/* Mobile-first CSS for Propina Calculator */

/* CSS Variables */
:root {
    --color-primary: #10B981;
    --color-primary-dark: #059669;
    --color-primary-light: #D1FAE5;
    --color-bg: #F3F4F6;
    --color-card: #FFFFFF;
    --color-text: #1F2937;
    --color-text-light: #6B7280;
    --color-border: #E5E7EB;
    --color-accent: #F59E0B;
    --color-error: #EF4444;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition-speed: 0.2s;
}

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

/* Base */
html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
    min-height: 100dvh;
}

/* Container */
.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 16px;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    text-align: center;
    padding: 24px 0 16px;
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 4px;
}

.subtitle {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* Calculator Main */
.calculator {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Form Groups */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text);
}

/* Select Input */
.select-input {
    width: 100%;
    height: 52px;
    padding: 0 16px;
    font-size: 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-card);
    color: var(--color-text);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
    transition: border-color var(--transition-speed);
}

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

/* Service Buttons */
.service-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.service-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 12px 8px;
    min-height: 72px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-card);
    cursor: pointer;
    transition: all var(--transition-speed);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.service-btn:active {
    transform: scale(0.98);
}

.service-btn.active {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.service-icon {
    font-size: 1.5rem;
}

.service-name {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text);
}

/* Amount Input */
.amount-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol {
    position: absolute;
    left: 16px;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-light);
    pointer-events: none;
}

.amount-input {
    width: 100%;
    height: 56px;
    padding: 0 16px 0 40px;
    font-size: 1.5rem;
    font-weight: 600;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-card);
    color: var(--color-text);
    transition: border-color var(--transition-speed);
}

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

.amount-input::placeholder {
    color: var(--color-border);
}

/* Remove number input spinners */
.amount-input::-webkit-outer-spin-button,
.amount-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.amount-input[type=number] {
    -moz-appearance: textfield;
}

/* Error Message */
.error-message {
    font-size: 0.85rem;
    color: var(--color-error);
    min-height: 20px;
}

/* Result Card */
.result-card {
    background: var(--color-card);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-md);
    display: none;
    flex-direction: column;
    gap: 16px;
    animation: slideUp 0.3s ease-out;
}

.result-card.visible {
    display: flex;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-label {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.result-country {
    font-size: 0.85rem;
    color: var(--color-primary-dark);
    font-weight: 500;
}

.result-amount {
    text-align: center;
    padding: 12px 0;
}

.tip-range {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
}

.tip-percent {
    display: block;
    font-size: 1rem;
    color: var(--color-text-light);
    margin-top: 4px;
}

.result-note {
    background: var(--color-primary-light);
    border-radius: var(--radius-sm);
    padding: 12px;
    text-align: center;
}

.result-note p {
    font-size: 0.9rem;
    color: var(--color-primary-dark);
    font-style: italic;
}

/* Slider Section */
.slider-section {
    padding-top: 8px;
    border-top: 1px solid var(--color-border);
}

.slider-section label {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 8px;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.slider {
    flex: 1;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--color-border);
    border-radius: 4px;
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-speed);
}

.slider::-webkit-slider-thumb:active {
    transform: scale(1.1);
}

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

.slider-value {
    min-width: 48px;
    text-align: right;
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-text);
}

/* Total Section */
.total-section {
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.total-label {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.total-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
}

.total-final {
    padding-top: 8px;
    border-top: 1px dashed var(--color-border);
}

.total-final .total-label {
    font-weight: 700;
    color: var(--color-text);
}

.total-final .total-value {
    font-size: 1.5rem;
    color: var(--color-primary);
}

/* Copy Button */
.copy-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    height: 48px;
    border: none;
    border-radius: var(--radius-md);
    background: var(--color-primary);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition-speed);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.copy-btn:active {
    background: var(--color-primary-dark);
}

.copy-btn.copied {
    background: var(--color-accent);
}

.copy-icon {
    font-size: 1.1rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 24px 0 16px;
    margin-top: auto;
}

.footer p {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.footer a {
    color: var(--color-primary);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Tablet and Desktop */
@media (min-width: 768px) {
    .container {
        padding: 24px;
    }

    .header {
        padding: 32px 0 24px;
    }

    .header h1 {
        font-size: 2rem;
    }

    .calculator {
        gap: 24px;
    }

    .service-buttons {
        gap: 12px;
    }

    .service-btn {
        min-height: 80px;
        padding: 16px 12px;
    }

    .service-icon {
        font-size: 1.75rem;
    }

    .service-name {
        font-size: 0.9rem;
    }

    .result-card {
        padding: 24px;
    }

    .tip-range {
        font-size: 2.5rem;
    }
}

/* Accessibility - Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .result-card {
        animation: none;
    }

    .slider::-webkit-slider-thumb:active {
        transform: none;
    }

    .service-btn:active {
        transform: none;
    }
}