:root {
    --primary-color: #00ff88;
    --primary-glow: rgba(0, 255, 136, 0.6);
    --secondary-color: #1a1a2e;
    --bg-color: #0f0f1a;
    --text-color: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --warning-color: #ff3366;
    --diesel-color: #ffaa00;
    --gasolina-color: #00eeff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
    user-select: none;
}

body {
    background-color: var(--bg-color);
    background-image: radial-gradient(circle at 50% 0%, #1a2a3a 0%, var(--bg-color) 70%);
    color: var(--text-color);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.app-container {
    width: 100%;
    max-width: 1024px;
    height: 100vh;
    max-height: 768px;
    position: relative;
    display: flex;
    flex-direction: column;
    z-index: 10;
}

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 3rem;
    z-index: 10;
}

/* AI Voice Visualizer */
.ai-voice-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    height: 40px;
    opacity: 0.2;
    transition: opacity 0.5s ease;
}

.ai-voice-indicator.speaking {
    opacity: 1;
}

.ai-voice-indicator .wave {
    width: 6px;
    height: 10px;
    background-color: var(--primary-color);
    border-radius: 4px;
    box-shadow: 0 0 10px var(--primary-glow);
    transition: height 0.2s ease;
}

.ai-voice-indicator.speaking .wave {
    animation: waveAnim 1s ease-in-out infinite;
}

.ai-voice-indicator.speaking .wave:nth-child(1) { animation-delay: 0.0s; }
.ai-voice-indicator.speaking .wave:nth-child(2) { animation-delay: 0.15s; }
.ai-voice-indicator.speaking .wave:nth-child(3) { animation-delay: 0.3s; }
.ai-voice-indicator.speaking .wave:nth-child(4) { animation-delay: 0.45s; }
.ai-voice-indicator.speaking .wave:nth-child(5) { animation-delay: 0.6s; }

@keyframes waveAnim {
    0%, 100% { height: 10px; }
    50% { height: 35px; box-shadow: 0 0 20px var(--primary-glow); }
}

.logo {
    height: 60px;
    filter: drop-shadow(0 0 10px var(--primary-glow));
}

.time-display {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    letter-spacing: 2px;
}

.screen-container {
    flex: 1;
    position: relative;
    padding: 1rem 3rem 3rem;
}

.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 0 3rem;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease, transform 0.4s ease;
    transform: translateY(20px);
}

.screen.active {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 3rem;
    width: 100%;
    max-width: 800px;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    position: relative;
    z-index: 2;
}

.welcome-card {
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid var(--primary-color);
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.8), 0 0 20px var(--primary-glow) inset;
}

.welcome-card h1 {
    font-size: 4.5rem;
    font-weight: 800;
    text-shadow: 0 5px 15px rgba(0,0,0,0.9);
    filter: drop-shadow(0 4px 10px rgba(0,0,0,0.8));
    margin-bottom: 0.5rem;
}

.welcome-card p {
    font-size: 1.8rem;
    color: #f0f0f0;
    text-shadow: 0 3px 6px rgba(0,0,0,0.9);
    margin-bottom: 3rem;
}

/* Animated CSS Background replacing Video */
.css-animated-bg {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(0, 255, 136, 0.15), var(--bg-color) 60%),
                conic-gradient(from 0deg, transparent 0deg, rgba(0, 255, 136, 0.05) 90deg, transparent 180deg);
    z-index: 1;
    animation: rotateBg 20s linear infinite, pulseBg 5s ease-in-out infinite alternate;
    pointer-events: none;
}

@keyframes rotateBg {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes pulseBg {
    0% { opacity: 0.7; transform: scale(1) rotate(0deg); }
    100% { opacity: 1; transform: scale(1.1) rotate(0deg); }
}

.welcome-car-img {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
    opacity: 0.6;
    pointer-events: none;
    mix-blend-mode: screen;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(15, 15, 26, 0.3) 0%, rgba(15, 15, 26, 0.9) 100%);
    z-index: 2;
    pointer-events: none;
}

/* Ocultar el botón de Play nativo de Safari si bloquea el autoplay */
video::-webkit-media-controls,
video::-webkit-media-controls-start-playback-button,
video::-webkit-media-controls-play-button {
    display: none !important;
    -webkit-appearance: none !important;
}

h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(to right, var(--text-color), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    font-weight: 600;
}

h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

p {
    font-size: 1.2rem;
    color: #a0a0b0;
    margin-bottom: 2rem;
}

.highlight-text {
    font-size: 1.8rem;
    color: var(--primary-color);
    font-weight: 600;
    line-height: 1.4;
}

/* Inputs & Displays */
.input-display {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--primary-color);
    box-shadow: 0 0 15px rgba(0, 255, 136, 0.2) inset;
    border-radius: 12px;
    padding: 1.5rem;
    font-size: 2.5rem;
    letter-spacing: 5px;
    margin-bottom: 2rem;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.amount-display {
    font-size: 4rem;
    font-weight: 800;
    color: var(--primary-color);
    text-shadow: 0 0 20px var(--primary-glow);
    margin: 2rem 0;
}

/* Keypad & Grids */
.keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    max-width: 400px;
    margin: 0 auto 2rem;
}

.small-keypad {
    grid-template-columns: repeat(4, 1fr);
    max-width: 500px;
}

.keypad button {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: white;
    font-size: 1.5rem;
    padding: 1rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.keypad button:active {
    background: var(--primary-color);
    color: black;
    transform: scale(0.95);
}

.amount-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.amount-grid button {
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    font-size: 2rem;
    font-weight: 600;
    padding: 1.5rem;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.2s;
}

.amount-grid button:active {
    background: var(--primary-color);
    color: black;
    transform: scale(0.95);
}

/* Pump Grid */
.pump-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 600px;
    margin: 0 auto 3rem;
}

.pump-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: white;
    font-size: 3rem;
    font-weight: 800;
    padding: 2rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
}

.pump-btn:hover {
    background: rgba(0, 255, 136, 0.2);
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.pump-btn:active {
    background: var(--primary-color);
    color: black;
    transform: scale(0.95);
}

/* Cards (Fuel, Payment) */
.fuel-options, .payment-options {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
}

.fuel-card, .payment-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 3rem 2rem;
    width: 300px;
    cursor: pointer;
    transition: all 0.3s;
}

.fuel-card:hover, .payment-card:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.1);
}

.fuel-card.diesel { border-color: rgba(255, 170, 0, 0.5); }
.fuel-card.diesel:hover { box-shadow: 0 0 30px rgba(255, 170, 0, 0.2); }
.fuel-card.gasolina { border-color: rgba(0, 238, 255, 0.5); }
.fuel-card.gasolina:hover { box-shadow: 0 0 30px rgba(0, 238, 255, 0.2); }

.payment-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 30px var(--primary-glow);
}

.fuel-card .price {
    font-size: 1.5rem;
    font-weight: 600;
    color: #a0a0b0;
}

.payment-card .icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 1rem;
}

/* Buttons */
.actions {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 2rem;
}

.invoice-options {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
}

.invoice-options button {
    width: 200px;
    height: 80px;
    font-size: 2rem;
}

button {
    outline: none;
}

.btn-primary, .btn-secondary, .btn-warning {
    padding: 1.2rem 3rem;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary {
    background: var(--primary-color);
    color: #000;
    box-shadow: 0 0 20px var(--primary-glow);
}

.btn-primary:active {
    transform: scale(0.95);
    box-shadow: 0 0 10px var(--primary-glow);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid var(--glass-border);
}

.btn-secondary:active {
    background: rgba(255, 255, 255, 0.2);
}

.btn-warning {
    background: rgba(255, 51, 102, 0.2);
    color: var(--warning-color);
    border: 1px solid var(--warning-color);
}

.btn-warning:active {
    background: var(--warning-color);
    color: white;
}

/* Icons */
.alert-icon {
    font-size: 5rem;
    margin-bottom: 1rem;
}

.success-icon {
    font-size: 6rem;
    margin-bottom: 1rem;
    text-shadow: 0 0 30px var(--primary-glow);
}

.receipt-info {
    margin: 2rem 0;
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    font-size: 1.1rem;
    text-align: left;
    display: inline-block;
    min-width: 300px;
}

.receipt-info div {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    border-bottom: 1px dashed rgba(255,255,255,0.2);
    padding-bottom: 0.5rem;
}

.receipt-info div:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

/* Subtle Welcome UI (Unobtrusive) */
.welcome-top {
    position: absolute;
    top: 15%;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 10;
    width: 90%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    pointer-events: none;
}

.welcome-bottom {
    position: absolute;
    bottom: 22%;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 10;
    width: 90%;
    display: flex;
    justify-content: center;
    pointer-events: none;
}

.welcome-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 0 4px 20px rgba(0,0,0, 0.9);
    letter-spacing: 2px;
    margin: 0;
}

.welcome-subtitle {
    font-size: 1.2rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.85);
    text-shadow: 0 2px 15px rgba(0,0,0, 0.8);
    margin: 0;
}

.welcome-btn {
    margin-top: 15px;
    padding: 12px 35px;
    border-radius: 50px;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    letter-spacing: 2px;
    box-shadow: 0 4px 25px rgba(0,0,0, 0.5);
    animation: pulseGlow 2.5s infinite;
}

@keyframes pulseGlow {
    0% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0.4); }
    70% { box-shadow: 0 0 0 15px rgba(0, 255, 136, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0); }
}

/* 📱 Responsive Design for Mobile Devices */
@media (max-width: 768px) {
    .app-container {
        max-height: none;
        height: 100dvh;
        overflow-y: auto;
    }

    .main-header {
        padding: 1rem;
    }

    .logo {
        height: 40px;
    }

    .time-display {
        font-size: 1.2rem;
    }

    .screen {
        padding: 0 1rem;
        align-items: flex-start;
        overflow-y: auto;
    }

    .screen-container {
        padding: 0 1rem 1rem;
    }

    .glass-card {
        padding: 1.5rem;
        margin-top: 1rem;
        margin-bottom: 2rem;
        width: 100%;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; margin-bottom: 1.5rem; }
    h3 { font-size: 1.2rem; }
    p { font-size: 1rem; margin-bottom: 1.5rem; }
    
    .highlight-text { font-size: 1.3rem; }

    .welcome-title { font-size: 1.8rem; }
    .welcome-subtitle { font-size: 1rem; }
    .welcome-btn { font-size: 1rem; padding: 10px 25px; }

    .fuel-options, .payment-options {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }

    .fuel-card, .payment-card {
        width: 100%;
        max-width: 300px;
        padding: 1.5rem;
    }

    .pump-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .pump-btn {
        font-size: 2rem;
        padding: 1rem;
    }

    .input-display {
        font-size: 1.8rem;
        letter-spacing: 3px;
        min-height: 60px;
        padding: 1rem;
        margin-bottom: 1.5rem;
    }

    .amount-display {
        font-size: 2.5rem;
        margin: 1.5rem 0;
    }

    .amount-grid {
        gap: 1rem;
    }

    .amount-grid button {
        font-size: 1.5rem;
        padding: 1rem;
    }

    .keypad, .small-keypad {
        max-width: 100%;
        gap: 0.5rem;
    }

    #keypad-letters {
        grid-template-columns: repeat(5, 1fr) !important;
    }

    .keypad button {
        font-size: 1.2rem;
        padding: 0.8rem;
    }

    .actions {
        flex-direction: column;
        gap: 1rem;
    }

    .actions button {
        width: 100%;
    }

    .invoice-options {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
        margin-top: 1.5rem;
    }

    .invoice-options button {
        width: 100%;
        max-width: 300px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .alert-icon { font-size: 3rem; }
    .success-icon { font-size: 4rem; }
    
    .receipt-info {
        min-width: 100%;
        font-size: 1rem;
    }
}