: 40px;
    border-radius: var(--radius-xl);
    box-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    border: 1px solid var(--color-border);
    text-align: center;
}

h1, h2 {
    color: var(--color-text);
}

h2 {
    font-size: var(--font-lg);
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border-light);
    padding-bottom: var(--space-md);
    margin-top: 40px;
}

/* ===== 헤더 영역 ===== */
.app-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.app-header h1 {
    margin-bottom: var(--space-sm);
    font-size: var(--font-xl);
}

.help-link-wrapper {
    margin-bottom: var(--space-md);
}

.help-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--color-primary);
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: var(--font-base);
    font-weight: 500;
    transition: background 0.2s;
}

.help-link:hover {
    background: var(--color-primary-dark);
}

.help-link svg {
    flex-shrink: 0;
}

.app-credit {
    font-size: var(--font-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-xs);
}

.app-version {
    font-size: var(--font-xs);
    color: var(--color-text-muted);
}

/* ===== 스텝 인디케이터 ===== */
.step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-xl);
    gap: 0;
}

.step-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    opacity: 0.4;
    transition: opacity 0.3s;
}

.step-item.active,
.step-item.completed {
    opacity: 1;
}

.step-number {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-border);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: var(--font-base);
    transition: all 0.3s;
}

.step-item.active .step-number {
    background: var(--color-primary);
    color: white;
}

.step-item.completed .step-number {
    background: var(--color-success);
    color: white;
}

.step-label {
    font-size: var(--font-sm);
    color: var(--color-text-muted);
    font-weight: 500;
}

.step-item.active .step-label {
    color: var(--color-primary);
    font-weight: 600;
}

.step-item.completed .step-label {
    color: var(--color-success);
}

.step-connector {
    width: 60px;
    height: 2px;
    background: var(--color-border);
    margin: 0 var(--space-sm);
    margin-bottom: 20px;
    transition: background 0.3s;
}

.step-connector.completed {
    background: var(--color-success);
}

/* ===== 업로드 박스 스타일 ===== */
.upload-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.upload-box {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    background-color: var(--color-bg);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 120px;
}

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

.upload-box.uploaded {
    border-color: var(--color-success);
    background-color: var(--color-success-light);
    border-style: solid;
}

.upload-box p {
    margin: 0;
    font-size: var(--font-md);
    color: var(--color-text-secondary);
    font-weight: 600;
}

.upload-box .file-name {
    font-size: var(--font-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-sm);
    word-break: break-all;
    padding: 0 10px;
}

.file-input {
    display: none;
}

/* ===== 아이콘 업로드/미리보기 ===== */
#upload-box-icon {
    margin-top: 20px;
}

#icon-preview-container {
    display: none;
    margin-bottom: var(--space-md);
}

#icon-preview {
    max-width: 100px;
    max-height: 100px;
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

#icon-preview-container p {
    margin: var(--space-sm) 0 0 0;
    font-size: var(--font-sm);
    color: var(--color-text-muted);
}

/* ===== 2단계 스타일 ===== */
#step2 {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 30px;
    margin: 30px 0;
    text-align: left;
    animation: fadeInUp 0.4s ease-out;
}

.step2-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.step2-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--space-md);
    color: var(--color-text-secondary);
}

.step2-icon svg {
    width: 28px;
    height: 28px;
}

.step2-title {
    font-size: var(--font-lg);
    color: var(--color-text);
    margin: 0;
    font-weight: 600;
}

.optional-badge {
    background: var(--color-text-muted);
    color: white;
    font-size: var(--font-xs);
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    margin-left: var(--space-sm);
    font-weight: 500;
}

.step2-description {
    background: var(--color-bg-card);
    padding: 20px;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    border-left: 3px solid var(--color-primary);
}

.step2-description h4 {
    margin: 0 0 10px 0;
    color: var(--color-text);
    font-size: var(--font-base);
}

.step2-description p {
    margin: var(--space-sm) 0;
    color: var(--color-text-secondary);
    line-height: 1.6;
    font-size: var(--font-base);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin: 20px 0;
}

.process-step {
    background: var(--color-bg-card);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid var(--color-border);
    transition: all 0.2s;
}

.process-step:hover {
    border-color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.process-step-number {
    background: var(--color-primary);
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
    font-weight: 600;
    font-size: var(--font-base);
}

.process-step-title {
    font-weight: 600;
    color: var(--color-text);
    font-size: var(--font-sm);
    margin-bottom: var(--space-xs);
}

.process-step-desc {
    font-size: var(--font-xs);
    color: var(--color-text-muted);
    line-height: 1.4;
}

.upload-section {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 2px dashed var(--color-border);
    text-align: center;
    transition: all 0.2s;
    cursor: pointer;
}

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

.upload-section.uploaded {
    border-color: var(--color-success);
    background-color: var(--color-success-light);
    border-style: solid;
}

.upload-icon {
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    transition: color 0.2s;
}

.upload-icon svg {
    width: 36px;
    height: 36px;
}

.upload-section:hover .upload-icon {
    color: var(--color-primary);
}

.uploaded .upload-icon {
    color: var(--color-success);
}

.upload-title {
    font-size: var(--font-md);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.upload-subtitle {
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    font-size: var(--font-base);
}

.file-status {
    background: var(--color-bg);
    padding: 6px 14px;
    border-radius: 20px;
    display: inline-block;
    font-size: var(--font-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.uploaded .file-status {
    background: var(--color-success-light);
    color: var(--color-success);
}

.template-actions {
    margin-top: 20px;
    text-align: center;
}

.skip-section {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-top: 20px;
    text-align: center;
}

.skip-section h4 {
    margin: 0 0 var(--space-sm) 0;
    color: var(--color-text-secondary);
    font-size: var(--font-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.skip-section h4 svg {
    width: 16px;
    height: 16px;
}

.skip-section p {
    margin: 0;
    color: var(--color-text-muted);
    font-size: var(--font-sm);
}

/* ===== 기능 선택 스타일 ===== */
#features-selection-container {
    margin: var(--space-lg) 0;
    text-align: left;
}

.section-label {
    font-weight: 600;
    margin-bottom: var(--space-md);
    display: block;
    color: var(--color-text);
    font-size: var(--font-base);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-bottom: 20px;
}

.feature-option label {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: none;
}

.feature-option label:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.feature-option label:has(input:checked) {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

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

.feature-option .feature-icon {
    display: flex;
    align-items: center;
    color: var(--color-text-muted);
}

.feature-option .feature-icon svg {
    width: 20px;
    height: 20px;
}

.feature-option label:has(input:checked) .feature-icon {
    color: var(--color-primary);
}

.feature-title {
    font-weight: 600;
    color: var(--color-text);
    font-size: var(--font-base);
}

.feature-desc {
    font-size: var(--font-sm);
    color: var(--color-text-muted);
}

.feature-option input:checked + .feature-icon + div .feature-title,
.feature-option input:checked ~ div .feature-title {
    color: var(--color-primary);
}

.feature-option input:not(:checked) + .feature-icon + div,
.feature-option input:not(:checked) ~ div {
    opacity: 0.5;
}

/* ===== 버튼 스타일 ===== */
button {
    width: 100%;
    padding: 14px;
    border: none;
    color: white;
    border-radius: var(--radius-md);
    font-size: var(--font-md);
    font-weight: 600;
    transition: all 0.2s;
    margin-top: var(--space-md);
    cursor: pointer;
    position: relative;
}

button:disabled {
    background: var(--color-text-muted);
    cursor: not-allowed;
    opacity: 0.5;
}

button:disabled[data-disabled-reason]::after {
    content: attr(data-disabled-reason);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-text);
    color: white;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: var(--font-sm);
    font-weight: 400;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
    z-index: 10;
}

button:disabled[data-disabled-reason]:hover::after {
    opacity: 1;
}

#template-gen-button {
    background: var(--color-primary);
}

#template-gen-button:not(:disabled):hover {
    background: var(--color-primary-dark);
}

#generate-button {
    background: var(--color-success);
}

#generate-button:not(:disabled):hover {
    background: #15803d;
}

#redownload-template-button {
    background: var(--color-purple);
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-base);
    cursor: pointer;
    transition: all 0.2s;
    width: auto;
}

#redownload-template-button:not(:disabled):hover {
    background: var(--color-purple-dark);
}

button:not(:disabled):hover {
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}

/* ===== 상태 메시지 ===== */
#status {
    margin-top: 20px;
    font-size: var(--font-base);
    color: var(--color-text-secondary);
    min-height: 20px;
    padding: var(--space-md);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    border-left: 3px solid var(--color-border);
    text-align: left;
    transition: all 0.3s;
}

#status.status-success {
    background: var(--color-success-light);
    border-left-color: var(--color-success);
    color: #166534;
}

#status.status-error {
    background: var(--color-danger-light);
    border-left-color: var(--color-danger);
    color: #991b1b;
}

#status.status-progress {
    background: var(--color-primary-light);
    border-left-color: var(--color-primary);
    color: #1e40af;
}

/* ===== 제목 입력 ===== */
#timetable-title-container {
    margin: 30px 0;
    text-align: left;
}

#timetable-title-container label {
    font-weight: 600;
    margin-bottom: 10px;
    display: block;
    color: var(--color-text);
    font-size: var(--font-base);
}

#timetable-title {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: var(--font-md);
    box-sizing: border-box;
    transition: border-color 0.2s;
}

#timetable-title:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ===== 테마 선택 스타일 ===== */
#theme-selection-container {
    margin: 30px 0;
    text-align: left;
}

.theme-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 16px 12px;
    margin-bottom: 20px;
    justify-content: center;
}

.theme-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    padding: 8px;
    border-radius: 14px;
    border: 2px solid transparent;
    transition: all 0.2s ease;
    background: transparent;
    width: 72px;
}

.theme-option:hover {
    background: var(--color-bg);
}

.theme-option:hover .theme-preview {
    transform: scale(1.1);
    box-shadow: 0 4px 14px rgba(0,0,0,0.15);
}

.theme-option.selected {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.theme-option.selected .theme-preview {
    box-shadow: 0 2px 10px rgba(0,0,0,0.12);
}

.theme-name {
    font-size: 11px;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-top: 6px;
    letter-spacing: -0.01em;
}

.theme-option.selected .theme-name {
    color: var(--color-primary);
    font-weight: 600;
}

.theme-preview {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

/* ===== 토스트 알림 ===== */
#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    padding: 14px 20px;
    border-radius: var(--radius-md);
    color: white;
    font-size: var(--font-base);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    animation: slideIn 0.3s ease-out;
    max-width: 400px;
}

.toast.error { background: var(--color-danger); }
.toast.success { background: var(--color-success); }
.toast.warning { background: var(--color-warning); }
.toast.info { background: var(--color-primary); }

/* ===== 로딩 오버레이 ===== */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255,255,255,0.85);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    gap: var(--space-md);
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

.loading-text {
    font-size: var(--font-base);
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* ===== 애니메이션 ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

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

/* ===== 모바일 반응형 스타일 ===== */
@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .feature-option label {
        padding: 12px;
        font-size: var(--font-base);
    }

    .theme-grid {
        gap: 10px 8px;
    }

    .theme-option {
        width: 60px;
        padding: 6px;
    }

    .theme-preview {
        width: 36px;
        height: 36px;
    }

    .theme-name {
        font-size: 10px;
    }

    body {
        padding: 10px;
    }

    #app-container {
        max-width: 100%;
        padding: 20px;
    }

    .upload-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .process-steps {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    h1 {
        font-size: 1.3em;
        margin-bottom: 20px;
    }

    button {
        font-size: var(--font-base);
        padding: 12px;
    }

    #timetable-title {
        font-size: var(--font-base);
        padding: 10px;
    }

    .step-indicator {
        gap: 0;
    }

    .step-connector {
        width: 30px;
    }

    .step-label {
        font-size: var(--font-xs);
    }

    #toast-container {
        left: 10px;
        right: 10px;
    }

    .toast {
        max-width: 100%;
    }
}