/* --- 1. BIẾN MÀU SẮC & CẤU HÌNH CHUNG --- */
:root {
    --primary: #1dd1a1;
    --primary-dark: #10ac84;
    --accent: #ff7675;
    --bg-light: #f5f6fa;
    --dark: #2d3436;
    --gray: #888;
    /* Màu sắc theo ảnh mẫu */
    --cyan: #48dbfb;
    --cyan-dark: #0abde3;
    --coral: #ff7675;
    --blue: #74b9ff;
    --pink-bg: #fff5f5;
    --blue-bg: #eaf6ff;
    --shadow: 0 4px 15px rgba(0,0,0,0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Quicksand', sans-serif; }

html { font-size: clamp(14px, 1.5vw, 16px); scroll-behavior: smooth; }
body { background: var(--bg-light); overflow-x: hidden; color: var(--dark); line-height: 1.6; }

.container { padding: 40px 15px; max-width: 1200px; margin: auto; }
.section-title { font-family: 'Dancing Script', cursive; font-size: clamp(2.2rem, 5vw, 3rem); text-align: center; margin-bottom: 30px; color: var(--dark); }

/* --- 2. THANH ĐIỀU HƯỚNG (NAV) --- */
nav { background: white; padding: 12px 5%; position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 15px rgba(0,0,0,0.05); }
.nav-container { display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: auto; }
.logo { font-family: 'Dancing Script', cursive; font-size: clamp(1.8rem, 4vw, 2.2rem); font-weight: bold; color: var(--primary-dark); text-decoration: none; }

.nav-links { display: flex; gap: clamp(15px, 3vw, 30px); list-style: none; align-items: center; }
.nav-links a { text-decoration: none; color: var(--dark); font-size: 0.95rem; font-weight: 700; transition: var(--transition); }
.nav-links a:hover { color: var(--primary); }

@media (max-width: 768px) {
    .nav-container { flex-direction: column; gap: 10px; }
    .nav-links { gap: 15px; }
}

/* --- 3. NÚT BẤM (BUTTONS) & HIỆU ỨNG --- */
button { border: none; padding: 10px 22px; border-radius: 25px; font-weight: 700; cursor: pointer; transition: var(--transition); outline: none; }
button:active { transform: scale(0.95); }

.btn-auth { background: var(--primary); color: white; box-shadow: 0 4px 10px rgba(29, 209, 161, 0.3); }
.btn-auth:hover { background: var(--primary-dark); transform: translateY(-2px); }

.btn-action { 
    display: block; width: 100%; padding: 14px; 
    background: var(--primary); color: white; 
    border-radius: 15px; font-size: 1rem; margin-top: 10px;
    box-shadow: 0 4px 12px rgba(29, 209, 161, 0.2);
}
.btn-action:hover { background: var(--primary-dark); }

.btn-secondary { background: #eee; color: var(--dark); margin-top: 8px; }
.btn-secondary:hover { background: #ddd; }

/* --- 4. HERO SECTION --- */
.hero-content { 
    background: linear-gradient(135deg, #1dd1a1, #54a0ff); color: white; 
    text-align: center; padding: 80px 20px; border-radius: 0 0 50px 50px; 
    margin-bottom: 40px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); 
}
.hero-content h1 { font-family: 'Dancing Script', cursive; font-size: clamp(2.5rem, 6vw, 4rem); margin-bottom: 10px; }
.hero-content p { font-style: italic; opacity: 0.9; font-size: 1.1rem; }

/* --- 5. GRID HỆ THỐNG --- */
/* Cập nhật: Ép buộc 1 hàng 3 thẻ cho danh sách thành viên */
#member-container, .grid-members { 
    display: grid; 
    grid-template-columns: repeat(3, 1fr); 
    gap: 12px; 
    padding: 10px;
}

/* Giữ nguyên khoảnh khắc hiển thị linh hoạt */
.grid-moments { 
    display: grid; 
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); 
    gap: 20px; 
}

.member-card, .moment-card { 
    background: white; border-radius: 20px; overflow: hidden; 
    box-shadow: 0 4px 10px rgba(0,0,0,0.04); transition: var(--transition); cursor: pointer; 
    position: relative;
}
.member-card:hover { transform: translateY(-8px); box-shadow: 0 12px 25px rgba(0,0,0,0.12); }

.member-card img, .moment-card img { width: 100%; aspect-ratio: 1/1; object-fit: cover; display: block; }
.member-name-plate { padding: 12px 5px; text-align: center; font-weight: 700; font-size: 0.85rem; background: #fff; }

.placeholder-avatar { 
    width: 100%; aspect-ratio: 1/1; background: linear-gradient(135deg, #74b9ff, #a29bfe); 
    display: flex; align-items: center; justify-content: center; 
    color: white; font-size: 2.2rem; font-family: 'Dancing Script', cursive; 
}

/* --- 6. MODAL & CHỈNH SỬA --- */
.modal { 
    position: fixed; inset: 0; background: rgba(0,0,0,0.6); 
    display: none; align-items: center; justify-content: center; 
    z-index: 2000; padding: 20px; backdrop-filter: blur(6px); 
}
.modal-box { 
    background: white; padding: 30px; border-radius: 30px; 
    width: 100%; max-width: 420px; position: relative; 
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
    animation: modalPop 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); 
}

@keyframes modalPop { 
    from { transform: scale(0.8); opacity: 0; } 
    to { transform: scale(1); opacity: 1; } 
}

.close-btn { position: absolute; top: 15px; right: 20px; font-size: 28px; cursor: pointer; color: #bbb; transition: 0.2s; }
.close-btn:hover { color: var(--accent); }

/* --- 7. CHI TIẾT THÀNH VIÊN --- */
.modal-avatar-wrapper { text-align: center; margin-bottom: 20px; }
.modal-avatar-wrapper img, .modal-avatar-wrapper .placeholder-avatar {
    width: 120px; height: 120px; border-radius: 25px; margin: auto;
    object-fit: cover; border: 4px solid #fff; box-shadow: var(--shadow);
}

.member-title-info { text-align: center; margin-bottom: 20px; }
.member-title-info h2 { font-size: 1.5rem; color: var(--dark); }
.member-title-info span { color: var(--primary-dark); font-weight: 600; font-size: 0.9rem; }

.info-group { display: flex; align-items: center; gap: 15px; padding: 15px; border-radius: 18px; margin-bottom: 12px; }
.hobbies-group { background: var(--pink-bg); }
.message-group { background: var(--blue-bg); border-left: 5px solid var(--blue); }

.info-text strong { font-size: 0.7rem; color: var(--gray); text-transform: uppercase; display: block; letter-spacing: 1px; }
.info-text p { font-size: 0.95rem; color: var(--dark); font-weight: 600; }

/* --- 8. NHẠC & PLAYLIST --- */
.music-player-box { background: #fff; padding: 20px; border-radius: 25px; }
.now-playing-info { display: flex; flex-direction: column; align-items: center; gap: 10px; margin-bottom: 20px; }

.track-circle { 
    width: 60px; height: 60px; border-radius: 50%; 
    display: flex; align-items: center; justify-content: center; 
    color: white; font-weight: 800; font-size: 1.5rem;
}
.circle-cyan { background: var(--cyan); border: 4px solid #fff; box-shadow: 0 0 0 3px var(--cyan); }
.circle-coral { background: var(--coral); border: 4px solid #fff; box-shadow: 0 0 0 3px var(--coral); }
.circle-blue { background: var(--blue); border: 4px solid #fff; box-shadow: 0 0 0 3px var(--blue); }

.music-controls { display: flex; justify-content: center; gap: 25px; font-size: 1.2rem; margin: 15px 0; color: var(--dark); }
.music-controls i { cursor: pointer; transition: 0.2s; }
.music-controls i:hover { color: var(--primary); transform: scale(1.2); }

.playlist-scroll { max-height: 200px; overflow-y: auto; margin-top: 15px; padding-right: 5px; }
.music-item { 
    display: flex; align-items: center; gap: 15px; padding: 10px; 
    border-radius: 15px; cursor: pointer; transition: 0.2s; margin-bottom: 8px;
    background: #f9f9f9;
}
.music-item:hover { background: #f0f0f0; transform: translateX(5px); }

/* --- 9. EDIT MODE INPUTS --- */
.edit-label { font-size: 0.8rem; font-weight: 700; color: var(--gray); margin-left: 5px; }
.edit-input { 
    width: 100%; padding: 12px 15px; margin-bottom: 15px; 
    border: 2px solid #f0f0f0; border-radius: 12px; 
    background: #fdfdfd; outline: none; font-size: 0.95rem; transition: 0.3s;
}
.edit-input:focus { border-color: var(--primary); background: #fff; box-shadow: 0 0 10px rgba(29, 209, 161, 0.1); }

/* --- 10. KHOẢNH KHẮC & ZOOM --- */
.zoom-img-container { width: 100%; border-radius: 20px; overflow: hidden; margin-bottom: 15px; }
.zoom-img-container img { width: 100%; display: block; }

.reaction-bar { 
    display: flex; justify-content: space-around; 
    padding: 12px; background: #f8f9fa; border-radius: 30px; 
    margin-top: 15px;
}
.react-item { font-size: 1.8rem; cursor: pointer; transition: 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275); }
.react-item:hover { transform: scale(1.4) translateY(-8px); }

.stats-bar { text-align: center; font-size: 0.85rem; font-weight: 700; color: var(--gray); margin-top: 10px; }

/* --- 11. TOAST NOTIFICATION --- */
/* Cập nhật: Màu nền trắng, chữ tối, bo góc và đổ bóng sang trọng */
.toast {
    visibility: hidden;
    min-width: 250px;
    background-color: #ffffff; 
    color: #333; 
    text-align: center;
    border-radius: 12px; 
    padding: 16px;
    position: fixed;
    z-index: 9999;
    left: 50%;
    bottom: 30px;
    transform: translateX(-50%);
    font-size: 15px;
    box-shadow: 0px 8px 24px rgba(0, 0, 0, 0.15); 
    font-weight: 500;
    opacity: 0;
    transition: opacity 0.4s, bottom 0.4s;
}

.toast.show {
    visibility: visible;
    opacity: 1;
    bottom: 50px;
}

/* --- 12. THANH CUỘN (SCROLLBAR) --- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #ddd; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #ccc; }

/* --- 13. LOGIN MASK --- */
.login-mask {
    position: fixed; inset: 0; background: white; z-index: 5000;
    display: none; flex-direction: column; align-items: center; justify-content: center;
    padding: 20px;
}
.login-box { width: 100%; max-width: 350px; text-align: center; }
.login-box h2 { font-family: 'Dancing Script', cursive; font-size: 2.5rem; margin-bottom: 30px; color: var(--primary-dark); }