:root {
    /* Color Palette */
    --primary-color: #2e7d32;
    /* Green 800 */
    --primary-light: #4caf50;
    /* Green 500 */
    --primary-dark: #1b5e20;
    /* Green 900 */
    --accent-color: #ffc107;
    /* Amber 500 */
    --background-color: #e8f5e9;
    /* Green 50 */
    --surface-color: #ffffff;
    --text-primary: #212121;
    --text-secondary: #757575;
    --error-color: #d32f2f;
    --success-color: #388e3c;

    /* Spacing & Radius */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --border-radius-round: 50%;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

body {
    background-color: var(--background-color);
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: var(--text-primary);
    min-height: 100dvh;
    height: 100dvh;
    display: flex;
    justify-content: center;
    align-items: center;
    touch-action: manipulation;
    overflow: hidden;
    /* Prevent body scroll */
    overscroll-behavior: none;
    /* Prevent bounce */
}

/* Ensure wrapper handles scrolling if needed */
.wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    box-sizing: border-box;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.container {
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
}

/* Card Styles */
.ac-unit,
.auth-container {
    background: var(--surface-color);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
}

.auth-container {
    text-align: center;
}

h3 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

/* Controls */
.control {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.control h2 {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Buttons */
button {
    border: none;
    border-radius: var(--border-radius-sm);
    background: var(--primary-color);
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 600;
    font-size: 1rem;
    box-shadow: var(--shadow-sm);
}

button:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

button:active {
    transform: translateY(0);
}

/* Power Button */
#powerBtn {
    width: 100%;
    padding: var(--spacing-md);
    font-size: 1.2rem;
    background: var(--error-color);
    border-radius: var(--border-radius-md);
    margin-top: var(--spacing-sm);
}

#powerBtn.on {
    background: var(--success-color);
}

/* Sliders */
.slider-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 0 var(--spacing-xs);
    background: #f5f5f5;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
}

.slider-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    min-width: 60px;
    text-align: center;
}

input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    height: 40px;
    /* Increased touch target */
    background: transparent;
    margin: 0;
    cursor: pointer;
}

input[type=range]:focus {
    outline: none;
}

/* Slider Track */
input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 8px;
    cursor: pointer;
    background: #e0e0e0;
    border-radius: 4px;
}

/* Slider Thumb */
input[type=range]::-webkit-slider-thumb {
    height: 24px;
    width: 24px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    -webkit-appearance: none;
    background: var(--primary-color);
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -8px;
    /* (8px track - 24px thumb) / 2 */
    /* centers thumb on track */
    box-shadow: var(--shadow-sm);
    transition: transform 0.1s;
}

input[type=range]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Firefox styles */
input[type=range]::-moz-range-track {
    width: 100%;
    height: 8px;
    cursor: pointer;
    background: #e0e0e0;
    border-radius: 4px;
}

input[type=range]::-moz-range-thumb {
    height: 24px;
    width: 24px;
    border: none;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

/* Control Groups (Temp, Fan, Timer) */
.button-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #f5f5f5;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-md);
}

.button-group span {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    min-width: 60px;
    text-align: center;
}

.temp-btn,
.fan-btn,
.timer-btn {
    width: 48px;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    border-radius: var(--border-radius-sm);
    background: white;
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.temp-btn:hover,
.fan-btn:hover,
.timer-btn:hover {
    background: var(--primary-color);
    color: white;
}

/* Unit Selection */
.unit-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.unit-btn {
    padding: var(--spacing-md) var(--spacing-sm);
    background: #f5f5f5;
    color: var(--text-secondary);
    border: 2px solid transparent;
    font-size: 0.9rem;
}

.unit-btn:hover {
    background: #e0e0e0;
    color: var(--text-primary);
}

.unit-btn.active {
    background: #e8f5e9;
    color: var(--primary-dark);
    border-color: var(--primary-color);
    font-weight: 700;
}

/* Pulse Button (Toldo) */
.pulse-btn-round {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(145deg, var(--primary-color), var(--primary-dark));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: var(--spacing-lg) auto;
    box-shadow: 0 10px 25px rgba(46, 125, 50, 0.3);
    border: 4px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.pulse-btn-round i {
    font-size: 3rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.pulse-btn-round:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 35px rgba(46, 125, 50, 0.4);
}

.pulse-btn-round:active {
    transform: scale(0.95);
}

.pulse-btn-round.open {
    background: linear-gradient(145deg, #ffca28, #ff6f00);
    box-shadow: 0 0 0 8px rgba(255, 202, 40, 0.2), 0 10px 25px rgba(255, 111, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.4);
}

.pulse-btn-round.loading {
    opacity: 0.8;
    cursor: wait;
    background: var(--text-secondary);
    border-color: #ccc;
    box-shadow: none;
}

/* Pulse Status Label */
.pulse-status-label {
    margin-top: var(--spacing-md);
    font-weight: 700;
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.pulse-status-label.open {
    color: #ff6f00;
    /* Orange/Amber */
}

.pulse-status-label.closed {
    color: var(--text-secondary);
}

/* Info Box */
.toldo-info {
    background: #fff3e0;
    color: #e65100;
    border: 1px solid #ffe0b2;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    font-size: 0.9rem;
    line-height: 1.5;
    box-shadow: var(--shadow-sm);
}

/* Flags */
.flags {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.flag {
    width: 28px;
    height: auto;
    border-radius: 4px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s;
    opacity: 0.7;
}

.flag:hover {
    transform: scale(1.2);
    opacity: 1;
}

/* Auth Form */
.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.login-form input {
    padding: var(--spacing-md);
    border: 2px solid #e0e0e0;
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.login-form input:focus {
    border-color: var(--primary-color);
    outline: none;
}

.login-form button {
    padding: var(--spacing-md);
    background: var(--primary-dark);
}

/* Error Message */
.error-message {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    width: 90%;
    max-width: 400px;
    background-color: #ffebee;
    color: var(--error-color);
    padding: var(--spacing-md);
    text-align: center;
    border-radius: var(--border-radius-md);
    display: none;
}

@keyframes slideIn {
    from {
        transform: translateY(-10px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Logout Button */
#logoutBtn {
    background: transparent;
    color: var(--text-secondary);
    font-size: 1.2rem;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: none;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    z-index: 20;
}

#logoutBtn:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--error-color);
    transform: scale(1.1);
}

/* Responsive adjustments */
@media (max-width: 480px) {
    body {
        background-color: var(--surface-color);
        align-items: flex-start;
    }

    .wrapper {
        padding: 0;
        height: 100vh;
        align-items: flex-start;
    }

    .container {
        max-width: 100%;
        height: 100%;
    }

    .ac-unit,
    .auth-container {
        border-radius: 0;
        box-shadow: none;
        min-height: 100dvh;
        display: flex;
        flex-direction: column;
        justify-content: center;
        padding: var(--spacing-md);
        padding-top: env(safe-area-inset-top);
        /* Add extra spacing at the bottom to avoid iPhone home indicator interference */
        padding-bottom: calc(env(safe-area-inset-bottom) + 40px);
    }

    .unit-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Adjust pulse button for smaller screens */
    .pulse-btn-round {
        width: 100px;
        height: 100px;
    }

    .pulse-btn-round i {
        font-size: 2.5rem;
    }
}