/* =================================
   ARAKI LAB - BASE STYLES & NAVIGATION
   ================================= */

/* CSS 變量 */
:root {
    --primary-color: #2c3e50;
    --accent-color: #3498db;
    --text-color: #333;
    --text-light: #666;
    --text-lighter: #999;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --bg-lighter: #fcfcfc;
    --border-color: #e9ecef;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 25px rgba(0,0,0,0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

/* 基本重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-lighter);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* =================================
   HEADER & NAVIGATION STYLES
   ================================= */

/* 標題 */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all 0.3s ease;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 clamp(1rem, 3vw, 2rem);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: clamp(70px, 8vh, 80px);
}

.logo {
    display: flex;
    align-items: center;
    gap: clamp(0.5rem, 1vw, 0.75rem);
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
    font-size: clamp(1rem, 1.5vw, 1.1rem);
    transition: all 0.3s ease;
    white-space: nowrap;
    flex-shrink: 0;
}

.logo:hover {
    color: var(--accent-color);
    transform: translateY(-1px);
}

.logo img {
    height: clamp(35px, 5vw, 45px);
    width: auto;
}

.logo-text {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 600;
    font-size: clamp(1.1rem, 1.8vw, 1.3rem);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
    flex-shrink: 0;
}

/* 導航 */
.nav {
    display: flex;
    gap: 0;
    list-style: none;
    align-items: center;
    position: relative;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 25px;
    padding: clamp(6px, 1vw, 8px) clamp(10px, 1.5vw, 12px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease, opacity 0.2s ease, visibility 0.2s ease;
    opacity: 1;
    visibility: visible;
}

.nav-item {
    position: relative;
    z-index: 2;
}

.nav-link {
    display: block;
    padding: clamp(8px, 1.2vw, 10px) clamp(14px, 2vw, 18px);
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: clamp(0.8rem, 1vw, 0.9rem);
    transition: all 0.3s ease;
    white-space: nowrap;
    border-radius: 20px;
    position: relative;
    z-index: 2;
}

.nav-link:hover {
    color: var(--accent-color);
    transform: translateY(-1px);
}

.nav-link.active {
    color: var(--text-color);
    position: relative;
    z-index: 2;
}

/* 导航容器的增强样式 */
.nav {
    position: relative;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 25px;
    padding: 8px 12px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.1),
        0 4px 16px rgba(0, 0, 0, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.3);
    overflow: hidden;
}

/* 导航链接基础样式 */
.nav-link {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: 20px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2;
    min-height: 44px;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
    text-shadow: 0 2px 8px rgba(52, 152, 219, 0.3);
}

.nav-link.active {
    color: var(--primary-color);
    font-weight: 600;
}

.nav-link.active.slider-active {
    color: white;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.nav-slider {
    position: absolute;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 20px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1;
    box-shadow: 
        0 4px 20px rgba(52, 152, 219, 0.4),
        0 2px 8px rgba(52, 152, 219, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    transform: scale(0.9);
    /* 添加轻微的渐变和纹理 */
    background-image: 
        linear-gradient(135deg, var(--primary-color), var(--accent-color)),
        linear-gradient(45deg, rgba(255,255,255,0.1) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(255,255,255,0.1) 25%, transparent 25%);
    background-size: 100% 100%, 20px 20px, 20px 20px;
    /* 添加边框 */
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* 导航链接的文字容器 */
.nav-text {
    position: relative;
    z-index: 2;
    transition: color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
}

/* 增强导航链接的过渡效果 */
.nav-link {
    position: relative;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 20px;
    overflow: hidden;
}

.nav-link:hover {
    transform: translateY(-2px);
}

.nav-link.active .nav-text {
    font-weight: 600;
}

/* 滑块激活时的增强效果 */
.nav-slider:hover {
    box-shadow: 
        0 6px 25px rgba(52, 152, 219, 0.5),
        0 3px 12px rgba(52, 152, 219, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

/* 漢堡選單 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: clamp(3px, 0.5vw, 4px);
    background: none;
    border: none;
    cursor: pointer;
    padding: clamp(6px, 1vw, 8px);
    z-index: 1001;
    transition: all 0.3s ease, opacity 0.2s ease, visibility 0.2s ease;
    position: relative;
    width: clamp(40px, 5vw, 50px);
    height: clamp(30px, 4vw, 35px);
    border-radius: 8px;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
}

.menu-toggle::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(52, 152, 219, 0.1);
    border-radius: 8px;
    transform: scale(0);
    transition: transform 0.3s ease;
}

.menu-toggle:hover::before {
    transform: scale(1);
}

.menu-toggle:hover {
    transform: translateY(-1px);
}

.menu-toggle:hover span {
    background: var(--accent-color);
}

.menu-toggle span {
    width: clamp(20px, 3vw, 25px);
    height: clamp(2px, 0.3vw, 3px);
    background: var(--primary-color);
    transition: all 0.3s ease;
    border-radius: 2px;
}

.menu-toggle.active {
    background: rgba(52, 152, 219, 0.1);
    border-radius: 8px;
}

.menu-toggle.active span {
    background: var(--accent-color);
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(clamp(5px, 0.8vw, 7px)) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(clamp(-5px, -0.8vw, -7px)) rotate(-45deg);
}

/* 移動端導航覆蓋層 */
.nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* 移動端導航選單 */
.mobile-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    z-index: 1000;
    transition: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-30px) scale(0.9);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.1);
    pointer-events: none;
}

.mobile-nav.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.mobile-nav-header {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 clamp(1rem, 3vw, 2rem);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: clamp(70px, 8vh, 80px);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1001;
}

.mobile-nav-close {
    display: none;
}

.mobile-nav-header .menu-toggle {
    display: flex;
    flex-direction: column;
    gap: clamp(3px, 0.5vw, 4px);
    background: none;
    border: none;
    cursor: pointer;
    padding: clamp(6px, 1vw, 8px);
    z-index: 1001;
    transition: all 0.3s ease;
    position: relative;
    width: clamp(40px, 5vw, 50px);
    height: clamp(30px, 4vw, 35px);
    border-radius: 8px;
    align-items: center;
    justify-content: center;
}

.mobile-nav-header .menu-toggle::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(52, 152, 219, 0.1);
    border-radius: 8px;
    transform: scale(0);
    transition: transform 0.3s ease;
}

.mobile-nav-header .menu-toggle:hover::before {
    transform: scale(1);
}

.mobile-nav-header .menu-toggle:hover {
    transform: translateY(-1px);
}

.mobile-nav-header .menu-toggle:hover span {
    background: var(--accent-color);
}

.mobile-nav-header .menu-toggle span {
    width: clamp(20px, 3vw, 25px);
    height: clamp(2px, 0.3vw, 3px);
    background: var(--primary-color);
    transition: all 0.3s ease;
    border-radius: 2px;
}

.mobile-nav-header .menu-toggle.active {
    background: rgba(52, 152, 219, 0.1);
    border-radius: 8px;
}

.mobile-nav-header .menu-toggle.active span {
    background: var(--accent-color);
}

.mobile-nav-header .menu-toggle.active span:nth-child(1) {
    transform: translateY(clamp(5px, 0.8vw, 7px)) rotate(45deg);
}

.mobile-nav-header .menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-nav-header .menu-toggle.active span:nth-child(3) {
    transform: translateY(clamp(-5px, -0.8vw, -7px)) rotate(-45deg);
}

.mobile-nav-logo {
    display: flex;
    align-items: center;
    gap: clamp(0.5rem, 1vw, 0.75rem);
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
    font-size: clamp(1rem, 1.5vw, 1.1rem);
    transition: all 0.3s ease;
    white-space: nowrap;
    flex-shrink: 0;
}

.mobile-nav-logo:hover {
    color: var(--accent-color);
    transform: translateY(-1px);
}

.mobile-nav-logo img {
    height: clamp(35px, 5vw, 45px);
    width: auto;
}

.mobile-nav-logo-text {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 600;
    font-size: clamp(1.1rem, 1.8vw, 1.3rem);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
    flex-shrink: 0;
}

.mobile-nav .nav {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 2rem 0;
    margin: 0 auto;
    max-width: 600px;
    list-style: none;
    background: transparent;
    border: none;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-radius: 0;
}

.mobile-nav .nav-item {
    border-bottom: none;
    margin: 0 2rem 0.5rem 2rem;
    border-radius: 16px;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.mobile-nav.active .nav-item {
    opacity: 1;
    transform: translateY(0);
}

.mobile-nav.active .nav-item:nth-child(1) { transition-delay: 0.1s; }
.mobile-nav.active .nav-item:nth-child(2) { transition-delay: 0.15s; }
.mobile-nav.active .nav-item:nth-child(3) { transition-delay: 0.2s; }
.mobile-nav.active .nav-item:nth-child(4) { transition-delay: 0.25s; }
.mobile-nav.active .nav-item:nth-child(5) { transition-delay: 0.3s; }
.mobile-nav.active .nav-item:nth-child(6) { transition-delay: 0.35s; }
.mobile-nav.active .nav-item:nth-child(7) { transition-delay: 0.4s; }
.mobile-nav.active .nav-item:nth-child(8) { transition-delay: 0.45s; }

.mobile-nav .nav-item:last-child {
    border-bottom: none;
}

.mobile-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 0;
    padding: 20px 24px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 18px;
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    border-radius: 16px;
    position: relative;
    background: rgba(255, 255, 255, 0.6);
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    text-align: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.mobile-nav .nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.6s ease;
}

.mobile-nav .nav-link:hover::before {
    left: 100%;
}

.mobile-nav .nav-link:hover {
    background: rgba(52, 152, 219, 0.15);
    color: var(--accent-color);
    transform: translateY(-3px);
    border-color: rgba(52, 152, 219, 0.4);
    box-shadow: 0 10px 30px rgba(52, 152, 219, 0.2);
}

.mobile-nav .nav-link.active {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    font-weight: 600;
    box-shadow: 0 12px 35px rgba(52, 152, 219, 0.5);
    border-color: transparent;
    transform: translateY(-2px);
}

.mobile-nav .nav-link.active:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(52, 152, 219, 0.6);
}

.mobile-nav-icon {
    display: none;
}

/* =================================
   RESPONSIVE BREAKPOINTS
   ================================= */

/* Desktop */
@media (min-width: 1001px) {
    .nav {
        display: flex !important;
    }
    
    .menu-toggle {
        display: none !important;
        opacity: 0 !important;
        visibility: hidden !important;
    }
    
    .mobile-nav {
        opacity: 0 !important;
        visibility: hidden !important;
        transform: translateY(-30px) scale(0.9) !important;
    }
    
    .mobile-nav.active {
        opacity: 0 !important;
        visibility: hidden !important;
        transform: translateY(-30px) scale(0.9) !important;
    }
    
    .mobile-nav .nav {
        display: flex !important;
        flex-direction: column !important;
    }
}

/* Mobile and Tablet */
@media (max-width: 1000px) {
    .nav {
        display: none !important;
        opacity: 0 !important;
        visibility: hidden !important;
    }
    
    .menu-toggle {
        display: flex !important;
        opacity: 1 !important;
        visibility: visible !important;
    }
    
    .mobile-nav {
        opacity: 0;
        visibility: hidden;
        transform: translateY(-30px) scale(0.9);
    }
    
    .mobile-nav.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0) scale(1);
    }
    
    .mobile-nav .nav {
        display: flex !important;
        flex-direction: column !important;
        opacity: 1 !important;
        visibility: visible !important;
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 0 1rem;
    }
    
    .mobile-nav .nav-link {
        font-size: 16px;
        padding: 18px 20px;
    }
}

@media (max-width: 480px) {
    .header-container {
        height: 70px;
    }
    
    .logo-text {
        font-size: 1rem;
    }
    
    .logo img {
        height: 30px;
    }
    
    .menu-toggle {
        width: 40px;
        height: 30px;
    }
    
    .menu-toggle span {
        width: 20px;
        height: 2px;
    }
    
    .mobile-nav .nav {
        padding: 1rem 0;
    }
    
    .mobile-nav .nav-item {
        margin: 0 1rem 0.5rem 1rem;
    }
    
    .mobile-nav .nav-link {
        font-size: 16px;
        padding: 16px 20px;
    }
}