/* ========================================
   登录页面样式 - Landing Auth Page
   ======================================== */

/* 全屏遮罩层 */
.landing-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, var(--color-primary-start) 0%, var(--color-primary-end) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-landing);
    animation: landingFadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 动态背景粒子 */
.landing-bg-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.04) 0%, transparent 60%);
    animation: particlesFloat 20s ease-in-out infinite;
}

/* 登录卡片容器 */
.landing-card {
    position: relative;
    background: var(--glass-bg-light);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl) var(--space-xl);
    max-width: 440px;
    width: 90%;
    box-shadow: var(--shadow-2xl);
    animation: landingCardSlide 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.2s backwards;
    text-align: center;
}

/* Logo 图标 */
.landing-logo {
    font-size: 4rem;
    margin-bottom: var(--space-md);
    animation: logoFloat 3s ease-in-out infinite;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
}

/* 标题 */
.landing-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-black);
    color: var(--text-white);
    margin-bottom: var(--space-sm);
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    letter-spacing: -0.02em;
}

/* 副标题 */
.landing-subtitle {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    color: var(--text-white-secondary);
    margin-bottom: var(--space-xl);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* 登录表单 */
.landing-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.landing-form input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 255, 255, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family-base);
    color: var(--text-white);
    transition: all var(--transition-base);
    backdrop-filter: blur(var(--glass-blur-light));
    -webkit-backdrop-filter: blur(var(--glass-blur-light));
}

.landing-form input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.landing-form input:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.35);
    border-color: rgba(255, 255, 255, 0.7);
    box-shadow:
        0 0 0 3px rgba(255, 255, 255, 0.15),
        0 4px 20px rgba(0, 0, 0, 0.2);
    transform: translateY(-1px);
}

/* 提交按钮 */
.landing-submit {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.85) 100%);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-md);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-start);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow:
        0 4px 16px rgba(0, 0, 0, 0.2),
        inset 0 -2px 6px rgba(0, 0, 0, 0.08);
    position: relative;
    overflow: hidden;
}

.landing-submit::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
    transition: left var(--transition-slow);
}

.landing-submit:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0.95) 100%);
    transform: translateY(-2px);
    box-shadow:
        0 6px 24px rgba(0, 0, 0, 0.25),
        inset 0 -2px 6px rgba(0, 0, 0, 0.08);
}

.landing-submit:hover::before {
    left: 100%;
}

.landing-submit:active {
    transform: translateY(0);
    box-shadow:
        0 2px 8px rgba(0, 0, 0, 0.2),
        inset 0 2px 6px rgba(0, 0, 0, 0.1);
}

/* 页脚链接 */
.landing-footer {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.landing-footer a {
    color: var(--text-white-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
    font-weight: var(--font-weight-medium);
}

.landing-footer a:hover {
    color: var(--text-white);
    text-decoration: underline;
}

/* 加载状态 */
.landing-submit.loading {
    pointer-events: none;
    opacity: 0.7;
}

.landing-submit.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 3px solid var(--color-primary-start);
    border-radius: 50%;
    border-top-color: transparent;
    animation: buttonSpin 0.8s linear infinite;
}

/* ========================================
   响应式适配
   ======================================== */
@media (max-width: 768px) {
    .landing-card {
        padding: var(--space-xl) var(--space-lg);
        max-width: 95%;
    }

    .landing-logo {
        font-size: 3rem;
    }

    .landing-title {
        font-size: var(--font-size-2xl);
    }

    .landing-subtitle {
        font-size: var(--font-size-base);
    }
}

@media (max-width: 480px) {
    .landing-card {
        padding: var(--space-lg) var(--space-md);
    }

    .landing-form input,
    .landing-submit {
        font-size: var(--font-size-sm);
    }
}

/* ========================================
   动画定义
   ======================================== */
@keyframes landingFadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes landingCardSlide {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.95);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes logoFloat {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

@keyframes particlesFloat {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    33% {
        transform: translate(30px, -30px) scale(1.05);
    }

    66% {
        transform: translate(-20px, 20px) scale(0.95);
    }
}

@keyframes buttonSpin {
    to {
        transform: rotate(360deg);
    }
}

/* 淡出动画（登录成功后） */
@keyframes landingFadeOut {
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
        transform: scale(1.05);
    }
}