/*
 * invite.css
 */

/* ==================================== */
/* 1. アニメーション定義                 */
/* ==================================== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUpFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(0, 123, 255, 0.4);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(0, 123, 255, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(0, 123, 255, 0);
  }
}

/* ==================================== */
/* 2. CSS カスタムプロパティ (変数)       */
/* ==================================== */
:root {
    --color-primary: #007bff;
    --color-primary-dark: #0056b3;
    --color-primary-accent: #0004ff;
    --color-text-dark: #333;
    --color-text-medium: #555;
    --color-background-light: #f8fbfc;
    --color-white: #ffffff;
    --color-border: #e0e0e0;
    --color-border-light: #f0f0f0;
    --color-dark-blue: #2c3e50;
    --font-family-base: 'Noto Sans JP', 'Hirino Sans', 'Meiryo', sans-serif;
    --font-size-base: 1rem;
    --line-height-base: 1.8;
    --spacing-xs: 0.625rem;
    --spacing-md: 1rem;
    --spacing-xl: 1.5625rem;
    --spacing-xxl: 1.875rem;
    --spacing-xxxl: 2.5rem;
    --spacing-huge: 3.75rem;
    --shadow-md: 0 5px 15px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 25px rgba(0,0,0,0.12);
    --shadow-header: 0 2px 10px rgba(0,0,0,0.08);
    --border-radius-sm: 5px;
    --border-radius-lg: 12px;
    --transition-speed: 0.3s;
    --transition-timing: ease-in-out;
}

/* ==================================== */
/* 3. 基本設定                          */
/* ==================================== */
*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font-family-base);
    background-color: var(--color-background-light);
    color: var(--color-text-dark);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden;
    animation: fadeIn 0.8s var(--transition-timing);
    cursor: none;
}

a, button {
    cursor: none;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-speed);
}
a:hover { color: var(--color-primary-dark); }

/* ==================================== */
/* 4. ヘッダー                          */
/* ==================================== */
.site-header {
    background-color: var(--color-white);
    padding: 1.2rem 0;
    box-shadow: var(--shadow-header);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
    transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}
.site-header.hide {
    transform: translateY(-100%);
}
.header-content {
    max-width: 75rem;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-xl);
}
.site-title {
    margin: 0;
    font-size: 1.8rem;
    font-weight: 700;
}
.site-title a { color: var(--color-text-dark); }
.site-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}
.site-nav ul li { margin-left: var(--spacing-xxl); }
.site-nav ul li a {
    color: var(--color-text-medium);
    font-weight: 700;
    font-size: 1.1rem;
    padding: 0.5rem 0;
    position: relative;
}
.site-nav ul li a::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    bottom: 0;
    width: calc(100% + var(--spacing-xs));
    height: 3px;
    background-color: var(--color-primary);
    border-radius: 2px;
    transition: transform var(--transition-speed) ease-out;
}
.site-nav ul li a:hover::after {
    transform: translateX(-50%) scaleX(1);
}
.menu-toggle { display: none; }

/* ==================================== */
/* 5. メインコンテンツ                  */
/* ==================================== */
.main-content {
    flex-grow: 1;
    display: grid;
    place-items: center;
    padding: var(--spacing-xxxl) var(--spacing-md);
}
.invite-card {
    width: 100%;
    max-width: 420px;
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xxxl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border-light);
    text-align: center;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}
.invite-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}
.bot-icon {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin-bottom: var(--spacing-xl);
    animation: pulse 2.5s infinite;
}
h1 {
    font-size: 1.8rem;
    margin: 0 0 0.8rem 0;
    white-space: nowrap;
}
p {
    color: var(--color-text-medium);
    margin: 0 0 var(--spacing-xxxl) 0;
}
.button-group {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.button {
    display: inline-block;
    padding: 14px 20px;
    font-size: 1rem;
    font-weight: 700;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    border: 2px solid transparent;
    transition: all 0.2s ease-in-out;
}
.button:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.button-primary {
    background-color: var(--color-primary-accent);
    color: var(--color-white);
}
.button-primary:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}
.button-secondary {
    background-color: var(--color-white);
    color: var(--color-text-dark);
    border-color: var(--color-border);
}
.button-secondary:hover {
    background-color: #fcfcfc;
    border-color: #ccc;
}

/* ==================================== */
/* 6. フッター                          */
/* ==================================== */
.site-footer {
    background-color: var(--color-dark-blue);
    color: var(--color-white);
    padding: var(--spacing-xxxl) 0;
    margin-top: var(--spacing-huge);
}
.footer-content {
    max-width: 75rem;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}
.footer-content p { color: #e0e0e0; margin: 0; }
.footer-links { display: flex; gap: var(--spacing-xl); }
.footer-links a { color: #a0c0e0; }
.footer-links a:hover { color: var(--color-white); text-decoration: underline; }

/* ==================================== */
/* 7. レスポンシブデザイン              */
/* ==================================== */
@media (max-width: 768px) {
    .site-title { font-size: 1.5rem; }
    .menu-toggle {
        display: block;
        font-size: 1.8rem;
        cursor: pointer;
        color: var(--color-text-dark);
    }
    .site-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--color-white);
        box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    }
    .site-nav.nav-open { display: block; }
    .site-nav ul { flex-direction: column; padding: 0; }
    .site-nav ul li { margin: 0; }
    .site-nav ul li a { display: block; padding: 1rem; text-align: center; border-bottom: 1px solid var(--color-border-light); }
    .site-nav ul li a::after { display: none; }
    .main-content { padding: var(--spacing-xxl) var(--spacing-md); }
    .invite-card { padding: var(--spacing-xxl); }
    .site-footer { margin-top: var(--spacing-xxxl); padding: var(--spacing-xxl) 0; }
    .footer-content { flex-direction: column; justify-content: center; gap: 0.8rem; }
}