:root {
    /* 다크 모드 (기본값) */
    --bg-color: #0d1117;
    --container-bg: #161b22;
    --border-color: #30363d;
    --text-main: #c9d1d9;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --btn-bg: #21262d;
    --btn-hover: #30363d;
    --input-bg: #0d1117;
    --card-shadow: rgba(0,0,0,0.4);
}

[data-theme='light'] {
    /* 라이트 모드 */
    --bg-color: #f6f8fa;
    --container-bg: #ffffff;
    --border-color: #d0d7de;
    --text-main: #24292f;
    --text-secondary: #57606a;
    --accent-color: #0969da;
    --btn-bg: #f3f4f6;
    --btn-hover: #ebedef;
    --input-bg: #ffffff;
    --card-shadow: rgba(0,0,0,0.1);
}

/* 기본 초기화 및 폰트 설정 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
    transition: background-color 0.3s, color 0.3s;
}

/* 메인 컨테이너 */
.container {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

#themeBtn {
    background: var(--btn-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0;
    border-radius: 6px;
    width: 46px;
    height: 46px;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    margin-left: 0.2rem;
}

#themeBtn:hover {
    background: var(--btn-hover);
    transform: scale(1.1);
}

/* 헤더 및 검색창 영역 */
.search-header {
    background: var(--container-bg);
    padding: 2.5rem 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 24px var(--card-shadow);
    text-align: center;
}

.search-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--accent-color);
}

.search-header p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.search-box {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.search-box input {
    flex: 1;
    max-width: 400px;
    padding: 0.8rem 1.2rem;
    font-size: 1rem;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-main);
    transition: border-color 0.2s;
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.search-box button {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    background-color: #238636;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.search-box button:hover { background-color: #2ea043; }
.search-box button:active { transform: scale(0.98); }

/* 경고창 */
.alert {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 6px;
    font-weight: 500;
    text-align: center;
}
.alert.error {
    background-color: rgba(248, 81, 73, 0.1);
    color: #f85149;
    border: 1px solid rgba(248, 81, 73, 0.4);
}

/* 추천 개발자 섹션 */
.recommended-section {
    margin-top: -1rem;
    transition: all 0.3s ease;
}

#recommendedTitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    padding-left: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    user-select: none;
}

#toggleIcon {
    font-size: 0.7rem;
    margin-left: 0.6rem;
    color: var(--accent-color);
}

.recommended-wrapper {
    overflow: hidden;
    width: 100%;
}

.recommended-devs {
    display: flex;
    padding: 0.5rem;
}

.dev-card {
    background: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 6px var(--card-shadow);
    position: relative;
    overflow: hidden;
}

.dev-card:hover {
    border-color: var(--accent-color);
    background: var(--btn-bg);
    z-index: 10;
}

.rank-bg {
    position: absolute;
    right: 5px;
    bottom: -15px;
    font-size: 6rem;
    font-weight: 900;
    color: var(--text-main);
    opacity: 0.1;
    pointer-events: none;
    user-select: none;
    z-index: 0;
    transition: color 0.3s ease;
}

.dev-card:hover .rank-bg { color: var(--accent-color); opacity: 0.2; }

/* [확장 상태] */
.recommended-section.expanded .recommended-devs {
    gap: 1rem;
    width: max-content;
    animation: ticker 60s linear infinite;
}
.recommended-section.expanded .recommended-devs:hover { animation-play-state: paused; }

.recommended-section.expanded .dev-card {
    flex: 0 0 220px;
    flex-direction: column;
    padding: 1.5rem 1rem;
    text-align: center;
}
.recommended-section.expanded .dev-card img {
    width: 60px; height: 60px;
    border-radius: 50%;
    margin-bottom: 0.8rem;
    border: 2px solid var(--border-color);
    z-index: 1;
}
.recommended-section.expanded .dev-card .dev-name { color: var(--accent-color); font-weight: 700; z-index: 1; }
.recommended-section.expanded .dev-card .dev-login { color: var(--text-secondary); font-size: 0.8rem; z-index: 1; }
.recommended-section.expanded .dev-card .dev-desc { color: var(--text-main); font-size: 0.75rem; z-index: 1; }

/* [축소 상태] */
.recommended-section.collapsed .recommended-devs {
    gap: 3rem;
    width: max-content;
    animation: ticker 40s linear infinite;
}
.recommended-section.collapsed .dev-card {
    flex: 0 0 auto;
    background: transparent;
    border: none;
    box-shadow: none;
}
.recommended-section.collapsed .dev-card .rank-bg {
    display: block; position: static;
    font-size: 0.9rem; color: var(--accent-color);
    margin-right: 0.5rem; opacity: 1;
}
.recommended-section.collapsed .dev-card img { width: 24px; height: 24px; border-radius: 50%; margin-right: 0.5rem; }
.recommended-section.collapsed .dev-card .dev-name { color: var(--text-main); font-size: 0.9rem; }
.recommended-section.collapsed .dev-card .dev-login, 
.recommended-section.collapsed .dev-card .dev-desc { display: none; }

@keyframes ticker {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* 프로필 카드 */
.profile-card {
    background: var(--container-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    gap: 2rem;
    box-shadow: 0 4px 12px var(--card-shadow);
    animation: fadeIn 0.5s ease;
}
.profile-avatar { width: 150px; height: 150px; border-radius: 50%; border: 4px solid var(--border-color); }
.profile-info h2 { font-size: 1.8rem; color: var(--text-main); margin-bottom: 0.2rem; }
.profile-info .username { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 1rem; display: block; }
.profile-info .bio { margin-bottom: 1.5rem; font-size: 1rem; }
.profile-stats {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}
.stat-badge {
    background: var(--btn-bg);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--accent-color);
    border: 1px solid var(--border-color);
}
.view-profile-btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    background-color: var(--btn-bg);
    color: var(--text-main);
    text-decoration: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-weight: 600;
}
.view-profile-btn:hover { background-color: var(--btn-hover); border-color: var(--text-secondary); }

/* 저장소 목록 */
.repos-container h2 { border-bottom: 1px solid var(--border-color); margin-bottom: 1rem; padding-bottom: 0.5rem; }
.repo-item {
    background: var(--container-bg);
    padding: 1.2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}
.repo-item:hover { border-color: var(--accent-color); box-shadow: 0 4px 12px var(--card-shadow); }
.repo-item a.repo-name { color: var(--accent-color); text-decoration: none; font-weight: 700; font-size: 1.2rem; margin-bottom: 0.4rem; display: block; }
.repo-item a.repo-name:hover { text-decoration: underline; }
.repo-info { flex: 1; padding-right: 1rem; }
.repo-description { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.repo-stats { display: flex; flex-direction: column; gap: 0.3rem; }
.repo-stat-badge {
    background: var(--btn-bg);
    padding: 0.4rem;
    width: 85px;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    display: flex; justify-content: center; gap: 0.4rem;
}

/* 차트 */
.chart-container {
    background: var(--container-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 24px var(--card-shadow);
}
.canvas-wrapper { position: relative; height: 300px; width: 100%; }

.hidden { display: none !important; }

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

@media (max-width: 600px) {
    .profile-card { flex-direction: column; align-items: center; text-align: center; }
}