:root {
    --bg-color: #121212;
    --card-bg: rgba(255, 255, 255, 0.05);
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-color: #bb86fc;
    --accent-gradient: linear-gradient(135deg, #bb86fc, #3700b3);
    --input-bg: rgba(255, 255, 255, 0.1);
    --font-family: 'Outfit', sans-serif;
    --card-border: 1px solid rgba(255, 255, 255, 0.1);
    --card-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    /* Align to top for mobile scrolling */
    padding: 20px;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 480px;
    margin-top: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-weight: 600;
    font-size: 2rem;
    background: var(--accent-gradient);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

.input-group {
    margin-bottom: 30px;
}

label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol {
    position: absolute;
    left: 20px;
    font-size: 1.5rem;
    color: var(--text-secondary);
    pointer-events: none;
}

input[type="number"] {
    width: 100%;
    background: var(--input-bg);
    border: 2px solid transparent;
    border-radius: 16px;
    padding: 20px 20px 20px 45px;
    font-size: 2rem;
    color: var(--text-primary);
    font-family: var(--font-family);
    outline: none;
    transition: all 0.3s ease;
    appearance: textfield;
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"]:focus {
    border-color: var(--accent-color);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 20px rgba(187, 134, 252, 0.2);
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.tip-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: var(--card-border);
    border-radius: 20px;
    padding: 20px;
    box-shadow: var(--card-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.tip-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.2);
}

.tip-card.highlight {
    background: rgba(187, 134, 252, 0.1);
    border-color: rgba(187, 134, 252, 0.3);
}

.tip-header {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 5px;
}

.tip-amount,
.total-amount {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

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

.value {
    font-size: 1.1rem;
    font-weight: 400;
}

.total-amount .value {
    font-weight: 600;
    font-size: 1.2rem;
}

@media (max-width: 380px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
}

/* Custom Panel Styles */
.custom-panel {
    margin-top: 30px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 25px;
}

.custom-panel h2 {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-weight: 400;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.custom-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 15px;
}

.input-group-small label {
    font-size: 0.75rem;
    margin-bottom: 8px;
}

.input-wrapper-small {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper-small input {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 12px 12px;
    font-size: 1.1rem;
    color: var(--text-primary);
    outline: none;
    transition: all 0.3s ease;
    text-align: center;
}

.input-wrapper-small input:focus {
    border-color: var(--accent-color);
    background: rgba(255, 255, 255, 0.1);
}

.prefix,
.suffix {
    position: absolute;
    color: var(--text-secondary);
    font-size: 0.9rem;
    pointer-events: none;
}

.prefix {
    left: 10px;
}

.suffix {
    right: 10px;
}

/* Adjust padding for prefix/suffix */
#customPercent {
    padding-right: 25px;
}

#customTip,
#customTotal {
    padding-left: 20px;
}

@media (max-width: 400px) {
    .custom-inputs {
        grid-template-columns: 1fr;
    }
}