/*
Theme Name: ESP32Code Modern Tech Theme
Theme URI: https://example.com/esp32-modern-tech
Author: Admin
Description: Giao diện Clean Tech Modern tối giản, chuyên nghiệp dành cho tín đồ ESP32 và IoT, sử dụng tone màu Warm Neutral & Slate, loại bỏ toàn bộ Liquid Glass.
Version: 2.0.0
Text Domain: esp32-modern-tech
*/

:root {
    /* Màu nền (Backgrounds) */
    --bg-main: #F5F3EF;          /* Màu kem nhạt */
    --bg-card: #FFFFFF;          /* Màu trắng */
    --bg-subtle: #EBE8E1;        /* Màu kem trầm */
    --bg-code: #1E242B;          /* Màu xám đen/tối */

    /* Màu chữ (Typography) */
    --text-main: #1A1D20;        /* Màu xám đen chủ đạo */
    --text-muted: #656E7B;       /* Màu xám nhạt/phụ */

    /* Màu nhấn (Accents & Hovers) */
    --accent-primary: #1E293B;   /* Màu xanh xám Slate */
    --accent-hover: #0F172A;     /* Màu xanh xám đậm khi di chuột */
    --accent-gold: #C58B2B;      /* Màu vàng kim */
    --accent-emerald: #059669;   /* Màu xanh ngọc bảo */
    --accent-emerald-hover: #047857; /* Màu xanh ngọc bảo đậm khi di chuột */

    /* Màu đường viền (Borders) */
    --border: #E2DDD5;           /* Màu đường viền sáng */
    --border-dark: #333D47;      /* Màu đường viền tối */

    /* Shadows & Transitions */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

.container {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1200px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* --- NAVIGATION (REFINED SOLID HEADER) --- */
nav {
    position: sticky !important;
    top: 0;
    z-index: 9999;
    width: 100%;
    max-width: 950px;
    margin-top: 20px;
    padding: 8px 24px;
    border-radius: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--accent-gold);
}

nav ul {
    display: flex;
    align-items: center;
    list-style: none;
    flex-grow: 1;
    justify-content: flex-start;
}

nav ul li {
    position: relative;
}

nav ul li a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    display: inline-block;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all var(--transition-fast);
}

nav ul li a:hover {
    color: var(--accent-hover);
    background-color: var(--bg-subtle);
}

/* --- DROPDOWN SUB-MENU --- */
nav ul li .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    padding: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    visibility: hidden;
    opacity: 0;
    transform: translateY(8px);
    transition: all var(--transition-fast);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    list-style: none;
}

nav ul li:hover > .sub-menu {
    visibility: visible;
    opacity: 1;
    transform: translateY(4px);
}

nav ul li .sub-menu li {
    width: 100%;
}

nav ul li .sub-menu li a {
    display: block;
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 14px;
    color: var(--text-main);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    white-space: nowrap;
}

nav ul li .sub-menu li a:hover {
    background-color: var(--bg-subtle);
    color: var(--accent-emerald);
}

/* Featured Shortcut Button */
.header-featured-cat-link {
    margin-left: 10px;
    margin-right: 15px;
    font-size: 13px;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 8px;
    background-color: var(--accent-emerald);
    border: 1px solid var(--accent-emerald);
    color: #FFFFFF;
    text-decoration: none;
    white-space: nowrap;
    transition: background-color var(--transition-fast);
}

.header-featured-cat-link:hover {
    background-color: var(--accent-emerald-hover);
    border-color: var(--accent-emerald-hover);
}

/* Navigation Tools */
.nav-tools {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle-btn, .search-toggle-btn {
    background: var(--bg-subtle);
    border: 1px solid var(--border);
    color: var(--text-main);
    cursor: pointer;
    font-size: 15px;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.theme-toggle-btn:hover, .search-toggle-btn:hover {
    background: var(--accent-primary);
    color: #FFFFFF;
    border-color: var(--accent-primary);
}

.search-overlay-container {
    max-height: 0;
    overflow: hidden;
    width: 100%;
    max-width: 950px;
    transition: max-height 0.4s ease;
}

.search-overlay-container.active {
    max-height: 100px;
    margin-top: 15px;
}

/* --- HERO SECTION --- */
.hero {
    margin-top: 40px;
    width: 100%;
    max-width: 950px;
    padding: 50px 40px;
    border-radius: 20px;
    text-align: center;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-normal);
}

.hero:hover {
    box-shadow: var(--shadow-md);
}

.hero h1 {
    font-size: 48px;
    font-weight: 800;
    color: var(--accent-primary);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.hero p {
    font-size: 18px;
    color: var(--text-muted);
    margin-bottom: 32px;
    line-height: 1.6;
}

.cta-btn {
    display: inline-block;
    background-color: var(--accent-primary);
    color: #FFFFFF;
    padding: 12px 32px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.cta-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

/* --- ESP32 HARDWARE MOCKUP DESIGN --- */
.product-mockup {
    margin-top: 40px;
    width: 240px;
    height: 240px;
    border-radius: 16px;
    margin-left: auto;
    margin-right: auto;
    background-color: var(--bg-code);
    border: 2px solid var(--border-dark);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    transition: border-color var(--transition-normal);
}

.product-mockup::before {
    content: '';
    position: absolute;
    width: 102%;
    height: 75%;
    border-left: 4px dashed var(--accent-gold);
    border-right: 4px dashed var(--accent-gold);
    opacity: 0.8;
}

.hero:hover .product-mockup {
    border-color: var(--accent-gold);
}

.product-mockup span {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 1.5px;
    color: #FFFFFF;
    z-index: 2;
    background: rgba(0, 0, 0, 0.4);
    padding: 6px 12px;
    border-radius: 6px;
}

.core-crystal {
    width: 48px;
    height: 48px;
    background-color: var(--accent-gold);
    border-radius: 8px;
    margin-bottom: 12px;
    z-index: 2;
}

/* --- POSTS SECTION & CARDS --- */
.posts-section {
    width: 100%;
    max-width: 1100px;
    margin-top: 60px;
    padding-bottom: 60px;
    z-index: 2;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.post-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
    display: flex;
    flex-direction: column;
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-gold);
}

.post-thumb {
    width: 100%;
    aspect-ratio: 1 / 1;
    position: relative;
    overflow: hidden;
    background-color: var(--bg-subtle);
}

.post-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.post-card:hover .post-thumb img {
    transform: scale(1.03);
}

.no-thumb {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 0.5px;
    font-size: 14px;
}

.post-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.post-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.4;
}

.post-title a {
    color: var(--text-main);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.post-title a:hover {
    color: var(--accent-emerald);
}

.post-desc {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 16px;
    flex-grow: 1;
}

/* --- MODEL DROPDOWN SELECTOR --- */
.esp-selector {
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.esp-selector label {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.model-dropdown {
    width: 100%;
    padding: 8px 12px;
    border-radius: 6px;
    background-color: var(--bg-main);
    border: 1px solid var(--border);
    color: var(--text-main);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23656E7B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 14px;
    transition: border-color var(--transition-fast);
}

.model-dropdown:hover {
    border-color: var(--accent-primary);
}

.model-dropdown option {
    background-color: var(--bg-card);
    color: var(--text-main);
}

/* Post Card Link wrapper */
.post-card-link {
    text-decoration: none;
    display: block;
}

/* Hardware Badges */
.esp-hardware-tags {
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.hardware-label {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    margin-bottom: 6px;
}

.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.board-badge {
    font-size: 11px;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 4px;
    background-color: var(--bg-subtle);
    border: 1px solid var(--border);
    color: var(--accent-primary);
}

.board-badge.default {
    opacity: 0.6;
}

/* Single Post Content */
.post-detailed-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.entry-content p {
    margin-bottom: 20px;
    line-height: 1.7;
    color: var(--text-main);
}

/* --- PRICE BADGES --- */
.price-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 700;
    z-index: 10;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.price-badge.free {
    background-color: var(--accent-emerald);
    color: #FFFFFF;
}

.price-badge.paid {
    background-color: var(--accent-gold);
    color: #FFFFFF;
}

/* --- RESPONSIVE OPTIMIZATIONS --- */
@media (max-width: 992px) {
    .hero {
        padding: 40px 20px;
        width: 100%;
    }
    .hero h1 {
        font-size: 36px;
    }
    nav {
        max-width: 100%;
        padding: 8px 16px;
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex !important;
        align-items: center;
        justify-content: center;
        background: var(--bg-subtle);
        border: 1px solid var(--border);
        color: var(--text-main);
        font-size: 18px;
        width: 36px;
        height: 36px;
        border-radius: 6px;
        cursor: pointer;
        margin-left: auto;
        margin-right: 10px;
    }

    nav {
        flex-wrap: wrap;
        border-radius: 12px;
    }
    
    nav ul {
        display: none;
        width: 100%;
        flex-direction: column;
        padding-top: 12px;
        margin-top: 12px;
        border-top: 1px solid var(--border);
    }
    
    nav ul.active {
        display: flex;
    }
    
    nav ul li {
        width: 100%;
    }
    
    nav ul li a {
        display: block;
        padding: 10px;
        border-radius: 6px;
    }

    nav ul li .sub-menu {
        position: static;
        visibility: visible;
        opacity: 1;
        transform: none;
        box-shadow: none;
        border: none;
        background-color: var(--bg-subtle);
        border-radius: 6px;
        display: none;
        padding: 4px 0;
        margin-top: 4px;
    }

    nav ul li.active-sub > .sub-menu {
        display: flex;
    }

    .hero {
        margin-top: 20px;
        padding: 24px 16px;
        border-radius: 12px;
    }

    .hero h1 {
        font-size: 28px;
    }

    .hero p {
        font-size: 15px;
        margin-bottom: 20px;
    }

    .product-mockup {
        width: 180px;
        height: 180px;
    }

    .posts-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .header-featured-cat-link {
        display: none;
    }
}