/* Google Fonts import */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap');

:root {
    /* Material Design Color Palette (approximate) */
    --md-blue-500: #4285F4; /* Primary Blue */
    --md-blue-700: #1a73e8; /* Darker Blue */
    --md-grey-100: #f1f3f4; /* Light Grey Background */
    --md-grey-300: #dadce0; /* Border Color */
    --md-grey-800: #3c4043; /* Primary Text */
    --md-grey-600: #5f6368; /* Secondary Text / Icons */
    --md-red-600: #d93025;  /* Error/Danger Red */
    --md-red-700: #c5221f;  /* Darker Red */
    --md-white: #ffffff;
    --md-grey-200: #e8eaed; /* Lighter border/background */

    /* Theme Variables */
    --primary-color: var(--md-blue-500);
    --primary-dark-color: var(--md-blue-700);
    --background-color: var(--md-grey-100);
    --surface-color: var(--md-white);
    --on-surface-color: var(--md-grey-800);
    --border-color: var(--md-grey-300);
    --danger-color: var(--md-red-600);
    --danger-dark-color: var(--md-red-700);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif; /* Roboto 적용 */
}

body {
    background-color: var(--background-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1000px;
    width: 100%;
    background-color: var(--surface-color);
    border-radius: 8px; /* Material Design Standard */
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24); /* Material Elevation 1 */
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.setup-panel {
    padding: 32px;
    text-align: center;
    background-color: var(--surface-color);
    position: relative; /* 아이콘 버튼 위치 기준 */
}

h1 {
    color: var(--primary-color);
    margin-bottom: 24px;
    font-size: 24px; /* Material Typography */
    font-weight: 500;
}

h2 {
    color: var(--on-surface-color);
    margin-bottom: 24px;
    font-size: 18px;
    font-weight: 500;
}

.input-group {
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px; /* 간격 복원 */
}

label {
    font-weight: 500;
    font-size: 14px;
    color: var(--md-grey-600);
}

/* 이전 input[type="number"] 스타일 복원 */
input[type="number"] {
    padding: 10px 14px;
    border: 1px solid var(--md-grey-200);
    border-radius: 6px;
    font-size: 16px;
    color: var(--on-surface-color);
    background-color: var(--md-grey-100);
    outline: none;
    width: 60px;
    height: 38px;
    line-height: normal;
    text-align: center;
    transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out, background-color 0.2s ease-in-out;
    box-sizing: border-box;
    appearance: none;
    -moz-appearance: textfield;
}

input[type="number"]:focus {
    background-color: var(--surface-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(66, 133, 244, 0.2),
                inset 0 1px 2px rgba(0,0,0,0.05);
}

/* 이전 원형 버튼 스타일 복원 */
.input-group button[type="button"] {
    background-color: var(--surface-color);
    color: var(--md-grey-600);
    border: 1px solid var(--border-color);
    padding: 0;
    width: 36px; 
    height: 36px; 
    border-radius: 50%; /* 원형 */
    font-size: 20px;
    font-weight: 400;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out, border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    line-height: 34px;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 1px 1px rgba(0,0,0,0.05);
}

.input-group button[type="button"]:hover {
    background-color: var(--md-grey-100);
    border-color: var(--md-grey-600);
    color: var(--md-grey-800);
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.input-group button[type="button"]:active {
    background-color: var(--md-grey-200);
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
}

/* 기본 버튼 (Material Contained Button) */
button {
    background-color: var(--primary-color);
    color: var(--md-white);
    border: none;
    padding: 10px 24px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase; /* Material Standard */
    letter-spacing: 0.5px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    transition: background-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    outline: none;
}

button:hover {
    background-color: var(--primary-dark-color);
    box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
}

button:active {
    background-color: var(--primary-dark-color);
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.2);
}

/* 재시작 버튼 (Danger color) */
#restart-btn {
    background-color: var(--danger-color);
}

#restart-btn:hover {
    background-color: var(--danger-dark-color);
}

/* 참가자 이름 입력 필드 (Material Text Field) */
#players-container input[type="text"] {
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 4px; /* Material Standard */
    font-size: 16px;
    color: var(--on-surface-color);
    background-color: var(--background-color); /* 배경색 */
    outline: none;
    width: 100%;
    max-width: 250px; /* 최대 너비 제한 */
    transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    box-sizing: border-box;
}

#players-container input[type="text"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(66, 133, 244, 0.2); /* 포커스 효과 */
}

.player-input {
    margin: 16px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.player-input label {
    width: 80px; /* 레이블 너비 고정 */
    text-align: right;
    color: var(--md-grey-600);
    font-size: 14px;
    font-weight: 500;
}


#race-container {
    width: 100%;
    display: flex;
    flex-direction: column;
}

#canvas-container {
    width: 100%;
    height: 60vh; /* 화면 높이의 60% */
    min-height: 450px; /* 최소 높이 */
    max-height: 600px; /* 최대 높이 */
    position: relative;
    background-color: var(--md-grey-200); /* Canvas 배경색 조정 */
}

#race-info {
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
}

#race-status {
    font-size: 16px;
    font-weight: 500;
    color: var(--on-surface-color);
}

#race-result {
    padding: 24px;
    text-align: center;
    font-size: 16px;
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    color: var(--on-surface-color);
}

#race-result h2 {
    margin-bottom: 16px;
    font-size: 18px;
    font-weight: 500;
}

.winner {
    color: var(--primary-color);
    font-weight: 700; /* Bold */
    font-size: 20px;
    margin: 8px 0;
}

/* 뒤로가기 아이콘 버튼 (Material Icon Button) */
.back-button {
    position: absolute;
    top: 16px;
    left: 16px;
    background: none;
    border: none;
    color: var(--md-grey-600); /* 아이콘 색상 */
    font-size: 24px; /* 아이콘 크기 */
    cursor: pointer;
    padding: 8px; /* 클릭 영역 확보 */
    border-radius: 50%; /* 원형 배경 */
    transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
    width: 40px; /* 버튼 크기 */
    height: 40px; /* 버튼 크기 */
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: none; /* 기본 버튼 스타일 제거 */
    text-transform: none; /* 기본 버튼 스타일 제거 */
    letter-spacing: normal; /* 기본 버튼 스타일 제거 */
}

.back-button:hover {
    background-color: var(--md-grey-200); /* 호버 시 배경 */
    color: var(--md-grey-800); /* 호버 시 아이콘 색상 */
    box-shadow: none; /* 기본 버튼 스타일 제거 */
}

.back-button:active {
    background-color: var(--md-grey-300); /* 클릭 시 배경 */
    box-shadow: none; /* 기본 버튼 스타일 제거 */
}

/* 버튼 그룹 정렬 */
.button-group {
    margin-top: 24px;
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* 미디어 쿼리 추가 (선택 사항 - 작은 화면 조정) */
@media (max-width: 600px) {
    .container {
        border-radius: 0;
        box-shadow: none;
        min-height: 100vh;
    }
    .setup-panel {
        padding: 24px 16px;
    }
    h1 {
        font-size: 20px;
    }
    h2 {
        font-size: 16px;
    }
    .player-input {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }
    .player-input label {
        width: auto;
        text-align: left;
        margin-bottom: 4px;
    }
    #players-container input[type="text"] {
        max-width: none; /* 작은 화면에서는 최대 너비 제한 해제 */
    }
    .back-button {
        top: 8px;
        left: 8px;
    }
    #race-info {
        padding: 8px 16px;
    }
    #race-result {
        padding: 16px;
    }
}