/* ========================================
   Base Styles - すごいAI道場
   全ページ共通の基本スタイル
   ======================================== */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    background: #fcfcfc;
    color: #000814;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 0 40px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-top: 70px; /* Fixed nav heightを考慮 */
}

header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: 2px;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.95;
    letter-spacing: 1px;
}

/* Main Content */
main {
    padding: 40px 20px;
}

/* Category Sections (index page) */
.category-section {
    margin-bottom: 80px;
    padding: 40px;
    background: white;
    border: 3px solid #e0e0e0;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.section-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
    color: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

.section-header h2 {
    font-size: 2rem;
    color: #000814;
}

.section-description {
    font-size: 1.1rem;
    color: #625147;
    margin-bottom: 30px;
    padding-left: 80px;
}

/* Lesson Grid (index page) */
.lesson-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

/* Lesson Cards (index page) */
.lesson-card {
    background: white;
    border: 3px solid #625147;
    padding: 10%;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.lesson-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
    border-color: #f46434;
}

.lesson-number {
    position: absolute;
    top: 15px;
    right: 15px;
    background: #f46434;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
}

.lesson-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: #000814;
    line-height: 1.3;
}

.lesson-card p {
    color: #625147;
    margin-bottom: 20px;
    flex-grow: 1;
}

.lesson-link {
    display: inline-block;
    background: #f46434;
    color: white;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    transition: all 0.3s ease;
    text-align: center;
}

.lesson-link:hover {
    background: #d84a1b;
    transform: scale(1.05);
}

/* Category-specific colors (index page) */
#ai-general .lesson-card:hover {
    border-color: #f46434;
}

#ai-general .lesson-number {
    background: #f46434;
}

#ai-general .lesson-link {
    background: #f46434;
}

#ai-general .lesson-link:hover {
    background: #d84a1b;
}

#startup .lesson-card:hover {
    border-color: #4a90e2;
}

#startup .lesson-number {
    background: #4a90e2;
}

#startup .lesson-link {
    background: #4a90e2;
}

#startup .lesson-link:hover {
    background: #357abd;
}

#creative .lesson-card:hover {
    border-color: #27ae60;
}

#creative .lesson-number {
    background: #27ae60;
}

#creative .lesson-link {
    background: #27ae60;
}

#creative .lesson-link:hover {
    background: #1e8449;
}

#community .lesson-card:hover {
    border-color: #9b59b6;
}

#community .lesson-number {
    background: #9b59b6;
}

#community .lesson-link {
    background: #9b59b6;
}

#community .lesson-link:hover {
    background: #7d3c98;
}

/* Badges Section (mypage) */
.badges-section {
    margin: 60px 0;
    padding: 40px;
    background: white;
    border: 3px solid #625147;
    border-radius: 8px;
}

.badges-section h2 {
    font-size: 2rem;
    margin-bottom: 10px;
    text-align: center;
    color: #000814;
}

.badges-section .section-description {
    text-align: center;
    padding-left: 0;
    margin-bottom: 30px;
    color: #625147;
}

.badges-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    min-height: 100px;
    margin-bottom: 30px;
}

.badge-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px;
    background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
    border: 2px solid #d0d0d0;
    border-radius: 12px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.badge-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    border-color: #f46434;
}

.badge-icon-small {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.badge-name {
    font-weight: 600;
    color: #000814;
    font-size: 1.1rem;
}

.badge-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    padding: 20px;
    background: #f8f8f8;
    border-radius: 8px;
    border: 2px solid #e0e0e0;
}

.badge-stats span {
    font-size: 1.1rem;
    color: #625147;
}

.badge-stats strong {
    color: #f46434;
    font-size: 1.2rem;
}

.badges-container:empty::before {
    content: 'まだバッジを獲得していません。レッスンを完了してバッジを集めましょう！';
    display: block;
    text-align: center;
    padding: 40px;
    color: #999;
    font-style: italic;
    grid-column: 1 / -1;
}

/* Progress Section (mypage) */
.progress-section {
    margin: 60px 0;
    padding: 40px;
    background: white;
    border: 3px solid #625147;
    border-radius: 8px;
}

.progress-section h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    text-align: center;
    color: #000814;
}

.progress-container {
    display: grid;
    gap: 25px;
}

.progress-item {
    display: grid;
    grid-template-columns: 120px 1fr 80px;
    align-items: center;
    gap: 20px;
}

.progress-item span:first-child {
    font-weight: 600;
    color: #000814;
}

.progress-bar {
    background: #e0e0e0;
    border-radius: 10px;
    height: 24px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #f46434 0%, #ff8c66 100%);
    border-radius: 10px;
    transition: width 0.5s ease;
    width: 0%;
}

.progress-text {
    text-align: right;
    font-weight: bold;
    color: #625147;
}

/* Footer */
footer {
    background: #000814;
    color: white;
    text-align: center;
    padding: 40px 20px;
    margin-top: 60px;
}

footer p {
    margin: 10px 0;
    opacity: 0.9;
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
    overflow-y: scroll;
}

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

.category-section {
    animation: fadeIn 0.6s ease-out;
}

/* Accessibility */
.lesson-link:focus,
.main-nav a:focus {
    outline: none;
}

/* Print Styles */
@media print {
    .main-nav,
    footer {
        display: none;
    }

    .lesson-card {
        page-break-inside: avoid;
    }
}

/* ========================================
   Responsive Design - Base
   ======================================== */

/* Tablet (768px - 1024px) */
@media (max-width: 1024px) {
    header {
        margin-top: 70px;
    }

    header h1 {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .lesson-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .category-section {
        padding: 30px;
    }
}

/* Mobile and Small Tablet (max-width: 768px) */
@media (max-width: 768px) {
    header {
        padding: 40px 0 30px;
        margin-top: 60px;
    }

    header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    main {
        padding: 20px 15px;
    }

    .category-section {
        padding: 20px;
        margin-bottom: 40px;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .section-icon {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }

    .section-header h2 {
        font-size: 1.6rem;
    }

    .section-description {
        padding-left: 0;
        font-size: 1rem;
    }

    .lesson-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .lesson-card {
        min-height: 180px;
    }

    .lesson-card h3 {
        font-size: 1.3rem;
    }

    .badges-section {
        padding: 25px 20px;
    }

    .badges-section h2 {
        font-size: 1.6rem;
    }

    .badges-container {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .badge-stats {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .progress-section {
        padding: 25px 20px;
    }

    .progress-section h2 {
        font-size: 1.6rem;
    }

    .progress-item {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .progress-text {
        text-align: left;
    }

    footer {
        padding: 30px 20px;
    }

    footer p {
        font-size: 0.9rem;
    }
}

/* Small Mobile (max-width: 480px) */
@media (max-width: 480px) {
    header {
        padding: 30px 0 25px;
        margin-top: 55px;
    }

    header h1 {
        font-size: 1.8rem;
        letter-spacing: 1px;
    }

    .subtitle {
        font-size: 0.95rem;
    }

    main {
        padding: 15px 10px;
    }

    .category-section {
        padding: 15px;
        margin-bottom: 30px;
    }

    .section-header h2 {
        font-size: 1.4rem;
    }

    .section-icon {
        width: 45px;
        height: 45px;
        font-size: 1.3rem;
    }

    .lesson-card {
        padding: 6%;
        min-height: 160px;
    }

    .lesson-card h3 {
        font-size: 1.2rem;
    }

    .lesson-card p {
        font-size: 0.95rem;
    }

    .lesson-number {
        width: 35px;
        height: 35px;
        font-size: 0.85rem;
    }

    .lesson-link {
        padding: 10px 20px;
        font-size: 0.95rem;
    }

    .badges-section h2,
    .progress-section h2 {
        font-size: 1.4rem;
    }

    .badge-stats span {
        font-size: 1rem;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .lesson-card:hover {
        transform: none;
    }

    .lesson-card:active {
        transform: scale(0.98);
    }

    .lesson-link:hover {
        transform: none;
    }

    .lesson-link:active {
        transform: scale(0.95);
    }
}

/* Landscape Mobile */
@media (max-height: 500px) and (orientation: landscape) {
    header {
        padding: 20px 0 15px;
        margin-top: 50px;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .lesson-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}