/**
 * MeetSpot Modern UI Components Library
 * 基于 design_tokens.py 的现代化组件系统
 *
 * 特性:
 * - Glassmorphism (毛玻璃效果)
 * - 微交互动画
 * - Toast 通知系统
 * - 骨架屏加载
 * - WCAG AA 可访问性
 */

/* ============================================
 * Toast 通知系统
 * ============================================ */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: var(--z-tooltip, 1070);
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-width: 400px;
}

.toast {
    background: var(--bg-elevated, #FFFFFF);
    border-radius: var(--radius-xl, 16px);
    padding: 16px 20px;
    box-shadow: var(--shadow-2xl, 0 25px 50px -12px rgba(0, 0, 0, 0.25));
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 64px;
    border-left: 4px solid;
    animation: slideInRight 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.toast::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: currentColor;
    animation: toastProgress 5s linear forwards;
}

.toast.toast-success {
    border-left-color: var(--brand-success, #0C8A5D);
}

.toast.toast-error {
    border-left-color: var(--brand-error, #DC2626);
}

.toast.toast-info {
    border-left-color: var(--brand-info, #2563EB);
}

.toast.toast-warning {
    border-left-color: var(--brand-warning, #CA7205);
}

.toast-icon {
    font-size: 24px;
    flex-shrink: 0;
}

.toast-success .toast-icon { color: var(--brand-success, #0C8A5D); }
.toast-error .toast-icon { color: var(--brand-error, #DC2626); }
.toast-info .toast-icon { color: var(--brand-info, #2563EB); }
.toast-warning .toast-icon { color: var(--brand-warning, #CA7205); }

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: var(--font-weight-semibold, 600);
    color: var(--text-primary, #111827);
    margin-bottom: 4px;
    font-size: var(--font-size-base, 1rem);
}

.toast-message {
    font-size: var(--font-size-sm, 0.875rem);
    color: var(--text-secondary, #4B5563);
    line-height: var(--font-leading-normal, 1.5);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-tertiary, #6B7280);
    cursor: pointer;
    padding: 4px;
    font-size: 20px;
    line-height: 1;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.toast-close:hover {
    color: var(--text-primary, #111827);
    transform: rotate(90deg);
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes toastProgress {
    from { width: 100%; }
    to { width: 0%; }
}

/* ============================================
 * 骨架屏加载组件
 * ============================================ */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-tertiary, #F3F4F6) 25%,
        var(--bg-secondary, #F9FAFB) 50%,
        var(--bg-tertiary, #F3F4F6) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md, 8px);
}

.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
}

.skeleton-text:last-child {
    width: 60%;
}

.skeleton-title {
    height: 28px;
    width: 50%;
    margin-bottom: 16px;
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full, 9999px);
}

.skeleton-card {
    padding: 24px;
    background: var(--bg-elevated, #FFFFFF);
    border-radius: var(--radius-xl, 16px);
    box-shadow: var(--shadow-md, 0 4px 6px -1px rgba(0, 0, 0, 0.1));
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* ============================================
 * Glassmorphism 卡片
 * ============================================ */
.glass-card {
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-2xl, 24px);
    box-shadow:
        0 8px 32px 0 rgba(0, 0, 0, 0.08),
        inset 0 1px 0 0 rgba(255, 255, 255, 0.8);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

/* 脉冲波纹效果 - 地标视觉化 */
.glass-card::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: radial-gradient(
        circle,
        var(--brand-secondary, #06D6A0) 0%,
        transparent 70%
    );
    opacity: 0;
    transform: translate(-50%, -50%);
    transition: all 0.6s ease-out;
    z-index: 0;
}

.glass-card:hover::before {
    width: 400px;
    height: 400px;
    opacity: 0.12;
}

/* 确保内容在波纹之上 */
.glass-card > * {
    position: relative;
    z-index: 1;
}

.glass-card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow:
        0 20px 50px 0 rgba(10, 77, 104, 0.25),
        inset 0 1px 0 0 rgba(255, 255, 255, 0.9);
}

.glass-card-dark {
    background: rgba(17, 24, 39, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-inverse, #FFFFFF);
}

/* ============================================
 * 现代化按钮系统
 * ============================================ */
.btn-modern {
    position: relative;
    padding: 14px 32px 14px 28px; /* 右侧留空间给箭头 */
    font-size: var(--font-size-base, 1rem);
    font-weight: var(--font-weight-semibold, 600);
    border-radius: var(--radius-xl, 16px);
    border: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: visible; /* 改为 visible 让箭头可见 */
    min-height: 48px; /* 移动端触摸目标 */
}

/* 箭头指引效果 - 替代涟漪 */
.btn-modern::after {
    content: '→';
    position: absolute;
    right: -35px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.3rem;
    color: var(--brand-accent, #FF6B35);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-modern:hover::after {
    right: -25px;
    opacity: 1;
}

/* Icon 跳跃动画 */
.btn-modern i {
    display: inline-block;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.btn-modern:hover i {
    animation: iconBounce 0.6s ease;
}

@keyframes iconBounce {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(6px); }
}

.btn-modern:active {
    transform: scale(0.98);
}

.btn-modern:focus-visible {
    outline: 2px solid var(--brand-primary, #5563D4);
    outline-offset: 4px;
}

.btn-primary-modern {
    background: var(--brand-gradient, linear-gradient(135deg, #5563D4 0%, #764BA2 100%));
    color: var(--text-inverse, #FFFFFF);
    box-shadow:
        0 4px 14px 0 rgba(85, 99, 212, 0.4),
        inset 0 1px 0 0 rgba(255, 255, 255, 0.2);
}

.btn-primary-modern:hover {
    transform: translateY(-2px);
    box-shadow:
        0 8px 20px 0 rgba(85, 99, 212, 0.5),
        inset 0 1px 0 0 rgba(255, 255, 255, 0.3);
}

.btn-secondary-modern {
    background: var(--bg-elevated, #FFFFFF);
    color: var(--brand-primary, #5563D4);
    border: 2px solid var(--brand-primary, #5563D4);
    box-shadow: var(--shadow-md, 0 4px 6px -1px rgba(0, 0, 0, 0.1));
}

.btn-secondary-modern:hover {
    background: var(--brand-primary, #5563D4);
    color: var(--text-inverse, #FFFFFF);
}

/* ============================================
 * 输入框增强
 * ============================================ */
.input-modern {
    width: 100%;
    padding: 14px 16px 14px 48px;
    font-size: var(--font-size-base, 1rem);
    border: 2px solid var(--border-default, #E5E7EB);
    border-radius: var(--radius-xl, 16px);
    background: var(--bg-elevated, #FFFFFF);
    transition: all 0.3s ease;
    min-height: 48px; /* 移动端触摸目标 */
}

.input-modern:hover {
    border-color: var(--border-medium, #D1D5DB);
}

.input-modern:focus {
    outline: none;
    border-color: var(--brand-primary, #5563D4);
    box-shadow: 0 0 0 4px rgba(85, 99, 212, 0.1);
    transform: translateY(-1px);
}

.input-group {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--brand-primary, #5563D4);
    font-size: 20px;
    pointer-events: none;
    transition: all 0.3s ease;
}

.input-modern:focus ~ .input-icon {
    color: var(--brand-primary-dark, #764BA2);
    transform: translateY(-50%) scale(1.1);
}

/* ============================================
 * 进度指示器
 * ============================================ */
.progress-steps {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 32px 0;
    padding: 0 24px;
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    flex: 1;
    position: relative;
}

.progress-step::after {
    content: '';
    position: absolute;
    top: 20px;
    left: 50%;
    width: 100%;
    height: 2px;
    background: var(--border-default, #E5E7EB);
    z-index: -1;
}

.progress-step:last-child::after {
    display: none;
}

.progress-step-circle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full, 9999px);
    background: var(--bg-secondary, #F9FAFB);
    border: 2px solid var(--border-default, #E5E7EB);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-semibold, 600);
    color: var(--text-tertiary, #6B7280);
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
    background: var(--bg-elevated, #FFFFFF);
}

.progress-step.active .progress-step-circle {
    background: var(--brand-gradient, linear-gradient(135deg, #5563D4 0%, #764BA2 100%));
    border-color: var(--brand-primary, #5563D4);
    color: var(--text-inverse, #FFFFFF);
    box-shadow: 0 0 0 4px rgba(85, 99, 212, 0.2);
}

.progress-step.completed .progress-step-circle {
    background: var(--brand-success, #0C8A5D);
    border-color: var(--brand-success, #0C8A5D);
    color: var(--text-inverse, #FFFFFF);
}

.progress-step.completed::after {
    background: var(--brand-success, #0C8A5D);
}

.progress-step-label {
    font-size: var(--font-size-sm, 0.875rem);
    color: var(--text-secondary, #4B5563);
    text-align: center;
}

.progress-step.active .progress-step-label {
    color: var(--brand-primary, #5563D4);
    font-weight: var(--font-weight-semibold, 600);
}

/* ============================================
 * 空状态设计
 * ============================================ */
.empty-state {
    text-align: center;
    padding: 64px 24px;
}

.empty-state-icon {
    font-size: 80px;
    color: var(--text-tertiary, #6B7280);
    margin-bottom: 24px;
    opacity: 0.6;
}

.empty-state-title {
    font-size: var(--font-size-2xl, 1.5rem);
    font-weight: var(--font-weight-semibold, 600);
    color: var(--text-primary, #111827);
    margin-bottom: 12px;
}

.empty-state-description {
    font-size: var(--font-size-base, 1rem);
    color: var(--text-secondary, #4B5563);
    margin-bottom: 32px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
 * 移动端优化
 * ============================================ */
@media (max-width: 768px) {
    .toast-container {
        right: 16px;
        left: 16px;
        max-width: none;
    }

    .toast {
        padding: 14px 16px;
    }

    .glass-card {
        border-radius: var(--radius-xl, 16px);
    }

    .progress-steps {
        padding: 0 8px;
    }

    .progress-step-label {
        font-size: var(--font-size-xs, 0.75rem);
    }
}

/* ============================================
 * 可访问性增强
 * ============================================ */
@media (prefers-reduced-motion: reduce) {
    .toast,
    .skeleton,
    .btn-modern::before,
    .glass-card,
    .input-modern,
    .progress-step-circle {
        animation: none !important;
        transition: none !important;
    }
}

/* 键盘导航焦点环 */
*:focus-visible {
    outline: 2px solid var(--brand-primary, #5563D4);
    outline-offset: 2px;
    border-radius: var(--radius-sm, 4px);
}

/* 跳转到主内容链接 */
.skip-to-content {
    position: absolute;
    left: -9999px;
    z-index: 999;
    padding: 12px 24px;
    background: var(--brand-primary, #5563D4);
    color: var(--text-inverse, #FFFFFF);
    text-decoration: none;
    border-radius: var(--radius-md, 8px);
}

.skip-to-content:focus {
    left: 16px;
    top: 16px;
}