@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600&family=Noto+Serif+SC:wght@500;600;700&display=swap');
@import url('tokens.css');

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

body {
    font-family: var(--font-body);
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
    color: var(--color-text-primary);
    background:
        radial-gradient(ellipse 120% 80% at 50% 0%, rgba(74, 102, 112, 0.18) 0%, transparent 55%),
        radial-gradient(ellipse 80% 60% at 100% 100%, rgba(194, 59, 34, 0.1) 0%, transparent 50%),
        linear-gradient(165deg, #0a0908 0%, #1a1814 45%, #12100e 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--space-lg);
    position: relative;
    overflow-x: hidden;
}

/* ── Ink scene (道家山水 + 太极) ── */
.ink-scene {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.ink-scene__taiji {
    position: absolute;
    width: min(520px, 90vw);
    height: min(520px, 90vw);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -55%);
    opacity: 1;
    animation: taiji-breathe 12s ease-in-out infinite;
}

.ink-scene__mountains {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: min(42vh, 320px);
}

.ink-scene__brush {
    position: absolute;
    top: 8%;
    left: 0;
    width: 100%;
    height: 80px;
    opacity: 0.9;
}

.ink-scene__verse {
    position: absolute;
    bottom: 12%;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-display);
    font-size: clamp(0.75rem, 2vw, 0.9rem);
    letter-spacing: 0.35em;
    color: rgba(245, 240, 232, 0.22);
    white-space: nowrap;
    writing-mode: horizontal-tb;
}

@keyframes taiji-breathe {
    0%, 100% { transform: translate(-50%, -55%) scale(1); opacity: 0.85; }
    50% { transform: translate(-50%, -55%) scale(1.04); opacity: 1; }
}

@keyframes mist-drift {
    0%, 100% { opacity: 0.5; transform: translateY(0); }
    50% { opacity: 0.75; transform: translateY(-6px); }
}

/* ── Login layout ── */
.login-page {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 420px;
    display: flex;
    justify-content: center;
}

.login-page__vertical {
    position: absolute;
    left: -2.5rem;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 4.5rem);
    font-weight: 700;
    color: rgba(245, 240, 232, 0.07);
    writing-mode: vertical-rl;
    letter-spacing: 0.2em;
    user-select: none;
}

/* ── Ancient scroll (书卷) — pure CSS, no raster asset ── */
.scroll {
    width: min(380px, 90vw);
    filter: drop-shadow(0 28px 48px rgba(0, 0, 0, 0.5))
            drop-shadow(0 6px 16px rgba(0, 0, 0, 0.3));
}

.scroll:focus-within {
    filter: drop-shadow(0 32px 56px rgba(0, 0, 0, 0.55))
            drop-shadow(0 0 32px rgba(194, 59, 34, 0.05));
}

/* 天杆 / 地杆 */
.scroll__roller {
    display: flex;
    align-items: center;
    gap: 0;
    padding: 0 2px;
    position: relative;
    z-index: 2;
}

.scroll__roller--top {
    margin-bottom: -3px;
}

.scroll__roller--bottom {
    margin-top: -3px;
    opacity: 0.92;
    transform: scale(0.96);
}

.scroll__knob {
    flex-shrink: 0;
    width: 13px;
    height: 26px;
    border-radius: 45% 45% 50% 50%;
    background: linear-gradient(
        165deg,
        #d8d4cc 0%,
        #a8a49a 35%,
        #6e6a62 65%,
        #9a968e 100%
    );
    box-shadow:
        inset 0 1px 2px rgba(255, 255, 255, 0.35),
        0 2px 5px rgba(0, 0, 0, 0.45);
}

.scroll__bar {
    flex: 1;
    height: 16px;
    border-radius: 8px;
    background: linear-gradient(
        180deg,
        #ece8e0 0%,
        #b8b4ac 30%,
        #7a7670 55%,
        #a09c94 80%,
        #c8c4bc 100%
    );
    box-shadow:
        0 2px 6px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

/* 宣纸幅面 */
.scroll__body {
    position: relative;
    min-height: 500px;
    overflow: hidden;
    background-color: #d8d0c4;
    background-image:
        radial-gradient(ellipse 55% 50% at 50% 38%, #faf6ee 0%, transparent 70%),
        radial-gradient(ellipse 100% 90% at 50% 50%, #ebe4d8 20%, #cfc6b8 55%, #8a8074 100%),
        repeating-linear-gradient(
            93deg,
            transparent 0px,
            transparent 3px,
            rgba(26, 24, 20, 0.018) 3px,
            rgba(26, 24, 20, 0.018) 4px
        ),
        repeating-linear-gradient(
            177deg,
            transparent 0px,
            transparent 5px,
            rgba(26, 24, 20, 0.012) 5px,
            rgba(26, 24, 20, 0.012) 6px
        );
    box-shadow:
        inset 0 0 60px rgba(26, 24, 20, 0.28),
        inset 0 0 120px rgba(26, 24, 20, 0.18),
        inset 24px 0 40px rgba(26, 24, 20, 0.12),
        inset -24px 0 40px rgba(26, 24, 20, 0.12);
    clip-path: polygon(
        1% 0%, 99% 0%,
        100% 1%, 99.5% 98%,
        98% 100%, 2% 100%,
        0.5% 98%, 0% 1%
    );
}

/* 水墨晕染边沿 */
.scroll__body::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 45% 30% at 0% 50%, rgba(26, 24, 20, 0.35) 0%, transparent 70%),
        radial-gradient(ellipse 45% 30% at 100% 50%, rgba(26, 24, 20, 0.35) 0%, transparent 70%),
        radial-gradient(ellipse 80% 25% at 50% 100%, rgba(26, 24, 20, 0.4) 0%, transparent 65%),
        radial-gradient(ellipse 60% 20% at 50% 0%, rgba(26, 24, 20, 0.08) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

.scroll__content {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 28px 32px 24px;
    z-index: 1;
    min-height: 500px;
}

/* ── Brand ── */
.login-brand {
    text-align: center;
    margin-bottom: var(--space-md);
    flex-shrink: 0;
}

.login-brand__emblem {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.login-brand__taiji {
    width: 44px;
    height: 44px;
    color: var(--color-ink-deep);
}

.dao-seal {
    width: 38px;
    height: 38px;
    border: 2.5px solid var(--color-cinnabar);
    color: var(--color-cinnabar);
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(-4deg);
    box-shadow: inset 0 0 0 1px rgba(194, 59, 34, 0.3);
}

.dao-seal span {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 700;
    line-height: 1;
}

.login-brand h1 {
    font-family: var(--font-display);
    font-size: clamp(1.65rem, 4.5vw, 2.15rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: 0.1em;
    color: var(--color-ink-deep);
    text-wrap: balance;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.4);
}

.login-brand__tagline {
    margin-top: var(--space-sm);
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-ink-mid);
    letter-spacing: 0.2em;
}

.login-brand__sub {
    margin-top: var(--space-xs);
    font-size: var(--font-size-label);
    color: var(--color-text-secondary);
    letter-spacing: 0.12em;
}

/* ── Form ── */
.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-label);
    font-weight: 500;
    color: var(--color-ink-mid);
    letter-spacing: 0.08em;
}

#authForm {
    display: flex;
    flex-direction: column;
}

.form-group input {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid rgba(61, 56, 48, 0.22);
    border-radius: 2px;
    background: rgba(250, 247, 242, 0.55);
    color: var(--color-text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    outline: none;
    transition:
        border-color var(--duration-fast) var(--ease-out),
        box-shadow var(--duration-fast) var(--ease-out),
        background-color var(--duration-fast) var(--ease-out);
}

.form-group input::placeholder {
    color: var(--color-ink-wash);
}

.form-group input:hover {
    border-color: rgba(61, 56, 48, 0.4);
    background: rgba(250, 247, 242, 0.75);
}

.form-group input:focus {
    border-color: var(--color-ink-mid);
    background: rgba(255, 253, 248, 0.92);
    box-shadow: 0 0 0 2px rgba(26, 24, 20, 0.06);
}

.error-msg {
    min-height: 1.25rem;
    margin-top: var(--space-sm);
    font-size: var(--font-size-label);
    color: var(--color-error);
    text-align: center;
}

.btn-group {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-sm);
}

.btn {
    flex: 1;
    min-height: 44px;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    cursor: pointer;
    transition:
        background-color var(--duration-fast) var(--ease-out),
        color var(--duration-fast) var(--ease-out),
        border-color var(--duration-fast) var(--ease-out),
        transform var(--duration-fast) var(--ease-out),
        box-shadow var(--duration-fast) var(--ease-out);
}

.btn:focus-visible {
    outline: 2px solid var(--color-cinnabar);
    outline-offset: 2px;
}

.btn:active:not(:disabled) {
    transform: scale(0.98);
}

.btn-login {
    background: var(--color-cinnabar);
    color: var(--color-text-on-ink);
    box-shadow: 0 4px 16px rgba(194, 59, 34, 0.35);
}

.btn-login:hover {
    background: var(--color-cinnabar-deep);
    box-shadow: 0 6px 20px rgba(194, 59, 34, 0.45);
}

.btn-register {
    background: transparent;
    color: var(--color-ink-deep);
    border: 1.5px solid var(--color-ink-mid);
    letter-spacing: 0.15em;
}

.btn-register:hover {
    border-color: var(--color-ink-deep);
    background: rgba(26, 24, 20, 0.04);
}

/* ── 八卦装饰点 ── */
.scroll__footer {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: auto;
    padding-top: var(--space-sm);
    flex-shrink: 0;
}

.bagua-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-ink-wash);
    opacity: 0.35;
}

.bagua-dot:nth-child(odd) {
    background: var(--color-ink-deep);
    opacity: 0.5;
}

/* ── Toast ── */
.notification {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    max-width: min(360px, calc(100vw - 32px));
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    background: var(--color-ink-deep);
    color: var(--color-text-on-ink);
    font-size: var(--font-size-label);
    display: none;
    z-index: var(--z-toast);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    border-top: 3px solid var(--color-cinnabar);
}

.notification.success {
    background: var(--color-jade);
    border-top-color: var(--color-gold-mist);
}

.notification.show {
    display: block;
    animation: toast-in var(--duration-normal) var(--ease-out);
}

@keyframes toast-in {
    from {
        transform: translateX(24px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@media (prefers-reduced-motion: reduce) {
    .ink-scene__taiji {
        animation: none;
    }

    .btn,
    .scroll,
    .form-group input {
        transition: none;
    }

    .notification.show {
        animation: none;
    }

    .btn:active:not(:disabled) {
        transform: none;
    }
}

@media (max-width: 520px) {
    .login-page__vertical,
    .ink-scene__verse {
        display: none;
    }

    .scroll__content {
        padding: 20px 22px 18px;
        min-height: 460px;
    }

    .scroll__body {
        min-height: 460px;
    }

    .login-brand h1 {
        letter-spacing: 0.06em;
    }

    .login-brand__tagline {
        letter-spacing: 0.15em;
        font-size: 0.9rem;
    }

    .btn-group {
        flex-direction: column;
    }

    .login-brand__emblem {
        gap: var(--space-sm);
    }
}