/* ===== 기본 설정 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
}

body {
    background: #1e1e2f;
    color: #ffffff;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 20px 20px;
}

/* ===== 헤더 ===== */
header {
    width: 100%;
    display: flex;
    justify-content: flex-start;
    margin-bottom: 10px;
}

header button {
    background: none;
    border: none;
    color: #8f90ff;
    font-size: 1rem;
    cursor: pointer;
    transition: color 0.3s;
}

header button:hover {
    color: #ffffff;
}

/* ===== 타이머 표시 ===== */
#timerDisplay {
    font-size: 7rem;
    font-weight: 700;
    text-align: center;
    color: #ffffff;
    letter-spacing: 2px;
}

/* ===== 입력 영역 ===== */
.input-group {
    margin: 15px 0 30px;
    text-align: center;
}

input[type="number"] {
    width: 70px;
    padding: 10px;
    margin: 0 5px;
    border: 1px solid #3a3a50;
    border-radius: 12px;
    background: #2b2b3d;
    color: #fff;
    font-size: 1rem;
    text-align: center;
    transition: border 0.3s, background 0.3s;
}

input[type="number"]:focus {
    outline: none;
    border-color: #7a7aff;
    background: #35354a;
}

/* ===== 버튼 스타일 ===== */
button {
    padding: 12px 20px;
    border: none;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    background: #2b2b3d;
    color: #ddd;
}

button:hover {
    background: #3a3a50;
    color: #fff;
}

/* ===== 시간 증가/감소 버튼 ===== */
button[data-adjust] {
    border: 2px solid transparent;
}

.plus-group button {
    border-color: rgba(77, 110, 255, 0.3);
}

.plus-group button:hover {
    border-color: rgba(77, 110, 255, 0.5);
}

.minus-group button {
    border-color: rgba(255, 111, 111, 0.3);
}

.minus-group button:hover {
    border-color: rgba(255, 111, 111, 0.5);
}

/* ===== 메인 버튼 ===== */
#startBtn {
    background: #2e8b57;
    color: #fff;
}

#pauseBtn {
    background: #d45d5d;
    color: #fff;
}

#resetBtn {
    background: #6a5acd;
    color: #fff;
}

#startBtn:hover,
#pauseBtn:hover,
#resetBtn:hover {
    transform: scale(1.05);
}

/* ===== 중앙 정렬 그룹 ===== */
.plus-group,
.minus-group,
.repeat-group {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 15px 0;
    flex-wrap: wrap;
}

.buttons-group {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    gap: 15px;
}

/* ===== 체크박스 ===== */
label {
    font-size: 0.9rem;
    color: #bbb;
    margin-left: 10px;
}

input[type="checkbox"] {
    accent-color: #7a7aff;
    transform: scale(1.2);
    margin-right: 6px;
}

/* ===== 알람 효과 ===== */
@keyframes glow {

    0%,
    100% {
        color: #fff;
        text-shadow: 0 0 8px rgba(255, 50, 50, 0.6);
    }

    50% {
        color: #ff4d4d;
        text-shadow: 0 0 20px rgba(255, 80, 80, 0.9);
    }
}

#timerDisplay.alarm {
    animation: glow 1s ease-in-out infinite;
}

/* ===== 화면 Overlay ===== */
#alarmOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 0, 0, 0.7);
    opacity: 0;
    pointer-events: none;
    z-index: 999;
}

#alarmOverlay.active {
    animation: overlay-blink 1s ease-in-out infinite;
}

@keyframes overlay-blink {

    0%,
    100% {
        opacity: 0;
    }

    50% {
        opacity: 1;
    }
}

/* ===== 알람 선택 영역 ===== */
#alarmSelector {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
    margin: 20px 0;
}

#alarmSelector input {
    display: none;
}

.alarmOption {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 72px;
    height: 72px;
    border-radius: 12px;
    border: 2px solid #3a3a50;
    background: #2b2b3d;
    color: #bbb;
    font-size: 26px;
    cursor: pointer;
    transition: all 0.2s;
}

.alarmOption:hover {
    background: #34344a;
    border-color: #7a7aff;
    color: #fff;
}

#alarmSelector input:checked+.alarmOption {
    border-color: #7a7aff;
    background: #35355a;
    color: #fff;
}