/* File: public/css/style.css */
/* Phiên bản: FULL PRO (Header + Footer + Modern UI) */

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #10b981;
    --success-hover: #059669;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --header-height: 70px;
    --radius: 10px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

/* 1. RESET & GLOBAL */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 0; /* Xóa padding body cũ để Header full màn hình */
    display: flex;
    flex-direction: column;
    min-height: 100vh; /* Đẩy Footer xuống đáy */
}

/* 2. HEADER (ĐẦU TRANG) */
.main-header {
    background-color: #fff;
    height: var(--header-height);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    max-width: 1000px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo-area {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-area a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    margin-left: 25px;
    transition: color 0.2s;
    font-size: 1.3rem;
}

.nav-area a:hover, .nav-area a.active {
    color: var(--primary-color);
}

.nav-area i { margin-right: 5px; }

/* 3. CONTAINER (NỘI DUNG CHÍNH) */
.container.main-content {
    background-color: var(--card-bg);
    max-width: 1000px;
    margin: 40px auto;
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    flex: 1; /* Đẩy footer xuống */
    width: 95%; /* Responsive */
}

.page-title {
    color: var(--text-main);
    font-weight: 800;
    text-align: center;
    margin-bottom: 5px;
    font-size: 2rem;
}
.sub-title {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 30px;
}

hr { border: 0; height: 1px; background: var(--border-color); margin: 2rem 0; }

/* 4. FORM ELEMENTS */
label { font-weight: 600; margin-bottom: 6px; display: block; color: var(--text-main); font-size: 1.3rem; }

input[type="text"], input[type="number"], select, textarea {
    display: block; width: 100%; height: 50px; font-size: 16px;
    padding: 10px 15px; color: var(--text-main); background-color: #fff;
    border: 1px solid var(--border-color); border-radius: var(--radius);
    box-sizing: border-box; font-family: inherit; transition: border 0.2s;
}
textarea { height: 120px; resize: vertical; }
input:focus, select:focus, textarea:focus {
    border-color: var(--primary-color); outline: 0;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* 5. LICENSE BOX */
.license-box {
    /* Sửa lỗi layout: clear float */
    clear: both;
    display: block; 
    
    background: #f0f9ff; 
    border: 2px solid #bae6fd;
    border-radius: var(--radius); 
    padding: 30px; 
    margin: 40px 0;
    display: flex; flex-direction: column; align-items: center;
}
.license-box label { color: #0284c7; font-size: 2rem; font-weight: 800; margin-bottom: 15px;}
.license-box input {
    border-color: #38bdf8; font-family: monospace; font-weight: 700;
    color: #0369a1; font-size: 1.4rem !important; text-align: center; letter-spacing: 2px;
    max-width: 400px; height: 60px;
}
.license-box small { margin-top: 10px; color: #64748b; font-style: italic; }

/* 6. BUTTONS */
button {
    display: flex; align-items: center; justify-content: center; gap: 10px;
    height: 60px; font-size: 1.1rem; font-weight: 700; text-transform: uppercase;
    cursor: pointer; border: none; border-radius: var(--radius);
    transition: all 0.2s; width: 100%; box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.button-primary { background-color: var(--primary-color); color: white; }
.button-primary:hover { background-color: var(--primary-hover); transform: translateY(-2px); }
.button-primary:disabled { background-color: #94a3b8; cursor: not-allowed; transform: none; }

.button-success { background-color: var(--success-color); color: white; margin-top: 20px; }
.button-success:hover { background-color: var(--success-hover); transform: translateY(-2px); }

/* 7. PREVIEW & TABLE */
#previewSection { margin-top: 40px; display: none; }
details.preview-dropdown {
    background: #fff; border: 1px solid var(--border-color);
    border-radius: var(--radius); overflow: hidden;
}
summary {
    padding: 15px 20px; font-weight: 700; cursor: pointer;
    background: #f8fafc; list-style: none; display: flex; justify-content: space-between;
}
summary:hover { background: #f1f5f9; }
summary::after { content: "▼"; color: var(--text-muted); transition: 0.3s; }
details[open] summary::after { transform: rotate(180deg); }

.table-wrapper { overflow: auto; max-height: 500px; border-top: 1px solid var(--border-color); }
table.preview-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 800px; }
table.preview-table th, table.preview-table td {
    padding: 12px 15px; border-bottom: 1px solid var(--border-color); text-align: left; vertical-align: top;
    max-width: 300px; word-wrap: break-word;
}
table.preview-table th { background: #f1f5f9; font-weight: 700; position: sticky; top: 0; }

/* 8. FOOTER (CHÂN TRANG) - MỚI */
.main-footer {
    background-color: #0f172a; /* Xanh đen sang trọng */
    color: #e2e8f0;
    padding: 50px 0;
    margin-top: auto; /* Đẩy xuống đáy */
}

.footer-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
}

.footer-col h3 { color: #fff; font-size: 1.2rem; margin-bottom: 15px; font-weight: 700; }
.footer-col p { color: #94a3b8; font-size: 0.95rem; margin-bottom: 5px; }

.contact-btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 20px;
    transition: 0.2s;
}
.contact-btn.fb { background-color: #1877f2; color: white; }
.contact-btn.fb:hover { background-color: #155eeb; }

.zalo-area {
    display: flex;
    align-items: center;
    gap: 15px;
    background: rgba(255,255,255,0.05);
    padding: 10px;
    border-radius: 8px;
}
.qr-code {
    width: 80px;
    height: 80px;
    border-radius: 4px;
    border: 2px solid #fff;
}

/* MOBILE */
@media (max-width: 768px) {
    .footer-container { flex-direction: column; text-align: center; }
    .zalo-area { flex-direction: column; width: fit-content; margin: 0 auto; }
    .header-inner { padding: 0 15px; }
    .nav-area a { display: none; } /* Ẩn menu trên mobile cho gọn */
    .six.columns { width: 100%; margin-left: 0; }
    .license-box input { width: 100%; }
}