:root {
    --bg-main: #0a0e17;
    --bg-card: rgba(17, 24, 39, 0.75);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(255, 255, 255, 0.15);
    --primary-orange: #f97316;
    --primary-orange-glow: rgba(249, 115, 22, 0.3);
    --whatsapp-green: #25d366;
    --whatsapp-green-glow: rgba(37, 211, 102, 0.3);
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(circle at 10% 10%, rgba(249, 115, 22, 0.07) 0%, transparent 40%),
        radial-gradient(circle at 90% 90%, rgba(37, 211, 102, 0.07) 0%, transparent 40%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 50;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.brand-badge {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, #f97316, #ea580c);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    box-shadow: 0 4px 14px var(--primary-orange-glow);
}

.brand-info h1 {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.brand-info h1 span {
    color: var(--primary-orange);
}

.brand-info p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.header-status {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.4rem 0.9rem;
    border-radius: 9999px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
    font-weight: 500;
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--warning);
    box-shadow: 0 0 8px var(--warning);
    animation: pulse 2s infinite;
}

.status-indicator.ready {
    background: var(--whatsapp-green);
    box-shadow: 0 0 10px var(--whatsapp-green);
}

.status-indicator.error {
    background: var(--danger);
    box-shadow: 0 0 10px var(--danger);
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.9); }
}

/* Layout */
main {
    flex: 1;
    max-width: 1240px;
    margin: 0 auto;
    width: 100%;
    padding: 1.75rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Tab Navigation */
.nav-tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.6rem 1.25rem;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
    color: #fff;
    background: rgba(249, 115, 22, 0.15);
    border: 1px solid rgba(249, 115, 22, 0.3);
    font-weight: 600;
}

/* Tab Content Areas */
.tab-pane {
    display: none;
}

.tab-pane.active {
    display: grid;
    gap: 1.5rem;
}

/* Grid Layouts */
.grid-two-col {
    grid-template-columns: 1fr 1fr;
}

@media (max-width: 850px) {
    .grid-two-col {
        grid-template-columns: 1fr;
    }
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    backdrop-filter: blur(16px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.card-title {
    font-size: 1.05rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

.card-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-top: -0.5rem;
}

/* Forms & Inputs */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

label {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
}

input, select, textarea {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: all 0.2s ease;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary-orange);
    background: rgba(255, 255, 255, 0.07);
    box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.15);
}

select {
    cursor: pointer;
}

select option {
    background: #111827;
    color: #f9fafb;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.25rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #f97316, #ea580c);
    color: #fff;
    box-shadow: 0 4px 14px var(--primary-orange-glow);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #fb923c, #f97316);
    transform: translateY(-1px);
}

.btn-whatsapp {
    background: linear-gradient(135deg, #25d366, #128c7e);
    color: #fff;
    box-shadow: 0 4px 14px var(--whatsapp-green-glow);
}

.btn-whatsapp:hover {
    background: linear-gradient(135deg, #34d399, #10b981);
    transform: translateY(-1px);
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Feedback & Alerts */
.feedback-box {
    padding: 0.85rem 1rem;
    border-radius: 10px;
    font-size: 0.85rem;
    line-height: 1.4;
    display: none;
}

.feedback-box.success {
    display: block;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #a7f3d0;
}

.feedback-box.error {
    display: block;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fecaca;
}

/* QR Code Section */
.qr-container {
    background: #ffffff;
    border-radius: 12px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 280px;
    text-align: center;
}

.qr-container img {
    max-width: 240px;
    width: 100%;
}

/* Logs console */
.console-box {
    background: rgba(0, 0, 0, 0.45);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    max-height: 380px;
    overflow-y: auto;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 0.82rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.log-entry {
    display: flex;
    gap: 0.75rem;
}

.log-timestamp {
    color: var(--text-muted);
    white-space: nowrap;
}

.log-info { color: #93c5fd; }
.log-success { color: #86efac; }
.log-error { color: #fca5a5; }
.log-warning { color: #fde047; }