/* =========================================================
   base.css — 设计令牌 / 主题 / 全局骨架 / 锁屏 / 导航
   二次开发基础：MoLeft/LoveDiary-Timeline (MIT)
   原项目仅提供单一 style.css；此处重建为「令牌 + 组件」双层结构
   ========================================================= */

/* ---------- 设计令牌：浅色（温馨奶油玫瑰） ---------- */
:root {
    --cream:        #FFF7F3;
    --cream-2:      #FDEDE6;
    --blush:        #FFE6E4;
    --rose:         #E8899A;
    --rose-soft:    #F4B3BE;
    --rose-deep:    #C9687C;
    --gold:         #E3B183;
    --sage:         #9DB5A4;

    --ink:          #4A3B3F;
    --ink-2:        #7A666B;
    --ink-3:        #A9959A;

    --surface:      rgba(255, 255, 255, 0.72);
    --surface-solid:#FFFDFB;
    --line:         rgba(201, 104, 124, 0.14);
    --line-strong:  rgba(201, 104, 124, 0.26);

    --shadow-sm:    0 2px 10px rgba(180, 120, 130, 0.08);
    --shadow-md:    0 10px 30px rgba(180, 120, 130, 0.12);
    --shadow-lg:    0 22px 60px rgba(160, 100, 115, 0.18);

    --r-sm: 12px;
    --r-md: 18px;
    --r-lg: 26px;
    --r-xl: 34px;

    --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
    --ease-out-back: cubic-bezier(0.34, 1.4, 0.64, 1);

    --maxw: 1080px;
    --tabbar-h: 62px;

    --font-serif: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif SC", Georgia, serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
                 "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
}

/* ---------- 设计令牌：夜间（继承原项目 data-theme 机制） ---------- */
body[data-theme="dark"] {
    --cream:        #1C1719;
    --cream-2:      #241D21;
    --blush:        #33262C;
    --rose:         #E094A4;
    --rose-soft:    #8E5F6C;
    --rose-deep:    #F0AEBB;
    --gold:         #D6A97F;
    --sage:         #8FA894;

    --ink:          #F1E6E8;
    --ink-2:        #C3B0B5;
    --ink-3:        #8F7C82;

    --surface:      rgba(255, 255, 255, 0.055);
    --surface-solid:#251E22;
    --line:         rgba(255, 255, 255, 0.09);
    --line-strong:  rgba(255, 255, 255, 0.18);

    --shadow-sm:    0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-md:    0 10px 30px rgba(0, 0, 0, 0.38);
    --shadow-lg:    0 22px 60px rgba(0, 0, 0, 0.5);
}

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

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

body {
    margin: 0;
    font-family: var(--font-sans);
    color: var(--ink);
    background: var(--cream);
    line-height: 1.68;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    transition: background .5s var(--ease), color .5s var(--ease);
}

body.is-locked { overflow: hidden; height: 100vh; }

img { max-width: 100%; display: block; }
svg { width: 100%; height: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; border: 0; background: none; cursor: pointer; }
textarea, input { font: inherit; color: inherit; }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: .02em; }
p { margin: 0; }

::selection { background: var(--rose-soft); color: #fff; }

/* 主背景氛围：柔和的双色光斑 */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -2;
    background:
        radial-gradient(58% 42% at 12% 6%,  color-mix(in srgb, var(--rose) 26%, transparent) 0%, transparent 62%),
        radial-gradient(52% 40% at 88% 14%, color-mix(in srgb, var(--gold) 24%, transparent) 0%, transparent 60%),
        radial-gradient(60% 48% at 50% 104%, color-mix(in srgb, var(--sage) 18%, transparent) 0%, transparent 64%);
    pointer-events: none;
}

/* ---------- 飘落花瓣 ---------- */
.petals { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.petals[hidden] { display: none; }

.petal {
    position: absolute;
    top: -6vh;
    color: var(--rose-soft);
    opacity: 0;
    animation: fall linear infinite;
}
.petal svg { width: 100%; height: 100%; }

@keyframes fall {
    0%   { transform: translate3d(0, -8vh, 0) rotate(0deg);      opacity: 0; }
    12%  { opacity: .75; }
    88%  { opacity: .5; }
    100% { transform: translate3d(6vw, 108vh, 0) rotate(420deg);  opacity: 0; }
}

/* =========================================================
   锁屏（结构沿用原项目 6 位数字键盘，视觉与交互重做）
   ========================================================= */
.lock-screen {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: grid;
    place-items: center;
    padding: 24px;
    background:
        radial-gradient(70% 50% at 50% 0%, color-mix(in srgb, var(--rose) 32%, transparent), transparent 70%),
        var(--cream);
    transition: opacity .6s var(--ease), visibility .6s;
}
.lock-screen.is-open { opacity: 0; visibility: hidden; }

.lock-inner { width: 100%; max-width: 330px; text-align: center; }

.lock-heart {
    width: 52px; height: 48px;
    margin: 0 auto 18px;
    fill: var(--rose);
    filter: drop-shadow(0 6px 16px color-mix(in srgb, var(--rose) 45%, transparent));
    animation: beat 1.9s var(--ease) infinite;
}
@keyframes beat {
    0%, 100% { transform: scale(1); }
    14%      { transform: scale(1.16); }
    28%      { transform: scale(1); }
    42%      { transform: scale(1.09); }
}

.lock-title {
    font-family: var(--font-serif);
    font-size: 1.32rem;
    letter-spacing: .06em;
    color: var(--ink);
}
.lock-hint {
    margin-top: 8px;
    font-size: .82rem;
    color: var(--ink-3);
    letter-spacing: .05em;
    min-height: 1.4em;
    transition: color .3s;
}
.lock-hint.is-error { color: var(--rose-deep); }

.lock-dots { display: flex; justify-content: center; gap: 14px; margin: 26px 0 34px; }
.lock-dots .dot {
    width: 11px; height: 11px;
    border-radius: 50%;
    border: 1.5px solid var(--line-strong);
    background: transparent;
    transition: all .28s var(--ease-out-back);
}
.lock-dots .dot.filled {
    background: var(--rose);
    border-color: var(--rose);
    transform: scale(1.24);
    box-shadow: 0 3px 10px color-mix(in srgb, var(--rose) 50%, transparent);
}
.lock-dots.is-shake { animation: shake .42s var(--ease); }
@keyframes shake {
    0%,100% { transform: translateX(0); }
    20% { transform: translateX(-9px); }
    40% { transform: translateX(8px); }
    60% { transform: translateX(-5px); }
    80% { transform: translateX(3px); }
}

.keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}
.key {
    height: 66px;
    display: grid;
    place-items: center;
    font-size: 1.42rem;
    font-weight: 300;
    letter-spacing: .04em;
    color: var(--ink);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 50%;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: transform .16s var(--ease), background .2s, box-shadow .2s;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}
.key:active, .key.active {
    transform: scale(.9);
    background: color-mix(in srgb, var(--rose) 22%, var(--surface-solid));
    box-shadow: none;
}
.key-ghost { background: none; border: 0; box-shadow: none; pointer-events: none; }
.key-del { color: var(--ink-2); }
.key-del svg { width: 25px; height: 25px; }

/* =========================================================
   顶部导航
   ========================================================= */
.topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 90;
    padding: 12px 20px;
    background: color-mix(in srgb, var(--cream) 72%, transparent);
    backdrop-filter: blur(16px) saturate(1.2);
    -webkit-backdrop-filter: blur(16px) saturate(1.2);
    border-bottom: 1px solid transparent;
    transition: border-color .35s, padding .35s var(--ease), background .35s;
}
.topbar.is-stuck { padding: 8px 20px; border-bottom-color: var(--line); }

.topbar-inner {
    max-width: var(--maxw);
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 20px;
}

.brand { display: flex; align-items: center; gap: 9px; margin-right: auto; }
.brand-mark { width: 20px; height: 18px; fill: var(--rose); flex: none; }
.brand-text {
    font-family: var(--font-serif);
    font-size: 1.02rem;
    letter-spacing: .1em;
    white-space: nowrap;
}

.nav { display: flex; gap: 4px; }
.nav-link {
    position: relative;
    padding: 7px 15px;
    font-size: .86rem;
    color: var(--ink-2);
    border-radius: 999px;
    transition: color .25s, background .25s;
}
.nav-link:hover { color: var(--ink); background: var(--surface); }
.nav-link.is-active { color: var(--rose-deep); background: color-mix(in srgb, var(--rose) 15%, transparent); }

.icon-btn {
    width: 38px; height: 38px;
    flex: none;
    display: grid;
    place-items: center;
    color: var(--ink-2);
    border-radius: 50%;
    border: 1px solid var(--line);
    background: var(--surface);
    transition: transform .3s var(--ease), color .25s, border-color .25s;
}
.icon-btn svg { width: 19px; height: 19px; }
.icon-btn:hover { color: var(--rose-deep); border-color: var(--line-strong); transform: rotate(45deg); }
#settings-close:hover, .lb-close:hover { transform: rotate(90deg); }

/* =========================================================
   底部 Tab（移动端专属，原项目无此模块）
   ========================================================= */
.tabbar {
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 95;
    display: none;
    padding-bottom: env(safe-area-inset-bottom);
    background: color-mix(in srgb, var(--cream) 88%, transparent);
    backdrop-filter: blur(18px) saturate(1.3);
    -webkit-backdrop-filter: blur(18px) saturate(1.3);
    border-top: 1px solid var(--line);
}
.tab {
    flex: 1;
    height: var(--tabbar-h);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    color: var(--ink-3);
    font-size: .64rem;
    letter-spacing: .04em;
    transition: color .25s;
    -webkit-tap-highlight-color: transparent;
}
.tab svg { width: 21px; height: 21px; transition: transform .34s var(--ease-out-back); }
.tab.is-active { color: var(--rose-deep); }
.tab.is-active svg { transform: translateY(-2px) scale(1.1); }

/* =========================================================
   通用：按钮 / 开关 / Toast / 入场动画
   ========================================================= */
.btn-primary {
    padding: 9px 22px;
    font-size: .85rem;
    letter-spacing: .06em;
    color: #fff;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--rose), var(--rose-deep));
    box-shadow: 0 6px 18px color-mix(in srgb, var(--rose) 42%, transparent);
    transition: transform .22s var(--ease-out-back), box-shadow .25s, opacity .2s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 26px color-mix(in srgb, var(--rose) 52%, transparent); }
.btn-primary:active { transform: scale(.96); }
.btn-primary:disabled { opacity: .45; box-shadow: none; transform: none; cursor: default; }

.btn-ghost {
    padding: 10px 16px;
    font-size: .82rem;
    color: var(--ink-2);
    border: 1px solid var(--line);
    border-radius: var(--r-sm);
    background: var(--surface);
    transition: color .2s, border-color .2s, background .2s;
}
.btn-ghost:hover { color: var(--ink); border-color: var(--line-strong); }
.btn-danger:hover { color: #fff; background: var(--rose-deep); border-color: var(--rose-deep); }

.switch { position: relative; flex: none; width: 46px; height: 27px; }
.switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.slider {
    position: absolute; inset: 0;
    border-radius: 999px;
    background: var(--line-strong);
    transition: background .3s var(--ease);
}
.slider::before {
    content: "";
    position: absolute;
    top: 3px; left: 3px;
    width: 21px; height: 21px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 2px 6px rgba(0,0,0,.18);
    transition: transform .3s var(--ease-out-back);
}
.switch input:checked + .slider { background: linear-gradient(135deg, var(--rose), var(--rose-deep)); }
.switch input:checked + .slider::before { transform: translateX(19px); }

.toast {
    position: fixed;
    left: 50%;
    bottom: calc(var(--tabbar-h) + 28px);
    z-index: 300;
    transform: translate(-50%, 16px);
    padding: 10px 20px;
    font-size: .84rem;
    color: #fff;
    background: color-mix(in srgb, var(--ink) 92%, transparent);
    border-radius: 999px;
    box-shadow: var(--shadow-md);
    opacity: 0;
    pointer-events: none;
    transition: opacity .3s, transform .34s var(--ease-out-back);
}
.toast.is-show { opacity: 1; transform: translate(-50%, 0); }

/* 滚动入场 */
.reveal {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
    * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
    .reveal { opacity: 1; transform: none; }
    html { scroll-behavior: auto; }
}