/* KnowledgeFlow 共通スタイル */
:root {
    /* ブランドカラー - 明るいブルー基調 */
    --primary-blue: #007cff;
    --primary-blue-dark: #0066cc;
    --primary-blue-light: #4b9cfb;
    --primary-gradient: linear-gradient(135deg, #007cff 0%, #4b9cfb 100%);
    --secondary-gradient: linear-gradient(135deg, #4b9cfb 0%, #80b3ff 100%);
    --accent-gradient: linear-gradient(135deg, #0066cc 0%, #007cff 100%);
    --dark-gradient: linear-gradient(135deg, #333333 0%, #1a1a1a 100%);

    /* テキストカラー - 高コントラスト */
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    --text-muted: #aaaaaa;
    --text-white: #ffffff;

    /* 背景カラー - 明るく清潔 */
    --bg-white: #ffffff;
    --bg-light: #f5f5f5;
    --bg-lighter: #fafafa;

    /* ボーダー＆シャドウ */
    --border-light: #e0e0e0;
    --border-medium: #cccccc;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.06);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.08);
    --shadow-xl: 0 12px 24px rgba(0,0,0,0.1);

    /* フォント */
    --font-japanese: 'Noto Sans JP', sans-serif;
    --font-ui: 'Inter', sans-serif;

    /* 背景ガラス効果 */
    --bg-glass: rgba(255, 255, 255, 0.12);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);

    /* Fluid Typography - Perfect Scaling Formula */
    --text-2xs: clamp(0.625rem, 0.6rem + 0.125vw, 0.75rem);   /* 10-12px */
    --text-xs: clamp(0.75rem, 0.725rem + 0.125vw, 0.875rem);  /* 12-14px */
    --text-sm: clamp(0.875rem, 0.85rem + 0.125vw, 1rem);      /* 14-16px */
    --text-base: clamp(1rem, 0.975rem + 0.125vw, 1.125rem);   /* 16-18px */
    --text-lg: clamp(1.125rem, 1.1rem + 0.125vw, 1.25rem);    /* 18-20px */
    --text-xl: clamp(1.25rem, 1.2rem + 0.25vw, 1.5rem);       /* 20-24px */
    --text-2xl: clamp(1.5rem, 1.425rem + 0.375vw, 1.875rem);  /* 24-30px */
    --text-3xl: clamp(1.875rem, 1.75rem + 0.625vw, 2.5rem);   /* 30-40px */
    --text-4xl: clamp(2.25rem, 2rem + 1.25vw, 3.5rem);        /* 36-56px */
    --text-5xl: clamp(2.5rem, 2.125rem + 1.875vw, 4.5rem);    /* 40-72px */

    /* Spacing System - Fibonacci Sequence Based */
    --space-px: 1px;
    --space-0-5: clamp(0.125rem, 0.125rem + 0vw, 0.125rem);   /* 2px */
    --space-1: clamp(0.25rem, 0.25rem + 0vw, 0.25rem);        /* 4px */
    --space-1-5: clamp(0.375rem, 0.375rem + 0vw, 0.375rem);   /* 6px */
    --space-2: clamp(0.5rem, 0.475rem + 0.125vw, 0.625rem);   /* 8-10px */
    --space-2-5: clamp(0.625rem, 0.6rem + 0.125vw, 0.75rem);  /* 10-12px */
    --space-3: clamp(0.75rem, 0.725rem + 0.125vw, 0.875rem);  /* 12-14px */
    --space-4: clamp(1rem, 0.975rem + 0.125vw, 1.125rem);     /* 16-18px */
    --space-5: clamp(1.25rem, 1.2rem + 0.25vw, 1.5rem);       /* 20-24px */
    --space-6: clamp(1.5rem, 1.425rem + 0.375vw, 1.875rem);   /* 24-30px */
    --space-7: clamp(1.75rem, 1.675rem + 0.375vw, 2.125rem);  /* 28-34px */
    --space-8: clamp(2rem, 1.9rem + 0.5vw, 2.5rem);           /* 32-40px */
    --space-9: clamp(2.25rem, 2.125rem + 0.625vw, 2.875rem);  /* 36-46px */
    --space-10: clamp(2.5rem, 2.35rem + 0.75vw, 3.25rem);     /* 40-52px */
    --space-12: clamp(3rem, 2.8rem + 1vw, 4rem);              /* 48-64px */
    --space-14: clamp(3.5rem, 3.25rem + 1.25vw, 4.75rem);     /* 56-76px */
    --space-16: clamp(4rem, 3.7rem + 1.5vw, 5.5rem);          /* 64-88px */
    --space-20: clamp(5rem, 4.6rem + 2vw, 7rem);              /* 80-112px */
    --space-24: clamp(6rem, 5.5rem + 2.5vw, 8.5rem);          /* 96-136px */
    --space-28: clamp(7rem, 6.4rem + 3vw, 10rem);             /* 112-160px */
    --space-32: clamp(8rem, 7.3rem + 3.5vw, 11.5rem);         /* 128-184px */
}

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

html {
    overflow-x: hidden;
}

body {
    font-family: var(--font-japanese);
    line-height: 1.6;
    color: var(--text-primary);
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Touch device improvements */
@media (hover: none) and (pointer: coarse) {
    * {
        -webkit-tap-highlight-color: rgba(0, 0, 0, 0.1);
    }

    .nav-links a,
    .cta-button,
    .mobile-menu-links a,
    button {
        min-height: 44px;
        min-width: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-lg);
}

.nav-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
    gap: 20px;
}

.logo {
    font-family: var(--font-ui);
    font-size: 24px;
    font-weight: 800;
    background: var(--primary-gradient);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
    transition: all 0.3s ease;
    white-space: nowrap;
    flex-shrink: 0;
}

.logo:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 20px;
    align-items: center;
    flex-wrap: nowrap;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 13px;
    transition: all 0.3s ease;
    position: relative;
    white-space: nowrap;
}

.nav-links a:hover {
    color: #007cff;
    transform: translateY(-1px);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width 0.4s cubic-bezier(.4,.4,0,1);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-links a.active {
    color: #007cff;
    font-weight: 600;
}

.cta-button {
    background: var(--primary-gradient);
    color: white;
    padding: 12px 28px;
    border-radius: 40px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.4s cubic-bezier(.4,.4,0,1);
    box-shadow: 0 4px 12px rgba(0, 124, 255, 0.25);
    white-space: nowrap;
    flex-shrink: 0;
}

.cta-button:hover {
    transform: translateY(-2px);
    background: linear-gradient(135deg, #0066cc 0%, #4b9cfb 100%);
    box-shadow: 0 8px 20px rgba(0, 124, 255, 0.35);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-primary);
    cursor: pointer;
    padding: 10px;
    min-width: 44px;
    min-height: 44px;
    z-index: 1001;
    position: relative;
    -webkit-tap-highlight-color: transparent;
}

.mobile-menu-btn:active {
    opacity: 0.7;
}

.mobile-menu-btn i {
    pointer-events: none;
}

/* Footer */
.footer {
    background: #0a0a0a;
    color: white;
    padding: 40px 0;
    text-align: center;
    margin-top: 100px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 14px;
}

.footer-links a:hover {
    color: #4b9cfb;
}

.footer-company {
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
    margin-bottom: 15px;
    line-height: 1.6;
}

.footer-content > p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
    margin: 0;
}

/* Responsive Design - Navigation for 7 items */

/* 1440px and below */
@media (max-width: 1440px) {
    .nav-container {
        padding: 0 40px;
    }

    .nav-links {
        gap: 14px;
    }

    .nav-links a {
        font-size: 12px;
    }

    .cta-button {
        padding: 10px 20px;
        font-size: 12px;
    }
}

/* 1280px and below */
@media (max-width: 1280px) {
    .nav-container {
        padding: 0 30px;
    }

    .nav-links {
        gap: 10px;
    }

    .nav-links a {
        font-size: 11px;
    }

    .logo {
        font-size: 20px;
    }

    .cta-button {
        padding: 8px 16px;
        font-size: 11px;
    }
}

/* 1100px and below */
@media (max-width: 1100px) {
    .nav-container {
        padding: 0 20px;
    }

    .nav-links {
        gap: 8px;
    }

    .nav-links a {
        font-size: 10px;
    }

    .logo {
        font-size: 18px;
    }

    .cta-button {
        padding: 7px 14px;
        font-size: 10px;
    }
}

/* 1000px and below - Switch to mobile menu */
@media (max-width: 1000px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .cta-button {
        padding: 8px 16px;
        font-size: 11px;
    }
}

@media (max-width: 768px) {
    .navbar {
        height: 60px;
    }

    .nav-container {
        gap: 10px;
        height: 60px;
        padding: 0 20px;
    }

    .nav-container > .nav-links {
        display: none !important;
        width: 0;
        overflow: hidden;
        margin: 0;
        padding: 0;
    }

    .logo {
        font-size: 20px;
    }

    .cta-button {
        padding: 8px 16px;
        font-size: 12px;
        margin-left: auto;
        margin-right: 10px;
    }

    .mobile-menu-btn {
        margin-left: 0;
    }

    /* Adjust mobile menu position */
    .mobile-menu {
        top: 60px;
    }

    .footer-content {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .navbar {
        height: 56px;
    }

    .nav-container {
        height: 56px;
        padding: 0 10px;
    }

    .logo {
        font-size: 18px;
    }

    .cta-button {
        padding: 6px 12px;
        font-size: 11px;
    }

    .mobile-menu {
        top: 56px;
    }

    .mobile-menu-links a {
        font-size: 14px;
        padding: 8px 0;
    }

    .footer-content {
        padding: 0 10px;
    }

    .footer {
        padding: 60px 0 30px;
    }
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    max-height: calc(100vh - 70px);
    overflow-y: auto;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu-links {
    list-style: none;
    padding: 20px;
}

.mobile-menu-links li {
    margin-bottom: 15px;
}

.mobile-menu-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    display: block;
    padding: 10px 0;
    transition: all 0.3s ease;
}

.mobile-menu-links a:hover {
    color: #007cff;
    padding-left: 10px;
}

.mobile-cta {
    margin: 20px;
    display: block;
    text-align: center;
    background: var(--primary-gradient);
    color: white;
    padding: 15px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
}

/* Tablet and below: 768px */
@media (max-width: 768px) {
    .nav-container {
        height: 60px;
        padding: 0 15px;
    }

    .logo {
        font-size: 18px;
    }

    .cta-button {
        padding: 8px 16px;
        font-size: 12px;
    }

    .mobile-menu {
        top: 60px;
    }

    .footer {
        padding: 50px 0 25px;
        margin-top: 60px;
    }

    .footer-links {
        gap: 20px;
    }

    .footer-links a {
        font-size: 13px;
    }
}

/* Small Mobile: 480px and below */
@media (max-width: 480px) {
    .nav-container {
        height: 56px;
        padding: 0 12px;
    }

    .logo {
        font-size: 16px;
    }

    .cta-button {
        padding: 6px 12px;
        font-size: 11px;
    }

    .mobile-menu {
        top: 56px;
    }

    .mobile-menu-links {
        padding: 15px;
    }

    .mobile-menu-links a {
        font-size: 14px;
        padding: 10px 0;
    }

    .mobile-cta {
        margin: 15px;
        padding: 12px;
        font-size: 14px;
    }

    .footer {
        padding: 40px 0 20px;
        margin-top: 40px;
    }

    .footer-links {
        gap: 15px;
        flex-direction: column;
        align-items: center;
    }

    .footer-links a {
        font-size: 13px;
    }

    .footer-company {
        font-size: 12px;
    }
}

/* Extra Small Mobile: 375px and below */
@media (max-width: 375px) {
    .nav-container {
        height: 52px;
        padding: 0 10px;
    }

    .logo {
        font-size: 15px;
    }

    .cta-button {
        padding: 5px 10px;
        font-size: 10px;
    }

    .mobile-menu {
        top: 52px;
    }

    .mobile-menu-links {
        padding: 12px;
    }

    .mobile-menu-links a {
        font-size: 13px;
        padding: 8px 0;
    }

    .mobile-cta {
        margin: 12px;
        padding: 10px;
        font-size: 13px;
    }

    .footer {
        padding: 30px 0 15px;
    }

    .footer-links a {
        font-size: 12px;
    }

    .footer-company {
        font-size: 11px;
    }
}

/* Ultra Small Mobile: below 320px */
@media (max-width: 320px) {
    .nav-container {
        height: 48px;
        padding: 0 8px;
    }

    .logo {
        font-size: 13px;
    }

    .cta-button {
        padding: 4px 8px;
        font-size: 9px;
    }

    .mobile-menu {
        top: 48px;
    }

    .mobile-menu-links a {
        font-size: 12px;
    }
}