/* Biến nội bộ */
.date-neo-wrapper {
    --bg-white: #ffffff;
    --border-ink: 3px solid #111111;
    --shadow-solid: 6px 6px 0px #111111;
    --shadow-push: 2px 2px 0px #111111;
    
    /* Bảng màu rực rỡ Neo-brutalism */
    --clr-main: #ff9f1c;     /* Cam cam */
    --clr-accent: #2ec4b6;   /* Xanh ngọc */
    --clr-detail: #ffbf69;   /* Vàng nhạt */
    --clr-work: #cbf3f0;     /* Xanh mint */
    --clr-weekend: #ffcbf2;  /* Hồng phấn */
    --clr-bg: #f8f9fa;

    max-width: 800px;
    margin: 0 auto;
    font-family: system-ui, -apple-system, sans-serif;
    color: #111111;
    background: var(--clr-bg);
    padding: 25px;
    border: var(--border-ink);
    border-radius: 16px;
    box-shadow: 10px 10px 0px #111;
}

.date-neo-wrapper * { box-sizing: border-box; }

.date-neo-header { background: var(--clr-main); color: #111; border: var(--border-ink); box-shadow: var(--shadow-solid); padding: 20px; border-radius: 12px; text-align: center; margin-bottom: 25px; }
.date-neo-header h2 { margin: 0 0 10px 0; font-size: 1.8rem; font-weight: 900; text-transform: uppercase;}
.date-neo-header p { margin: 0; font-weight: 800; font-size: 0.95rem; }

.date-neo-form { display: flex; flex-direction: column; gap: 20px; }
.date-form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 25px; }
.date-group { display: flex; flex-direction: column; gap: 8px; }
.date-group label { font-weight: 900; font-size: 1.05rem; color: #111; text-transform: uppercase;}

/* Input Date Neo-Brutalism */
.neo-input-date { 
    width: 100%; 
    padding: 15px 20px; 
    font-size: 1.4rem; 
    font-weight: 900; 
    font-family: monospace, system-ui;
    color: #111; 
    border: var(--border-ink); 
    border-radius: 12px; 
    background: #fff; 
    box-shadow: 4px 4px 0px #111; 
    outline: none; 
    cursor: pointer;
    transition: all 0.1s;
}
.neo-input-date:focus { background: #e0fbfc; transform: translate(-2px, -2px); box-shadow: 6px 6px 0px #111;}

/* Quick Tags */
.quick-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.q-tag { padding: 6px 12px; border: 2px solid #111; border-radius: 20px; font-size: 0.85rem; font-weight: 800; cursor: pointer; background: #fff; box-shadow: 2px 2px 0px #111; color: #111; transition: transform 0.1s;}
.q-tag:hover { background: var(--clr-accent); color: #fff;}
.q-tag:active { box-shadow: 0px 0px 0px #111; transform: translate(2px,2px); }

/* Nút Submit */
.date-neo-btn { padding: 18px; font-size: 1.2rem; font-weight: 900; background: #111; color: #fff; border: var(--border-ink); border-radius: 12px; box-shadow: 5px 5px 0px var(--clr-accent); cursor: pointer; text-transform: uppercase; transition: all 0.1s; margin-top: 10px; letter-spacing: 1px;}
.date-neo-btn:active { box-shadow: 2px 2px 0px var(--clr-accent); transform: translate(3px, 3px); }

/* KẾT QUẢ */
.date-neo-result { margin-top: 30px; padding-top: 25px; border-top: 4px dashed #111; display: flex; flex-direction: column; gap: 20px;}
.date-neo-result.active { display: flex !important; animation: popResult 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }

.total-days-box { background: var(--clr-main); border: var(--border-ink); border-radius: 12px; padding: 25px 15px; text-align: center; box-shadow: var(--shadow-solid);}
.total-days-box h4 { margin: 0 0 10px 0; font-size: 1.2rem; font-weight: 900; text-transform: uppercase;}
.total-days-box .val-text { font-size: 4rem; font-weight: 900; line-height: 1; margin-bottom: 10px;}
.total-days-box .val-text small { font-size: 1.5rem; margin-left: 5px;}
.compare-text { margin: 0; font-weight: 800; font-size: 1.1rem; background: rgba(255,255,255,0.8); display: inline-block; padding: 5px 15px; border-radius: 20px; border: 2px solid #111;}

.date-result-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 15px; }
.date-card { border: var(--border-ink); box-shadow: 4px 4px 0px #111; border-radius: 12px; padding: 20px 15px; text-align: center; display: flex; flex-direction: column; justify-content: center;}
.card-detail { background: var(--clr-detail); grid-column: span 3;}
.card-work { background: var(--clr-work); grid-column: span 2;}
.card-weekend { background: var(--clr-weekend); }

.date-card h4 { margin: 0 0 10px 0; font-size: 1rem; font-weight: 900; text-transform: uppercase;}
.detail-text { font-size: 1.8rem; font-weight: 900; color: #111;}
.work-val { font-size: 2rem; font-weight: 900; color: #111;}
.weekend-val { font-size: 1.5rem; font-weight: 900; color: #111;}

@keyframes popResult { 0% { opacity: 0; transform: translateY(20px); } 100% { opacity: 1; transform: translateY(0); } }

@media (max-width: 650px) {
    .date-form-grid { grid-template-columns: 1fr; gap: 15px; }
    .date-result-grid { grid-template-columns: 1fr; }
    .card-detail, .card-work, .card-weekend { grid-column: span 1; }
    .total-days-box .val-text { font-size: 3rem; }
}