/*
  Source notice / 源码声明
  Author / 作者: 伤感咩吖
  Project / 项目: aurora-fansite
  License / 许可: Custom Proprietary Fan Site License. Unauthorized copying, cloning,
  redistribution, or template reuse is prohibited. / 自定义专有粉丝站许可证。禁止未授权复制、
  克隆、再分发或照搬为模板。
  Disclaimer / 免责声明: Unofficial non-commercial fan site; not affiliated with or endorsed
  by AURORA or related rights holders. / 非官方非商业粉丝站，与 AURORA 或相关权利方无隶属或背书关系。
*/

/* ============================================================
   gate.css — entrance page only
   Author: 伤感咩吖
   ============================================================ */

body { overflow: hidden; }

/* ===== Stage layout ===== */
.stage {
    position: relative;
    z-index: 10;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: clamp(2rem, 6vh, 5rem) clamp(1.25rem, 5vw, 4rem);
    gap: clamp(2rem, 5vh, 3.4rem);
    text-align: center;
    transition: opacity 0.9s var(--ease);
}
.stage.fade-out { opacity: 0; }

/* ===== Eyebrow ===== */
.eyebrow {
    font-family: var(--display);
    font-weight: 200;
    font-size: 0.6rem;
    letter-spacing: 0.55em;
    color: var(--ink-faint);
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    opacity: 0;
    transform: translateY(10px);
    animation: rise 1.4s 0.3s var(--ease) forwards;
}
.eyebrow::before, .eyebrow::after {
    content: '';
    width: 26px; height: 1px;
    background: var(--line-bright);
}

/* ===== Title ===== */
.title-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.4rem;
    opacity: 0;
    transform: translateY(20px);
    animation: rise 1.6s 0.45s var(--ease) forwards;
}
.title {
    font-family: var(--glyph);
    font-size: clamp(1.4rem, 4vw, 2.6rem);
    letter-spacing: 0.32em;
    background: linear-gradient(135deg,
        var(--aurora-a) 0%, var(--aurora-b) 30%,
        var(--aurora-c) 65%, var(--aurora-d) 100%);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: shift 10s ease infinite;
}
.title-reading {
    font-family: var(--serif);
    font-style: italic;
    font-weight: 300;
    font-size: clamp(0.85rem, 1.4vw, 1.05rem);
    letter-spacing: 0.04em;
    color: var(--ink-dim);
}

/* ===== Form ===== */
.form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    opacity: 0;
    transform: translateY(20px);
    animation: rise 1.6s 0.85s var(--ease) forwards;
}
.field {
    position: relative;
    width: clamp(220px, 38vw, 320px);
}
.field input {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--line-bright);
    outline: none;
    padding: 0.85rem 0.5rem 0.65rem;
    font-family: var(--display);
    font-weight: 300;
    font-size: 0.9rem;
    letter-spacing: 0.32em;
    color: var(--ink);
    text-align: center;
    caret-color: var(--aurora-a);
    transition: border-color 0.5s var(--ease);
}
.field input::placeholder {
    color: var(--ink-faint);
    font-weight: 200;
    font-size: 0.7rem;
    letter-spacing: 0.4em;
    text-transform: uppercase;
}
.field-underline {
    position: absolute;
    left: 0; right: 0;
    bottom: 0;
    height: 1px;
    background: linear-gradient(90deg,
        var(--aurora-a), var(--aurora-b),
        var(--aurora-c), var(--aurora-d));
    background-size: 200% 100%;
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.7s var(--ease);
    animation: shift 8s ease infinite;
}
.field:focus-within .field-underline,
.field.has-value .field-underline { transform: scaleX(1); }

.field-hint {
    margin-top: 0.6rem;
    font-family: var(--display);
    font-weight: 200;
    font-size: 0.58rem;
    letter-spacing: 0.45em;
    color: var(--ink-faint);
    text-transform: uppercase;
    transition: opacity 0.4s var(--ease);
}

.submit {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.7rem 1.4rem 0.7rem 1.1rem;
    background: transparent;
    border: 1px solid var(--line-bright);
    border-radius: 999px;
    font-family: var(--display);
    font-weight: 300;
    font-size: 0.66rem;
    letter-spacing: 0.32em;
    color: var(--ink);
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
    isolation: isolate;
    transition: color 0.5s var(--ease), border-color 0.5s var(--ease), opacity 0.4s var(--ease);
}
.submit::before {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(135deg, var(--aurora-a), var(--aurora-c), var(--aurora-d));
    transform: translateX(-101%);
    transition: transform 0.6s var(--ease);
    z-index: -1;
}
.submit:hover { color: #0a0a18; border-color: transparent; }
.submit:hover::before { transform: translateX(0); }
.submit svg { width: 12px; height: 12px; transition: transform 0.4s var(--ease); }
.submit:hover svg { transform: translateX(3px); }
.submit:disabled { opacity: 0.4; pointer-events: none; }

/* ===== Error state ===== */
.error {
    margin-top: 0.4rem;
    font-family: var(--display);
    font-weight: 300;
    font-size: 0.62rem;
    letter-spacing: 0.4em;
    color: rgba(220, 140, 150, 0.85);
    text-transform: uppercase;
    min-height: 1em;
    opacity: 0;
    transition: opacity 0.4s var(--ease);
}
.error.show { opacity: 1; }

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    15% { transform: translateX(-6px); }
    30% { transform: translateX(5px); }
    45% { transform: translateX(-4px); }
    60% { transform: translateX(3px); }
    80% { transform: translateX(-1px); }
}
.field.shake input {
    animation: shake 0.45s var(--ease-soft);
    border-bottom-color: rgba(220, 140, 150, 0.6);
}

/* ===== Countdown ===== */
.countdown-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    opacity: 0;
    transform: translateY(20px);
    animation: rise 1.6s 1.15s var(--ease) forwards;
}
.countdown-label {
    font-family: var(--display);
    font-weight: 200;
    font-size: 0.58rem;
    letter-spacing: 0.5em;
    color: var(--ink-faint);
    text-transform: uppercase;
}
.countdown {
    display: flex;
    align-items: baseline;
    gap: clamp(0.7rem, 2vw, 1.6rem);
    font-feature-settings: 'tnum' 1;
}
.cd-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.45rem;
    min-width: 3.2ch;
    position: relative;
}
.cd-num {
    font-family: var(--serif);
    font-style: italic;
    font-weight: 300;
    font-size: clamp(1.6rem, 3.2vw, 2.4rem);
    line-height: 1;
    color: var(--ink);
    letter-spacing: 0.02em;
}
.cd-label {
    font-family: var(--display);
    font-weight: 200;
    font-size: 0.5rem;
    letter-spacing: 0.4em;
    color: var(--ink-faint);
    text-transform: uppercase;
}
.cd-sep {
    font-family: var(--serif);
    font-style: italic;
    font-weight: 300;
    font-size: clamp(1.2rem, 2.4vw, 1.8rem);
    color: var(--ink-faint);
    transform: translateY(-0.15em);
    opacity: 0.55;
}
.cd-ended {
    font-family: var(--display);
    font-weight: 300;
    font-size: 0.72rem;
    letter-spacing: 0.4em;
    color: var(--aurora-a);
    text-transform: uppercase;
    display: none;
}
.cd-ended.on { display: inline-block; }

/* ===== Foot ===== */
.foot {
    position: absolute;
    bottom: clamp(1.2rem, 3vh, 2rem);
    left: 0; right: 0;
    text-align: center;
    font-family: var(--display);
    font-weight: 200;
    font-size: 0.55rem;
    letter-spacing: 0.45em;
    color: var(--ink-faint);
    text-transform: uppercase;
    opacity: 0;
    animation: rise 1.4s 1.5s var(--ease) forwards;
}
.foot .heart {
    display: inline-block;
    margin: 0 0.6em;
    color: rgba(240, 160, 192, 0.7);
}

@keyframes rise { to { opacity: 1; transform: translateY(0); } }

/* ===== Success wash ===== */
.wash {
    position: fixed; inset: 0;
    z-index: 9000;
    pointer-events: none;
    background: linear-gradient(135deg,
        rgba(168,230,207,0.0) 0%,
        rgba(168,230,207,0.7) 35%,
        rgba(184,169,232,0.7) 55%,
        rgba(240,160,192,0.7) 75%,
        rgba(168,230,207,0.0) 100%);
    background-size: 300% 100%;
    background-position: -150% 50%;
    opacity: 0;
    transition: opacity 0.4s var(--ease), background-position 1.4s var(--ease-soft);
    mix-blend-mode: screen;
}
.wash.on { opacity: 1; background-position: 150% 50%; }

/* ===== Tablet ===== */
@media (max-width: 1024px) {
    .title { font-size: clamp(1.3rem, 3.6vw, 2.2rem); letter-spacing: 0.3em; }
    .field { width: clamp(220px, 50vw, 320px); }
    .cd-num { font-size: clamp(1.5rem, 3vw, 2.2rem); }
    .eyebrow { font-size: 0.56rem; letter-spacing: 0.48em; }
    .eyebrow::before, .eyebrow::after { width: 22px; }
}

/* ===== Low-performance overrides ===== */
html.perf-low .title,
html.perf-low .field-underline,
html.perf-low .submit::before { animation: none !important; }
html.perf-low .wash { transition: opacity 0.3s linear !important; mix-blend-mode: normal; }
html.perf-low .eyebrow,
html.perf-low .title-wrap,
html.perf-low .form,
html.perf-low .countdown-wrap,
html.perf-low .foot {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
}

/* ===== Mobile ===== */
@media (max-width: 640px) {
    .stage { gap: 2rem; padding: 2.5rem 1.25rem 5rem; }
    .title { letter-spacing: 0.28em; }
    .field { width: 78vw; max-width: 320px; }
    .countdown { gap: 0.5rem; }
    .cd-num { font-size: clamp(1.4rem, 7vw, 2rem); }
    .cd-label { font-size: 0.46rem; letter-spacing: 0.32em; }
    .cd-sep { font-size: 1.1rem; }
    .eyebrow { font-size: 0.52rem; letter-spacing: 0.42em; gap: 0.6rem; }
    .eyebrow::before, .eyebrow::after { width: 18px; }
    .submit { font-size: 0.58rem; padding: 0.6rem 1.1rem 0.6rem 0.9rem; }
    .field-hint { font-size: 0.52rem; letter-spacing: 0.4em; }
    .foot { font-size: 0.5rem; letter-spacing: 0.38em; padding: 0 1rem; }
}