@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;900&family=JetBrains+Mono:wght@400;700&display=swap');

:root {
    --bg: #0a0f1e;
    --card-bg: #111827;
    --surface: #1a2236;
    --border: #1f2d45;
    --primary: #3b82f6;
    --primary-glow: rgba(59, 130, 246, 0.35);
    --success: #10b981;
    --success-glow: rgba(16, 185, 129, 0.3);
    --error: #ef4444;
    --error-glow: rgba(239, 68, 68, 0.3);
    --warning: #f59e0b;
    --warning-glow: rgba(245, 158, 11, 0.3);
    --text: #f0f6ff;
    --text-dim: #64748b;
    --text-mid: #94a3b8;
    --screen-bg: #070c18;
    --radius: 1rem;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

.pos-container {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 1.5rem;
    box-shadow: 0 40px 80px rgba(0, 0, 0, 0.6);
    width: 420px;
    overflow: hidden;
}

/* ── Header ── */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    background: rgba(255,255,255,0.02);
}

.header-left { display: flex; align-items: center; gap: 0.75rem; }

.brand { display: flex; align-items: center; gap: 0.5rem; }
.brand-icon { font-size: 1.1rem; }
.brand-name { font-size: 0.9rem; font-weight: 700; letter-spacing: 0.02em; color: var(--text); }

.liveness-dot {
    width: 7px; height: 7px; border-radius: 50%;
    transition: all 0.3s;
}
.liveness-dot.online {
    background: var(--success);
    box-shadow: 0 0 8px var(--success);
    animation: pulse 2s infinite;
}
.liveness-dot.offline { background: var(--error); box-shadow: 0 0 6px var(--error); }

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.3); opacity: 0.7; }
}

.status-badge {
    font-size: 0.7rem; font-weight: 700;
    padding: 0.3rem 0.75rem; border-radius: 999px;
    text-transform: uppercase; letter-spacing: 0.05em;
}
.status-badge.connecting { background: var(--surface); color: var(--text-dim); }
.status-badge.connected { background: rgba(16,185,129,0.15); color: var(--success); }
.status-badge.disconnected { background: rgba(239,68,68,0.15); color: var(--error); }

/* ── Main ── */
main { padding: 1.5rem; }

/* ── Display Screen ── */
.display-screen {
    background: var(--screen-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    min-height: 230px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    position: relative;
    overflow: hidden;
    transition: border-color 0.4s, box-shadow 0.4s;
}

.display-screen.waiting {
    border-color: rgba(245,158,11,0.4);
    box-shadow: 0 0 30px rgba(245,158,11,0.1), inset 0 0 40px rgba(245,158,11,0.03);
}
.display-screen.processing {
    border-color: rgba(59,130,246,0.5);
    box-shadow: 0 0 30px rgba(59,130,246,0.15), inset 0 0 40px rgba(59,130,246,0.05);
}
.display-screen.success {
    border-color: rgba(16,185,129,0.5);
    box-shadow: 0 0 30px rgba(16,185,129,0.15), inset 0 0 40px rgba(16,185,129,0.05);
}
.display-screen.error {
    border-color: rgba(239,68,68,0.4);
    box-shadow: 0 0 30px rgba(239,68,68,0.1), inset 0 0 40px rgba(239,68,68,0.03);
}

/* ── State Panels ── */
.state-panel {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem 1.5rem;
    width: 100%;
    gap: 0.5rem;
}
.state-panel.active { display: flex; }

/* Idle */
.idle-icon { font-size: 2.5rem; margin-bottom: 0.5rem; opacity: 0.4; }
.idle-title { font-size: 1.1rem; font-weight: 700; color: var(--text-mid); }
.idle-subtitle { font-size: 0.8rem; color: var(--text-dim); }

/* Active Transaction */
.transaction-info { width: 100%; margin-bottom: 0.5rem; }
.service-label {
    font-size: 0.6rem; font-weight: 800;
    letter-spacing: 0.15em; color: var(--primary);
    margin-bottom: 0.35rem;
    text-transform: uppercase;
}
.service-name {
    font-size: 0.95rem; font-weight: 700;
    color: var(--text); line-height: 1.3;
}

.price-display {
    display: flex; align-items: flex-start; justify-content: center;
    gap: 0.15rem; margin: 1rem 0;
    line-height: 1;
}
.price-currency {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.8rem; font-weight: 700;
    color: var(--text-dim);
    padding-top: 0.35rem;
}
.price-amount {
    font-family: 'JetBrains Mono', monospace;
    font-size: 3.5rem; font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
}

.status-chip {
    font-size: 0.7rem; font-weight: 800;
    padding: 0.3rem 0.9rem; border-radius: 999px;
    text-transform: uppercase; letter-spacing: 0.1em;
    margin-bottom: 0.25rem;
}
.status-chip.waiting { background: rgba(245,158,11,0.15); color: var(--warning); }
.status-chip.processing { background: rgba(59,130,246,0.15); color: var(--primary); }
.status-chip.success { background: rgba(16,185,129,0.15); color: var(--success); }
.status-chip.error { background: rgba(239,68,68,0.15); color: var(--error); }

.status-message { font-size: 0.8rem; color: var(--text-dim); }

/* Result */
.result-icon {
    font-size: 3rem; width: 5rem; height: 5rem;
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    margin-bottom: 1rem;
    font-style: normal;
}
.result-icon.success { background: rgba(16,185,129,0.15); color: var(--success); box-shadow: 0 0 25px rgba(16,185,129,0.2); }
.result-icon.error { background: rgba(239,68,68,0.15); color: var(--error); box-shadow: 0 0 25px rgba(239,68,68,0.2); }

.result-title { font-size: 1.2rem; font-weight: 800; margin-bottom: 0.5rem; }
.result-tx { font-family: 'JetBrains Mono', monospace; font-size: 0.7rem; color: var(--text-dim); }

/* ── Controls ── */
.controls { display: flex; flex-direction: column; gap: 0.75rem; }

button {
    display: flex; align-items: center; justify-content: center;
    gap: 0.6rem; padding: 0.9rem 1rem;
    border-radius: 0.75rem; border: none;
    font-size: 0.9rem; font-weight: 700;
    cursor: pointer; transition: all 0.2s;
    font-family: 'Inter', sans-serif;
}

.btn-icon { font-size: 1rem; }

.primary-btn { background: var(--primary); color: white; }
.primary-btn:hover:not(:disabled) {
    background: #2563eb;
    box-shadow: 0 4px 20px var(--primary-glow);
    transform: translateY(-1px);
}
.primary-btn:disabled { opacity: 0.35; cursor: not-allowed; }

.secondary-btn { background: var(--surface); color: var(--text-mid); border: 1px solid var(--border); }
.secondary-btn:hover { background: #243044; color: var(--text); }

/* ── Log ── */
.log-section { border-top: 1px solid var(--border); padding: 1.25rem 1.5rem; }

h2 {
    font-size: 0.65rem; font-weight: 800;
    text-transform: uppercase; letter-spacing: 0.12em;
    color: var(--text-dim); margin-bottom: 0.75rem;
}

.log-container {
    height: 120px; overflow-y: auto;
    background: var(--screen-bg);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 0.6rem 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    display: flex; flex-direction: column-reverse; gap: 0.35rem;
}
.log-container::-webkit-scrollbar { width: 4px; }
.log-container::-webkit-scrollbar-track { background: transparent; }
.log-container::-webkit-scrollbar-thumb { background: var(--border); border-radius: 999px; }

.log-entry { color: var(--text-dim); }
.log-entry.info { color: var(--primary); }
.log-entry.success { color: var(--success); }
.log-entry.error { color: var(--error); }
.log-entry.warn { color: var(--warning); }