/* =========================================================
   鉴权表单 ─ 登录 / 注册 共用
   ========================================================= */

.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 20px;
    position: relative;
    z-index: 1;
}

.auth-card {
    background: var(--paper);
    color: var(--ink-deepest);
    width: 100%;
    max-width: 920px;
    min-height: 580px;
    box-shadow:
        0 30px 80px rgba(0, 0, 0, 0.6),
        0 0 0 1px var(--ink-line);
    display: grid;
    grid-template-columns: 1fr 1fr;
    position: relative;
    animation: authIn 0.8s var(--ease-ink);
}

@keyframes authIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.auth-tabs {
    display: flex;
    border-bottom: 1px solid rgba(var(--cinnabar-rgb), 0.15);
    margin-bottom: 24px;
}

.auth-tab {
    flex: 1;
    padding: 14px 0;
    background: none;
    border: none;
    font-family: 'Noto Serif SC', serif;
    font-size: 14px;
    letter-spacing: 0.4em;
    text-indent: 0.4em;
    color: var(--ink-gray);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color 0.2s var(--ease-ink), border-color 0.2s var(--ease-ink);
}
.auth-tab:hover { color: var(--ink-deepest); }
.auth-tab.active {
    color: var(--cinnabar);
    border-bottom-color: var(--cinnabar);
}

.form-row {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    font-family: 'Noto Serif SC', serif;
    font-size: 11px;
    letter-spacing: 0.4em;
    text-indent: 0.4em;
    color: var(--ink-gray);
    margin-bottom: 6px;
}

.form-input {
    width: 100%;
    padding: 12px 14px;
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(var(--cinnabar-rgb), 0.15);
    border-radius: 0;
    font-family: 'Noto Serif SC', serif;
    font-size: 14px;
    color: var(--ink-deepest);
    outline: none;
    transition: border-color 0.2s var(--ease-ink), background 0.2s var(--ease-ink);
}
.form-input::placeholder { color: var(--ink-light-gray); letter-spacing: 0.05em; }
.form-input:focus { border-color: var(--cinnabar); background: rgba(255, 255, 255, 0.75); }
.form-input.error { border-color: var(--cinnabar); background: rgba(var(--cinnabar-rgb), 0.04); }

.form-hint {
    display: block;
    margin-top: 4px;
    font-family: 'Noto Serif SC', serif;
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--ink-light-gray);
}

.form-button {
    width: 100%;
    padding: 14px;
    background: var(--cinnabar);
    color: var(--paper);
    border: none;
    font-family: 'Noto Serif SC', serif;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.4em;
    text-indent: 0.4em;
    cursor: pointer;
    margin-top: 8px;
    transition: background 0.25s var(--ease-ink), transform 0.15s var(--ease-ink);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}
.form-button:hover { background: var(--cinnabar-deep); }
.form-button:active { transform: translateY(1px); }
.form-button:disabled { background: var(--ink-gray); cursor: not-allowed; }
.form-button .loading-spinner { border-color: rgba(255, 255, 255, 0.3); border-top-color: var(--paper); }

.input-error {
    display: block;
    margin-top: 4px;
    font-family: 'Noto Serif SC', serif;
    font-size: 11px;
    color: var(--cinnabar);
    letter-spacing: 0.05em;
    opacity: 0;
    height: 0;
    overflow: hidden;
    transition: opacity 0.2s var(--ease-ink), height 0.2s var(--ease-ink);
}
.input-error.show { opacity: 1; height: auto; }

.alert-msg {
    padding: 10px 14px;
    margin-bottom: 16px;
    font-family: 'Noto Serif SC', serif;
    font-size: 12px;
    letter-spacing: 0.05em;
    background: rgba(var(--cinnabar-rgb), 0.08);
    border-left: 2px solid var(--cinnabar);
    color: var(--cinnabar-deep);
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: opacity 0.25s var(--ease-ink), max-height 0.25s var(--ease-ink), padding 0.25s var(--ease-ink);
}
.alert-msg.show { opacity: 1; max-height: 100px; padding: 10px 14px; }
.alert-msg.success { background: rgba(93, 119, 82, 0.1); border-left-color: var(--jade); color: var(--jade); }

.page-footer {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid rgba(var(--cinnabar-rgb), 0.1);
    text-align: center;
    font-family: 'Cormorant Garamond', serif;
    font-style: italic;
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--ink-gray);
}