/* ════════════════════════════════════════════════
   Deep Sleep - 수면 가이드 앱 스타일
   ════════════════════════════════════════════════ */

:root {
    --bg-top:     #0a0e27;
    --bg-mid:     #111640;
    --bg-bottom:  #080c1f;
    --text-main:  #e0e6ed;
    --text-dim:   #5a6a7e;
    --accent:     rgba(100, 149, 237, 1);
    --accent-glow:rgba(100, 149, 237, 0.25);
    --purple-glow:rgba(147, 112, 219, 0.35);
    --green-glow: rgba(60, 179, 113, 0.25);
}

/* ── 리셋 ── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    background-color: var(--bg-bottom);  /* 하단 흰색 바 방지 */
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo',
                 'Malgun Gothic', 'Segoe UI', sans-serif;
    -webkit-font-smoothing: antialiased;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
    color: var(--text-main);
    background: linear-gradient(
        180deg,
        var(--bg-top) 0%,
        var(--bg-mid) 45%,
        #0f1238 70%,
        var(--bg-bottom) 100%
    );
    min-height: 100vh;
    min-height: 100dvh;
    overflow: hidden;
}

/* ════════════════════════
   앱 레이아웃
   ════════════════════════ */
.app {
    position: relative;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ── 뷰 전환 ── */
.view {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 24px;
    padding-top: calc(40px + env(safe-area-inset-top, 0px));
    padding-bottom: calc(40px + env(safe-area-inset-bottom, 0px));
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.8s ease;
}

.view.active {
    opacity: 1;
    pointer-events: auto;
}

/* ════════════════════════
   대기 화면 (Idle)
   ════════════════════════ */
.app-title {
    font-size: 34px;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #e0e6ed 30%, #7b8fa8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.app-subtitle {
    font-size: 14px;
    color: var(--text-dim);
    line-height: 1.6;
    margin-bottom: 8px;
}

/* ── 대기 원형 (작은 버전) ── */
.orb-container {
    width: 280px;
    height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.orb-sm {
    width: 120px;
    height: 120px;
}

.idle-orb {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(100,149,237,0.2) 0%, rgba(100,149,237,0.02) 70%);
    border: 1px solid rgba(100,149,237,0.18);
    box-shadow: 0 0 30px rgba(100,149,237,0.12);
    animation: idle-pulse 5s ease-in-out infinite;
}

@keyframes idle-pulse {
    0%, 100% { transform: scale(1);    opacity: 0.5; }
    50%      { transform: scale(1.12); opacity: 1;   }
}

/* ── 사운드 선택 ── */
.section-label {
    font-size: 12px;
    color: var(--text-dim);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.beat-options {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    max-width: 340px;
    margin-bottom: 20px;
}

.beat-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 22px;
    border: 1px solid rgba(255,255,255,0.06);
    background: rgba(255,255,255,0.03);
    color: var(--text-dim);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

.beat-chip:active {
    transform: scale(0.96);
}

.beat-chip.active {
    border-color: rgba(100,149,237,0.4);
    background: rgba(100,149,237,0.1);
    color: var(--text-main);
    box-shadow: 0 0 16px rgba(100,149,237,0.1);
}

.beat-chip.playing .chip-icon::after {
    content: '';
    display: inline-block;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: rgba(100,149,237,0.9);
    margin-left: 2px;
    vertical-align: middle;
    animation: preview-dot 0.6s ease-in-out infinite alternate;
}

@keyframes preview-dot {
    0%   { opacity: 0.3; transform: scale(0.8); }
    100% { opacity: 1;   transform: scale(1.3); }
}

.chip-icon {
    font-size: 16px;
    flex-shrink: 0;
}

.chip-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1px;
}

.chip-name {
    font-weight: 600;
    font-size: 13px;
    line-height: 1.2;
}

.chip-desc {
    font-size: 10px;
    opacity: 0.6;
    line-height: 1.2;
}

/* ── 호흡 횟수 선택 ── */
.cycle-options {
    display: flex;
    gap: 8px;
    margin-bottom: 18px;
}

.cycle-chip {
    padding: 9px 18px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.06);
    background: rgba(255,255,255,0.03);
    color: var(--text-dim);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

.cycle-chip:active {
    transform: scale(0.96);
}

.cycle-chip.active {
    border-color: rgba(100,149,237,0.4);
    background: rgba(100,149,237,0.1);
    color: var(--text-main);
    box-shadow: 0 0 12px rgba(100,149,237,0.08);
}

/* ── 볼륨 슬라이더 ── */
.volume-slider-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 80%;
    max-width: 300px;
    margin: 0 auto 24px;
}

.vol-icon {
    font-size: 16px;
    opacity: 0.6;
    flex-shrink: 0;
}

.volume-slider {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: transparent;
    border-radius: 2px;
    outline: none;
    border: none;
    position: relative;
    z-index: 0;
    touch-action: none;
    will-change: contents;
    contain: layout style;
}

/* Webkit Track (Chrome, Safari, Edge) */
.volume-slider::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    background: rgba(255,255,255,0.1);
    border-radius: 2px;
    border: none;
    cursor: pointer;
}

/* Webkit Thumb */
.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--text-main);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(255,255,255,0.3);
    border: none;
    margin-top: -8px;
    position: relative;
    z-index: 1;
    will-change: transform;
    transform: translateZ(0);
}

/* Firefox Track */
.volume-slider::-moz-range-track {
    width: 100%;
    height: 4px;
    background: rgba(255,255,255,0.1);
    border-radius: 2px;
    border: none;
    cursor: pointer;
}

/* Firefox Thumb */
.volume-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--text-main);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(255,255,255,0.3);
    border: none;
    will-change: transform;
    transform: translateZ(0);
}

/* 수면 화면 볼륨 슬라이더 — 더 절제된 스타일 */
.sleep-volume {
    margin-top: 4px;
    margin-bottom: 12px;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.sleep-volume:hover,
.sleep-volume:active {
    opacity: 1;
}

/* ── 시작 버튼 ── */
.btn-start {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 36px;
    border-radius: 40px;
    border: 1px solid rgba(255,255,255,0.12);
    background: rgba(255,255,255,0.06);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: #fff;
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s, transform 0.2s;
    box-shadow: 0 4px 20px rgba(0,0,0,0.25);
    outline: none;
}

.btn-start:active {
    transform: scale(0.96);
    background: rgba(255,255,255,0.12);
}

.hint {
    margin-top: 18px;
    font-size: 11px;
    color: var(--text-dim);
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

/* ════════════════════════
   호흡 가이드 화면
   ════════════════════════ */
.cycle-label {
    font-size: 14px;
    color: var(--text-dim);
    letter-spacing: 1px;
    margin-bottom: 6px;
}

/* ── 호흡 원형 ── */
.breath-orb {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(100,149,237,0.15);
    border: 1.5px solid rgba(100,149,237,0.3);
    box-shadow: 0 0 30px var(--accent-glow);
    transform: scale(1);
    will-change: transform;
    transition: transform 4s ease-in-out,
                background 0.6s ease,
                border-color 0.6s ease,
                box-shadow 0.8s ease;
}

.breath-orb.inhale {
    transform: scale(2.1);
    background: rgba(147,112,219,0.25);
    border-color: rgba(147,112,219,0.45);
    box-shadow: 0 0 60px var(--purple-glow), 0 0 120px rgba(147,112,219,0.1);
}

.breath-orb.hold {
    transform: scale(2.1);
    background: rgba(100,149,237,0.18);
    border-color: rgba(100,149,237,0.35);
    box-shadow: 0 0 40px var(--accent-glow), 0 0 80px rgba(100,149,237,0.08);
}

.breath-orb.exhale {
    transform: scale(1);
    background: rgba(60,179,113,0.15);
    border-color: rgba(60,179,113,0.35);
    box-shadow: 0 0 30px var(--green-glow);
}

.breath-label {
    font-size: 18px;
    font-weight: 600;
    color: rgba(255,255,255,0.9);
    text-shadow: 0 1px 8px rgba(0,0,0,0.4);
    z-index: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
    padding: 0 8px;
}

/* ── 카운트다운 ── */
.countdown {
    font-size: 56px;
    font-weight: 300;
    color: rgba(255,255,255,0.85);
    min-height: 72px;
    font-variant-numeric: tabular-nums;
    text-shadow: 0 2px 12px rgba(0,0,0,0.3);
    margin-top: 4px;
}

/* ════════════════════════
   수면 비트 화면
   ════════════════════════ */
.sleep-moon {
    font-size: 44px;
    margin-bottom: 14px;
    animation: moon-float 6s ease-in-out infinite;
}

@keyframes moon-float {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-6px); }
}

.sleep-title {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: 6px;
}

.sleep-desc {
    font-size: 13px;
    color: var(--text-dim);
}

/* ── 파도 애니메이션 ── */
.wave-container {
    position: relative;
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 24px 0;
}

.sleep-wave {
    position: absolute;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 1px solid rgba(100,149,237,0.3);
    animation: wave-expand 3.5s ease-out infinite;
}

.w-delay-1 { animation-delay: 1.2s; }
.w-delay-2 { animation-delay: 2.4s; }

@keyframes wave-expand {
    0%   { transform: scale(1);   opacity: 0.5; }
    100% { transform: scale(3.5); opacity: 0;   }
}

/* ── 남은 시간 ── */
.remaining-block {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 10px;
}

.remaining-value {
    font-size: 46px;
    font-weight: 300;
    font-variant-numeric: tabular-nums;
    color: rgba(255,255,255,0.85);
}

.remaining-unit {
    font-size: 15px;
    color: var(--text-dim);
}

.sleep-lock-hint {
    font-size: 11px;
    color: var(--text-dim);
    opacity: 0.5;
    margin-bottom: 24px;
}

/* ════════════════════════
   종료 버튼 (공용)
   ════════════════════════ */
.btn-stop {
    padding: 12px 28px;
    border-radius: 30px;
    border: 1px solid rgba(255,255,255,0.08);
    background: rgba(255,255,255,0.04);
    color: var(--text-dim);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    outline: none;
}

.btn-stop:active {
    background: rgba(255,255,255,0.1);
    color: var(--text-main);
}