/* ============================================
   01 - CSS Variables & Reset
   ============================================ */
:root {
    /* Colors */
    --primary-blue: rgba(0, 20, 210);
    --primary-blue-light: rgba(0, 40, 230);
    --primary-blue-dark: rgba(0, 15, 180);
    --accent-cyan: rgba(0, 40, 230);

    /* TikTok Colors */
    --tiktok-black: #010101;
    --tiktok-pink: #FE2C55;
    --tiktok-cyan: #25F4EE;

    /* LINE Color */
    --line-green: #00C300;
    --line-green-dark: #00B900;

    /* Text */
    --text-dark: #0F172A;
    --text-gray: #334155;
    --text-light: #64748B;

    /* Backgrounds */
    --bg-white: #FFFFFF;
    --bg-light: #F8FAFC;
    --bg-gray: #E2E8F0;

    /* State */
    --success-green: #10B981;
    --error-red: #EF4444;

    /* Spacing */
    --section-padding: 100px;
    --section-padding-mobile: 60px;
    --container-width: 1280px;
    --container-narrow: 900px;

    /* Typography */
    --font-heading: 'Playfair Display', 'Noto Serif JP', serif;
    --font-body: 'Sora', 'Noto Sans JP', sans-serif;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

    /* Border Radius */
    --radius-sm: 2px;
    --radius-md: 3px;
    --radius-lg: 4px;
    --radius-xl: 6px;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--bg-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* CSS Containment - レンダリング最適化 */
section {
    contain: layout style;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-base);
}

ul {
    list-style: none;
}