/* =========================================================
   common.css
   학생·교사 공통 스타일
========================================================= */

/* Asta Sans 파일을 준비하면 활성화 */
@font-face {
  font-family: "Asta Sans";
  src: url("../fonts/AstaSans.woff2") format("woff2");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

:root {
  --font-ui:
    "Asta Sans",
    "Pretendard",
    "Noto Sans KR",
    "Apple SD Gothic Neo",
    "Malgun Gothic",
    system-ui,
    sans-serif;

  --ink: #1a1a1a;
  --paper: #fafafa;
  --surface: #ffffff;
  --line: #e3e3e3;
  --muted: #737373;

  --comp: #2b6cb0;
  --writing: #2f855a;
  --danger: #c0392b;
  --teacher: #5b21b6;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --space-xs: 6px;
  --space-sm: 10px;
  --space-md: 16px;
  --space-lg: 24px;

  --touch-size: 48px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.6;
  word-break: keep-all;
  overflow-wrap: break-word;
}

body,
button,
input,
textarea,
select {
  font-family: var(--font-ui);
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  touch-action: manipulation;
}

img {
  display: block;
  max-width: 100%;
}

[hidden] {
  display: none !important;
}

/* 숫자 정렬 */
.round-period,
.round-status,
.wc-counter,
.sub-count,
.score-input,
input[type="number"],
input[type="datetime-local"] {
  font-variant-numeric: tabular-nums;
}

/* 공통 입력창 (라디오·체크박스 제외) */
input:not([type="radio"]):not([type="checkbox"]),
textarea,
select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--ink);
  font-size: 16px;
}

/* 라디오·체크박스는 기본 크기 유지 + 축소 방지 */
input[type="radio"],
input[type="checkbox"] {
  width: auto;
  flex: 0 0 auto;
  margin: 0;
  cursor: pointer;
}

input:focus,
textarea:focus,
select:focus {
  outline: 3px solid rgba(43, 108, 176, 0.15);
  border-color: var(--comp);
}

textarea {
  min-height: 160px;
  resize: vertical;
}

.field {
  margin-bottom: 14px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

/* 공통 버튼 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: var(--touch-size);
  margin-top: 8px;
  padding: 12px 20px;
  border: 0;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
}

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

.btn-secondary {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.btn-teacher {
  background: var(--teacher);
  color: #fff;
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-sm {
  width: auto;
  min-height: 38px;
  margin-top: 0;
  padding: 7px 14px;
  font-size: 13px;
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

/* 공통 헤더 */
header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
}

header h1 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
}

header p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.logout-btn {
  flex-shrink: 0;
  padding: 8px 10px;
  border: 0;
  background: none;
  color: var(--muted);
  font-size: 13px;
  cursor: pointer;
}

/* 공통 화면 */
.screen {
  display: none;
  width: 100%;
  margin: 0 auto;
  padding: 20px;
}

.screen.active {
  display: block;
}

/* 공통 로딩 */
.loader {
  width: 28px;
  height: 28px;
  margin: 40px auto;
  border: 3px solid #eee;
  border-top-color: var(--ink);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* 키보드 사용자 접근성 */
button:focus-visible,
a:focus-visible,
.choice:focus-visible,
.round-card:focus-visible {
  outline: 3px solid rgba(43, 108, 176, 0.35);
  outline-offset: 2px;
}