/* Core Variables */
:root {
    --bg-black: #020205;
    --panel-bg: rgba(10, 10, 15, 0.75);
    --cyan: #00f3ff;
    --purple: #bc13fe;
    --magenta: #ff003c;
    --text: #ffffff;
    --text-dim: #a0a0b0;
    --glass-border: rgba(255, 255, 255, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    background-color: var(--bg-black);
    color: var(--text);
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background Animation Fix */
.bg-fx {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1;
    background: radial-gradient(circle at 20% 30%, rgba(0, 243, 255, 0.1), transparent 40%),
                radial-gradient(circle at 80% 70%, rgba(188, 19, 254, 0.1), transparent 40%);
}

.hidden { display: none !important; }

/* Wrapper & Screen Logic - SỬA LỖI MÀN HÌNH TRẮNG */
.app-wrapper {
    position: relative;
    z-index: 10;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.screen {
    width: 100%;
    max-width: 1200px;
    display: none; /* Mặc định ẩn hẳn để không chiếm không gian */
}

.screen.active {
    display: block; /* Chỉ hiện khi active */
}

/* Glassmorphism */
.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

/* Auth Panel */
.auth-panel {
    width: 100%;
    max-width: 420px;
    margin: auto;
    padding: 40px;
    text-align: center;
}

/* Dashboard Layout - SỬA LỖI LAYOUT TRỐNG */
.dashboard-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.dash-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
}

.dash-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 992px) {
    .dash-content { grid-template-columns: 1.5fr 1fr; }
}

.tool-card, .admin-card { padding: 30px; }

/* Typography */
.logo { font-size: 2rem; font-weight: 900; letter-spacing: 3px; text-transform: uppercase; margin-bottom: 20px; }
.glitch { text-shadow: 2px 0 var(--cyan), -2px 0 var(--magenta); }
.accent-cyan { color: var(--cyan); text-shadow: 0 0 10px var(--cyan); }
.accent-purple { color: var(--purple); text-shadow: 0 0 10px var(--purple); }
.card-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 10px; border-left: 4px solid var(--cyan); padding-left: 15px; }

/* Inputs & Forms */
.input-group { margin-bottom: 20px; text-align: left; }
.input-group label { display: block; font-size: 0.7rem; font-weight: 700; color: var(--text-dim); margin-bottom: 8px; letter-spacing: 1px; }
input {
    width: 100%; background: rgba(0,0,0,0.3); border: 1px solid var(--glass-border);
    padding: 12px 16px; border-radius: 8px; color: #fff; outline: none; transition: var(--transition);
}
input:focus { border-color: var(--cyan); box-shadow: 0 0 15px rgba(0, 243, 255, 0.2); }

/* Tabs */
.tabs { display: flex; gap: 10px; margin-bottom: 30px; border-bottom: 1px solid var(--glass-border); }
.tab-btn {
    flex: 1; padding: 12px; background: none; border: none; color: var(--text-dim);
    cursor: pointer; font-weight: 700; transition: var(--transition); border-bottom: 2px solid transparent;
}
.tab-btn.active { color: var(--cyan); border-bottom-color: var(--cyan); }

/* Buttons */
.cyber-btn {
    padding: 12px 24px; border-radius: 6px; font-weight: 800; cursor: pointer;
    transition: var(--transition); text-transform: uppercase; letter-spacing: 1px;
    background: transparent; border: 1px solid var(--cyan); color: var(--cyan);
}
.cyber-btn:hover { background: var(--cyan); color: #000; box-shadow: 0 0 20px var(--cyan); }
.cyber-btn.btn-alt { border-color: var(--purple); color: var(--purple); }
.cyber-btn.btn-alt:hover { background: var(--purple); color: #fff; box-shadow: 0 0 20px var(--purple); }
.cyber-btn.btn-outline { border-color: var(--text-dim); color: var(--text-dim); }
.cyber-btn.btn-outline:hover { border-color: #fff; color: #fff; background: rgba(255,255,255,0.1); }
.btn-sm { padding: 6px 15px; font-size: 0.75rem; }
.w-full { width: 100%; }

/* Modal & Toast */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.85); display: flex; align-items: center; justify-content: center;
    z-index: 9999; backdrop-filter: blur(10px);
}
.modal-content { max-width: 450px; width: 90%; padding: 40px; text-align: center; }
.modal-text { margin: 20px 0; line-height: 1.6; color: var(--text-dim); }

.toast-container { position: fixed; bottom: 20px; right: 20px; z-index: 10000; display: flex; flex-direction: column; gap: 10px; }
.toast { background: #111; border-left: 4px solid var(--cyan); padding: 15px 25px; border-radius: 4px; animation: slideIn 0.3s ease-out; }

/* Animations */
.fade-in { animation: fadeIn 0.6s ease-out forwards; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideIn { from { transform: translateX(100%); } to { transform: translateX(0); } }

/* Badge & Key Box */
.user-badge { background: rgba(0, 243, 255, 0.1); color: var(--cyan); padding: 5px 12px; border-radius: 20px; font-size: 0.8rem; border: 1px solid var(--cyan); margin-right: 15px; }
.key-display-box { margin-top: 20px; background: #000; padding: 15px; border-radius: 8px; border: 1px dashed var(--purple); display: flex; justify-content: space-between; align-items: center; }
.key-display-box code { color: var(--purple); font-weight: bold; letter-spacing: 1px; }
.copy-icon { background: none; border: none; cursor: pointer; font-size: 1.2rem; filter: grayscale(1); transition: 0.2s; }
.copy-icon:hover { filter: grayscale(0); transform: scale(1.1); }