/* CSS Reset & Variables for Pinterest Inspired Theme */
:root {
    --bg-color: #0D0D0D;
    --accent-color: #C5A059; /* Bronze/Gold */
    --text-primary: #FFFFFF;
    --text-secondary: #B0B0B0;
    --glass-bg: rgba(13, 13, 13, 0.6);
    --glass-border: rgba(197, 160, 89, 0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, .logo { font-family: 'Playfair Display', serif; font-weight: 700; }

/* Background Image with Dark Gradient Overlay */
.overlay {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
    background-image: linear-gradient(to right, rgba(13, 13, 13, 0.95) 0%, rgba(13, 13, 13, 0.7) 100%), url('https://images.unsplash.com/photo-1600596542815-ffad4c1539a9?q=80&w=2075&auto=format&fit=crop');
    background-size: cover; background-position: center; background-attachment: fixed;
    z-index: -1;
}

/* Main Wrapper for Hero */
.main-wrapper { min-height: 100vh; display: flex; flex-direction: column; padding: 40px 8%; }

/* Header */
header { display: flex; justify-content: space-between; align-items: center; padding-bottom: 20px; border-bottom: 1px solid var(--glass-border); }
.logo { font-size: 1.2rem; color: var(--accent-color); letter-spacing: 1px; }
nav a { color: var(--text-primary); text-decoration: none; font-size: 0.85rem; letter-spacing: 2px; transition: color 0.3s; }
nav a:hover { color: var(--accent-color); }

/* Hero Section */
.hero { flex-grow: 1; display: flex; align-items: center; }
.hero-content { max-width: 700px; }
.headline { font-size: 3.5rem; line-height: 1.1; margin-bottom: 30px; animation: fadeUp 1s ease-out; }
.description { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 20px; max-width: 600px; animation: fadeUp 1s ease-out 0.2s; animation-fill-mode: both; }

.btn-primary { display: inline-block; margin-top: 20px; padding: 15px 40px; background: transparent; color: var(--text-primary); border: 1px solid var(--accent-color); text-decoration: none; font-size: 0.85rem; letter-spacing: 3px; text-transform: uppercase; transition: all 0.3s ease; animation: fadeUp 1s ease-out 0.4s; animation-fill-mode: both; }
.btn-primary:hover { background: var(--accent-color); color: var(--bg-color); }

@keyframes fadeUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }

/* Categories Section */
.categories-section { padding: 100px 8%; background: linear-gradient(to bottom, transparent, var(--bg-color) 20%); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }

/* Glassmorphism Cards */
.card { background: var(--glass-bg); backdrop-filter: blur(15px); -webkit-backdrop-filter: blur(15px); border: 1px solid var(--glass-border); padding: 40px 30px; display: flex; flex-direction: column; transition: transform 0.3s ease, border-color 0.3s ease; }
.card:hover { transform: translateY(-5px); border-color: var(--accent-color); }
.card .icon { font-family: 'Playfair Display', serif; font-size: 2rem; color: var(--accent-color); margin-bottom: 20px; font-style: italic; }
.card h3 { font-size: 1.1rem; letter-spacing: 1px; margin-bottom: 15px; text-transform: uppercase; }
.card p { color: var(--text-secondary); font-size: 0.9rem; flex-grow: 1; margin-bottom: 30px; }
.btn-outline { background: transparent; color: var(--accent-color); border: none; border-bottom: 1px solid var(--accent-color); padding-bottom: 5px; font-family: 'Montserrat', sans-serif; font-size: 0.8rem; letter-spacing: 2px; cursor: pointer; text-align: left; transition: color 0.3s, border-color 0.3s; width: max-content; }
.btn-outline:hover { color: var(--text-primary); border-color: var(--text-primary); }

/* Modal */
.modal { display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; overflow: auto; background-color: rgba(13, 13, 13, 0.9); backdrop-filter: blur(10px); align-items: center; justify-content: center; }
.modal-content { position: relative; max-width: 500px; width: 90%; background: #111; border: 1px solid var(--accent-color); padding: 50px 40px; text-align: center; }
.close-btn { position: absolute; top: 15px; right: 25px; color: var(--text-secondary); font-size: 28px; font-family: sans-serif; cursor: pointer; transition: color 0.2s; }
.close-btn:hover { color: var(--accent-color); }
.modal-title { color: var(--accent-color); font-size: 1.8rem; margin-bottom: 20px; letter-spacing: 2px; }
.modal p { color: var(--text-secondary); margin-bottom: 30px; font-size: 0.95rem; }
.modal .btn-primary { display: inline-block; width: 100%; text-align: center; }
.modal-note { margin-top: 25px; font-size: 0.8rem !important; font-style: italic; color: #555 !important; }

/* Survey Section */
.survey-section { padding: 80px 8%; background: linear-gradient(to bottom, var(--bg-color), rgba(13,13,13,0.95)); }
.survey-container { max-width: 800px; margin: 0 auto; padding: 50px; background: var(--glass-bg); backdrop-filter: blur(15px); -webkit-backdrop-filter: blur(15px); border: 1px solid var(--glass-border); border-radius: 8px; box-shadow: 0 10px 30px rgba(0,0,0,0.5); }
.survey-title { text-align: center; font-size: 2.2rem; color: var(--accent-color); margin-bottom: 15px; letter-spacing: 2px; }
.survey-desc { text-align: center; color: var(--text-secondary); margin-bottom: 40px; font-size: 0.95rem; }

.survey-form { display: flex; flex-direction: column; gap: 30px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.form-group { display: flex; flex-direction: column; gap: 12px; align-items: center; text-align: center; }
.form-group label { font-weight: 600; color: var(--text-primary); letter-spacing: 0.5px; font-size: 1rem; }
.form-group input[type="text"], .form-group input[type="url"], .form-group textarea { width: 100%; padding: 15px 20px; background: rgba(255, 255, 255, 0.05); border: 1px solid rgba(197, 160, 89, 0.3); color: var(--text-primary); font-family: 'Montserrat', sans-serif; transition: all 0.3s; border-radius: 4px; font-size: 1rem; text-align: center; }
.form-group input[type="text"]:focus, .form-group input[type="url"]:focus, .form-group textarea:focus { outline: none; border-color: var(--accent-color); background: rgba(255, 255, 255, 0.1); box-shadow: 0 0 15px rgba(197, 160, 89, 0.15); }
.form-group input::placeholder, .form-group textarea::placeholder { color: rgba(176, 176, 176, 0.4); }
.form-group textarea { 
    resize: vertical; 
    min-height: 80px; 
    text-align: center; 
    /* Kế thừa tất cả styling từ input ở trên */
    width: 100%; 
    padding: 15px 20px; 
    background: rgba(255, 255, 255, 0.05); 
    border: 1px solid rgba(197, 160, 89, 0.3); 
    color: var(--text-primary); 
    font-family: 'Montserrat', sans-serif; 
    transition: all 0.3s; 
    border-radius: 4px; 
    font-size: 1rem; 
}

.other-input { padding: 12px 20px; background: rgba(255, 255, 255, 0.03); border: 1px dashed rgba(197, 160, 89, 0.5); color: var(--text-primary); font-family: 'Montserrat', sans-serif; transition: all 0.3s; border-radius: 4px; font-size: 0.95rem; text-align: center; }
.other-input:focus { outline: none; border-color: var(--accent-color); border-style: solid; background: rgba(255, 255, 255, 0.08); }

.radio-group { display: flex; flex-wrap: wrap; justify-content: center; gap: 15px; margin-top: 5px; }
.radio-label { display: flex; align-items: center; justify-content: center; gap: 10px; color: var(--text-secondary); font-weight: 500 !important; cursor: pointer; transition: all 0.3s; font-size: 0.95rem; background: rgba(255, 255, 255, 0.03); padding: 12px 20px; border-radius: 4px; border: 1px solid rgba(255,255,255,0.05); }
.radio-label:hover { color: var(--text-primary); background: rgba(255, 255, 255, 0.08); border-color: rgba(197, 160, 89, 0.3); }
.radio-label input[type="radio"] { accent-color: var(--accent-color); width: 16px; height: 16px; cursor: pointer; margin: 0; }

.form-submit { width: 100%; margin-top: 20px; cursor: pointer; text-align: center; font-weight: 600; font-size: 1rem; padding: 18px; border-radius: 4px; }

/* Google Forms Container */
.google-form-container {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(197, 160, 89, 0.2);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.google-form-container iframe {
    border: none;
    background: transparent;
}

/* Responsive */
@media (max-width: 768px) { .main-wrapper { padding: 30px 5%; } .headline { font-size: 2.2rem; } .categories-section { padding: 60px 5%; } .survey-section { padding: 60px 5%; } .survey-container { padding: 30px 20px; } .form-row { grid-template-columns: 1fr; gap: 20px; } .radio-group { grid-template-columns: 1fr; } .google-form-container iframe { height: 1000px; } }