/* =========================================
   全域變數設定與基礎重置 (依據引導式設計顧問規範)
   ========================================= */
:root {
    /* 主要色彩系統 (基於使用者指定色 #FF3E9B) */
    --primary-color: #FF3E9B;
    --primary-light: #FF85BC;    /* 用於 hover 或次要強調 */
    --primary-dark: #D61A70;     /* 用於 active 或深色背景強調 */
    --primary-bg: rgba(255, 62, 155, 0.1); /* 淺色版背景 */

    /* 基礎配色 */
    --bg-color: #0F0F12;         /* 極致深邃黑 */
    --card-bg: #1A1A1F;          /* 稍微淺一點的深灰作為卡片底色 */
    --text-main: #F4F4F9;        /* 主文字色 (近白) */
    --text-muted: #A0A0AB;       /* 次要文字色 (淡灰) */

    /* 語意化色彩 (符合規範 2.1.3) */
    --success: #10B981;
    --error: #EF4444;
    --warning: #F59E0B;

    /* 視覺一致性 (符合規範 2.5) */
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --transition: 0.2s ease;     /* 統一微動畫過渡 */
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

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

body {
    /* 字體設定 (符合規範 2.2) */
    font-family: 'IBM Plex Sans JP', 'Noto Sans TC', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;            /* 內文行高設定 */
    letter-spacing: 0.02em;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* 程式碼字體設定 (符合規範 2.2.3) */
code, pre {
    font-family: 'JetBrains Mono', monospace;
}

/* =========================================
   字級階層設定 (符合規範 2.2.2)
   ========================================= */
h1 { font-size: 3rem; font-weight: 800; line-height: 1.2; }
h2 { font-size: 2.25rem; font-weight: 700; }
h3 { font-size: 1.5rem; font-weight: 600; }
h4 { font-size: 1.25rem; font-weight: 600; }
p { font-size: 1rem; color: var(--text-muted); }
.small-text { font-size: 0.875rem; }

/* =========================================
   響應式設計：手機優先 (符合規範 2.4.1)
   ========================================= */
@media (max-width: 767px) {
    h1 { font-size: 2.25rem; }
    h2 { font-size: 1.75rem; }
    .hero-section { padding: 120px 20px 60px; }
}

/* 平板斷點 (768px) */
@media (min-width: 768px) {
    body { font-size: 1.05rem; }
}

/* 桌面斷點 (1200px) (符合規範 2.4.2) */
@media (min-width: 1200px) {
    h1 { font-size: 4rem; }
    .hero-section { padding: 160px 0; }
}

/* =========================================
   導覽列樣式
   ========================================= */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 15, 18, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    z-index: 1000;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

/* =========================================
   按鈕系統 (符合規範 2.1.2 / 2.5.3)
   ========================================= */
.cta-button, .nav-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
}

/* 主按鈕 (符合規範 2.1.2) */
.cta-button {
    background-color: var(--primary-color);
    color: white;
    font-size: 1.125rem;
    padding: 1rem 2.5rem;
    border-radius: 30px;
    box-shadow: 0 8px 20px rgba(255, 62, 155, 0.3);
}

.cta-button:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(255, 62, 155, 0.4);
}

.cta-button:active {
    background-color: var(--primary-dark);
    transform: translateY(0);
}

/* 次要按鈕 (符合規範 2.1.2) */
.nav-btn {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-color);
}

/* =========================================
   英雄區塊 (Hero Section)
   ========================================= */
.hero-section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 900px;
    padding: 0 20px;
    z-index: 2;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-bg);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(255, 62, 155, 0.2);
}

.gradient-text {
    background: linear-gradient(to right, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    margin: 1.5rem 0 2.5rem;
    font-size: 1.25rem;
}

/* 價格區塊 */
.price-box {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: var(--radius-lg);
    margin: 0 auto 3rem;
    max-width: 440px;
    box-shadow: var(--shadow);
}

.price-amount {
    display: block;
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-main);
    margin: 0.5rem 0;
}

.price-duration {
    color: var(--primary-color);
    font-weight: 600;
}

/* =========================================
   課程特色區塊 (Features)
   ========================================= */
.features-section {
    padding: 100px 5%;
    max-width: 1240px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.glass-panel {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 3rem 2rem;
    border-radius: var(--radius-lg);
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.glass-panel:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
}

.card-icon {
    font-size: 2rem;
    color: var(--primary-color);
    background: var(--primary-bg);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
}

/* =========================================
   講師介紹區塊 (Instructor)
   ========================================= */
.instructor-section {
    padding: 100px 5%;
}

.instructor-card {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 4rem;
    background: var(--card-bg);
    padding: 4rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

@media (max-width: 767px) {
    .instructor-card {
        flex-direction: column;
        padding: 2.5rem;
        text-align: center;
    }
}

.instructor-avatar img {
    width: 240px;
    height: 240px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-color);
    padding: 6px;
}

.instructor-name {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.instructor-badge {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 1.5rem;
    display: block;
    letter-spacing: 1px;
}

/* =========================================
   頁尾 (Footer)
   ========================================= */
footer {
    text-align: center;
    padding: 80px 0 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: 100px;
}

/* =========================================
   動畫特效
   ========================================= */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 背景光暈裝飾 */
.glow-bg {
    position: absolute;
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, var(--primary-bg) 0%, transparent 70%);
    filter: blur(80px);
    z-index: 1;
    pointer-events: none;
}

.glow-1 { top: -10%; left: -10%; }
.glow-2 { bottom: 10%; right: -10%; }