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

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    /* Chặn double-tap zoom + pinch zoom của iOS Safari (viewport meta
       một mình không đủ trên iOS 13+) */
    touch-action: manipulation;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

/* Ép luôn touch-action: manipulation lên mọi vùng tương tác chính
   để iOS Safari không phát hiện double-tap zoom dù tap nhanh 2 lần */
.app-phase,
.app-phase * {
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

/* ===== Design tokens ===== */
:root {
    /* Loading & soft pinks */
    --pink-50:  #FFF5F7;
    --pink-100: #FFE6EC;
    --pink-200: #FFD0DA;
    --pink-300: #F7B6C2;
    --pink-500: #E89AAB;
    --pink-700: #B85C6F;
    --pink-900: #7a3a48;

    /* Phase 2 — warm tan */
    --tan-200: #E8D4C5;
    --tan-400: #C9A99A;
    --tan-600: #8d6f5e;
    --cream:   #fff7ef;

    /* Fonts */
    --font-display: "Cormorant Garamond", "Petemoss", serif;
    --font-script:  "Petemoss", "Shantell Sans", cursive;
    --font-ui:      "Roboto", system-ui, sans-serif;

    /* Timing */
    --ease-out-strong: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

body {
    font-family: var(--font-ui);
    /* Tan-400 matches the middle of the Phase 2 gradient → any GPU
       composite hiccup during the rain shows a tan colour instead of
       flashing white through the page background. */
    background: var(--tan-400);
    color: var(--pink-900);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html { background: var(--tan-400); }

/* ===== App phases visibility ===== */
.app-phase {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.8s var(--ease-in-out);
}

.app-phase.is-active {
    opacity: 1;
    pointer-events: auto;
}

/* prevent text selection across the whole experience */
.app-phase,
.app-phase * {
    user-select: none;
    -webkit-user-select: none;
}

/* Utility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

/* ===== Music Toggle Button ===== */
#musicToggle {
    position: fixed;
    top: 20px;
    right: 20px;
    font-size: 20px;
    background: linear-gradient(135deg, rgba(220, 38, 38, 0.2), rgba(185, 28, 28, 0.3));
    border: 2px solid rgba(220, 38, 38, 0.6);
    border-radius: 50%;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 9999;
    box-shadow: 0 4px 15px rgba(220, 38, 38, 0.4), 0 0 20px rgba(220, 38, 38, 0.2);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    color: #fff;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 0;
}

#musicToggle svg {
    width: 24px;
    height: 24px;
    fill: #fff;
    filter: drop-shadow(0 0 4px rgba(255, 255, 255, 0.6));
}

#musicToggle:hover {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.4), rgba(220, 38, 38, 0.5));
    border-color: rgba(239, 68, 68, 0.9);
    box-shadow: 0 6px 25px rgba(239, 68, 68, 0.6), 0 0 30px rgba(239, 68, 68, 0.4);
    transform: scale(1.1);
}

#musicToggle:active {
    transform: scale(0.95);
}

@keyframes pulse-heart {
    0%, 100% {
        box-shadow: 0 4px 15px rgba(220, 38, 38, 0.4), 0 0 20px rgba(220, 38, 38, 0.2);
    }
    50% {
        box-shadow: 0 4px 20px rgba(239, 68, 68, 0.6), 0 0 30px rgba(239, 68, 68, 0.4);
    }
}

#musicToggle.playing {
    animation: pulse-heart 2s ease-in-out infinite;
}

#musicToggle .icon-pause { display: none; }
#musicToggle.playing .icon-play { display: none; }
#musicToggle.playing .icon-pause { display: block; }

/* ===== Preview Notice — nằm ngay dưới phần mã PIN ===== */
#previewNotice {
    display: inline-block;
    margin: 16px auto 0;
    padding: 8px 16px;
    border-radius: 999px;
    background: linear-gradient(135deg, rgba(220, 38, 38, 0.88), rgba(190, 24, 93, 0.88));
    color: #fff;
    font-family: var(--font-ui);
    font-size: 13px;
    line-height: 1.3;
    letter-spacing: 0.2px;
    box-shadow: 0 4px 14px rgba(190, 24, 93, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.18) inset;
    white-space: nowrap;
    pointer-events: none;
    animation: previewFadeIn 0.6s ease 0.3s both, previewPulse 2.4s ease-in-out 1s infinite;
}

#previewNotice .preview-tag {
    display: inline-block;
    padding: 2px 8px;
    margin-right: 6px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.22);
    font-weight: 700;
    font-size: 11px;
    letter-spacing: 0.6px;
}

#previewNotice strong {
    color: #FFD8A8;
    font-weight: 700;
    letter-spacing: 1px;
}

@keyframes previewFadeIn {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes previewPulse {
    0%, 100% { box-shadow: 0 4px 14px rgba(190, 24, 93, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.18) inset; }
    50%      { box-shadow: 0 4px 20px rgba(239, 68, 68, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.25) inset; }
}

/* ===== Home Button — góc trái trên, chỉ hiện ở chế độ xem thử ===== */
#homeButton {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 9999;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px 10px 12px;
    border-radius: 999px;
    background: linear-gradient(135deg, rgba(220, 38, 38, 0.88), rgba(190, 24, 93, 0.88));
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: #fff;
    font-family: var(--font-ui);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.2px;
    text-decoration: none;
    box-shadow: 0 4px 14px rgba(190, 24, 93, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.12) inset;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
    animation: previewFadeIn 0.6s ease 0.3s both;
}

#homeButton svg {
    width: 18px;
    height: 18px;
    fill: #fff;
    filter: drop-shadow(0 0 3px rgba(255, 255, 255, 0.5));
}

#homeButton:hover {
    transform: translateY(-1px) scale(1.03);
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.95), rgba(219, 39, 119, 0.95));
    box-shadow: 0 6px 22px rgba(239, 68, 68, 0.55), 0 0 0 1px rgba(255, 255, 255, 0.2) inset;
}

#homeButton:active {
    transform: scale(0.97);
}

@media (max-width: 480px) {
    #previewNotice {
        font-size: 12px;
        padding: 7px 14px;
        margin-top: 14px;
    }
    #musicToggle { top: 14px; right: 14px; width: 48px; height: 48px; }
    #homeButton {
        top: 14px;
        left: 14px;
        padding: 8px 14px 8px 10px;
        font-size: 13px;
        gap: 6px;
    }
    #homeButton svg { width: 16px; height: 16px; }
}