/* Base Styles & Variables */
:root {
    /* Colors extracted from LP Water Services Logo */
    --primary-blue: #1c2b70;    /* The dark navy blue */
    --secondary-blue: #0099ff;  /* The bright cyan/light blue wave */
    --accent-blue: #00bfff;     /* The lighter cyan wave */
    
    /* UI Colors */
    --bg-color: #f4f7fa;        /* Soft gray-blue background */
    --surface-color: #ffffff;   /* White card background */
    --text-main: #333333;
    --text-muted: #666666;
    --border-color: #e2e8f0;
    --success-color: #10b981;   /* Green for saved states */
    --error-color: #ef4444;     /* Red for errors */
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Header */
.top-nav {
    background-color: var(--surface-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo-container {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.logo-container h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    letter-spacing: -0.5px;
}

.logo-container span {
    color: var(--secondary-blue);
    font-weight: 600;
}

/* Main App Container */
.app-container {
    max-width: 600px; /* Keep it narrow, focusing on mobile */
    margin: 0 auto;
    padding: 1.5rem 1rem;
}

/* Tabs */
.tab-navigation {
    display: flex;
    background-color: var(--surface-color);
    border-radius: 12px;
    padding: 0.25rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.75rem 1rem;
    border: none;
    background: transparent;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-btn svg {
    width: 20px;
    height: 20px;
}

.tab-btn.active {
    background-color: var(--primary-blue);
    color: white;
    box-shadow: 0 2px 4px rgba(28, 43, 112, 0.2);
}

/* Forms */
.form-section {
    background-color: var(--surface-color);
    padding: 1.5rem;
    border-radius: 16px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
    animation: fadeIn 0.3s ease-out;
}

.form-section h2 {
    font-size: 1.25rem;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

input[type="text"],
input[type="number"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: #f8fafc;
    transition: all 0.2s;
    appearance: none; /* Removes native styling on mobile */
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--secondary-blue);
    background-color: var(--surface-color);
    box-shadow: 0 0 0 3px rgba(0, 153, 255, 0.1);
}

/* Custom Checkbox */
.custom-checkbox {
    display: flex;
    align-items: center;
    position: relative;
    padding-left: 35px;
    cursor: pointer;
    font-size: 1rem;
    user-select: none;
}

.custom-checkbox input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 24px;
    width: 24px;
    background-color: #eee;
    border-radius: 6px;
    transition: 0.2s;
}

.custom-checkbox:hover input ~ .checkmark {
    background-color: #ccc;
}

.custom-checkbox input:checked ~ .checkmark {
    background-color: var(--secondary-blue);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.custom-checkbox input:checked ~ .checkmark:after {
    display: block;
}

.custom-checkbox .checkmark:after {
    left: 9px;
    top: 5px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Submit Buttons */
.submit-btn {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--secondary-blue), var(--accent-blue));
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.2s;
    box-shadow: 0 4px 6px rgba(0, 153, 255, 0.2);
    margin-top: 1rem;
}

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

.expense-btn {
    background: linear-gradient(135deg, var(--primary-blue), #2a3a8a);
    box-shadow: 0 4px 6px rgba(28, 43, 112, 0.2);
}

/* Recent Entries Preview Zone */
.recent-entries-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: var(--surface-color);
    border-radius: 16px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.entries-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.entry-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-radius: 10px;
    border-left: 4px solid var(--border-color);
    background-color: #f8fafc;
    animation: fadeIn 0.3s ease-out;
}

.entry-card.sale {
    border-left-color: var(--success-color);
}

.entry-card.expense {
    border-left-color: var(--error-color);
}

.entry-details p {
    margin-bottom: 0.25rem;
}

.entry-title {
    font-weight: 700;
    color: var(--text-main);
}

.entry-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.entry-amount {
    font-weight: 700;
    font-size: 1.1rem;
}

.sale .entry-amount {
    color: var(--success-color);
}

.expense .entry-amount {
    color: var(--error-color);
}

.empty-state-text {
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    font-size: 0.9rem;
    padding: 2rem 0;
}

.delete-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    margin-left: 0.5rem;
}

.delete-btn:hover {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
}

.entry-right {
    display: flex;
    align-items: center;
}

/* Notifications */
.notification {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--success-color);
    color: white;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 600;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 1000;
}

.notification.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}