/* IMPORT FONT QUICKSAND TỪ GOOGLE FONTS */
@import url('https://fonts.googleapis.com/css2?family=Quicksand:wght@300;400;500;600;700&display=swap');

:root {
    /* Hệ màu Hy vọng (Hopeful Palette) */
    --primary-gradient: linear-gradient(135deg, #ec4899 0%, #8b5cf6 50%, #06b6d4 100%);
    --bg-dark: #0f172a;
    --glass: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-heavy: rgba(15, 23, 42, 0.8);
    
    /* Màu chữ chuẩn */
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --brand-pink: #ec4899;
    --brand-blue: #38bdf8;
    
    /* Font chính */
    --font-main: 'Quicksand', sans-serif;
}

/* Reset toàn bộ hệ thống về Font Quicksand */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-main);
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* HIỆU ỨNG KÍNH MỜ (GLASSMORPHISM) TRIỆT ĐỂ */
.glass-panel {
    background: var(--glass);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-panel:hover {
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

/* TYPOGRAPHY CHĂM CHÚT */
h1, h2, h3, h4 {
    font-weight: 700;
    letter-spacing: -0.02em;
}

p {
    font-weight: 500; /* Quicksand hơi mỏng nên dùng 500 để dễ đọc trong y khoa */
}

/* INPUT & FORM ELEMENTS */
.input-glass {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    padding: 14px 18px;
    border-radius: 14px;
    color: #fff;
    font-size: 15px;
    font-weight: 500;
    outline: none;
    transition: 0.3s;
}

.input-glass:focus {
    border-color: var(--brand-pink);
    background: rgba(0, 0, 0, 0.5);
    box-shadow: 0 0 0 4px rgba(236, 72, 153, 0.1);
}

/* BUTTONS */
.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    border: none;
    padding: 14px 28px;
    border-radius: 14px;
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
    transition: 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 10px 25px rgba(236, 72, 153, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

/* CUSTOM SCROLLBAR */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--glass-border); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }