/* ===============================================
   ALBERT'S HOMEPAGE - MAIN STYLESHEET V3 (ELEGANT BLUE + PHOTO BG)
   CLEAN VERSION (Education & Notes REMOVED)
   ===============================================
   1. IMPORTS
   2. CSS VARIABLES (THEME)
   3. BASE & RESET
   4. REUSABLE COMPONENTS
   5. MODAL
   =============================================== */

/* ===============================================
   1. IMPORTS
   =============================================== */

/* 组件级样式（都在 assets/css/components/ 下面） */
/* 1. IMPORTS */

@import url('components/_header.css');
@import url('components/_hero.css');
@import url('components/_about.css');
@import url('components/_projects.css');
@import url('components/_socials.css');
@import url('components/_skills.css');
@import url('components/_contact.css');
@import url('components/_footer.css');
@import url('components/_internships.css');
@import url('components/_project-detail.css');

/* 这两行现在要改成这样 ↓ */
@import url('components/education.css');
@import url('components/notes.css');



/* ===============================================
   2. CSS VARIABLES (NEW ELEGANT BLUE THEME)
   =============================================== */
:root {
    /* 直接复制 dark 的变量进来 */
    --primary-color: #56aeff;
    --primary-color-alt: #80bfff;
    --highlight-color: #007bff;
    --title-color: #f8f9fa;
    --text-color: #adb5bd;
    --text-color-light: #6c757d;
    --body-bg-color: #121212;
    --container-bg-color: rgba(23, 29, 41, 0.8);
    --border-color: #343a40;
    --box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    --bg-overlay-color: rgba(0, 0, 0, 0.6);
    
}


/* ===============================================
   3. BASE & RESET STYLES
   =============================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--normal-font-size);
    background-color: var(--body-bg-color);
    color: var(--text-color);
    line-height: 1.6;
    padding-top: var(--header-height);
    transition: background-color 0.3s, color 0.3s;

    background-image: url('../images/background.jpg');
    background-size: cover;
    background-position: center center;
    background-attachment: fixed;
    position: relative;
    z-index: 0;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: var(--bg-overlay-color);
    z-index: -1;
    transition: var(--transition);
}

h1, h2, h3 {
    color: var(--title-color);
    font-weight: 700;
}

ul { list-style: none; }

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

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

/* ===============================================
   4. REUSABLE COMPONENTS & UTILITIES
   =============================================== */
.section {
    padding: var(--section-padding);
}

.section__title {
    font-size: var(--h2-font-size);
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}
.section__title::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

.container {
    max-width: 1120px;
    margin-inline: auto;
    padding-inline: 1.5rem;
}

.grid {
    display: grid;
    gap: 1.5rem;
}

.button {
    display: inline-block;
    background: var(--primary-color);
    color: #fff;
    padding: 0.9rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    border: 2px solid transparent;
    transition: var(--transition);
    cursor: pointer;
}
.button:hover {
    background: var(--primary-color-alt);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.button--ghost {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}
.button--ghost:hover {
    background: var(--primary-color);
    color: #fff;
}

/* ===============================================
   5. MODAL STYLES
   =============================================== */
.modal {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}
.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal__content {
    background-color: var(--container-bg-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    position: relative;
    transform: scale(0.9);
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}
.modal.active .modal__content {
    transform: scale(1);
}

.modal__content h3 {
    margin-bottom: 1rem;
    font-size: var(--h3-font-size);
}

.modal__content img {
    max-width: 250px;
    margin-bottom: 1rem;
}

.modal__close {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 1.5rem;
    color: var(--text-color-light);
    cursor: pointer;
}


/* === 全局 Section 间距加大，使排版更呼吸 === */
.section {
    padding-top: 6rem;
    padding-bottom: 6rem;
}