@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');


:root {
    --bg-main: #f5f7fa;
    --text-main: #1a1a1a;

    --card-bg: #ffffff;
    --card-border: #e2e8f0;

    --input-bg: #f9fafb;
    --input-border: #d0d7e2;

    --primary: #1769ff;
    --primary-hover: #0f52cc;

    --soft-bg: #f0f6ff;
    --soft-border: #1769ff;

    --danger: #e11d48;
    --danger-soft: #fee2e2;

    --list-bg: #f9fafb;
    --list-border: #e1e8f0;
}

/* DARK MODE */
body.dark {
    --bg-main: #121212;
    --text-main: #eaeaea;

    --card-bg: #1e1e1e;
    --card-border: #2a2a2a;

    --input-bg: #1a1a1a;
    --input-border: #333;

    --primary: #4f8cff;
    --primary-hover: #3b6fdc;

    --soft-bg: #1c2a3a;
    --soft-border: #4f8cff;

    --danger: #f87171;
    --danger-soft: #3a1a1a;

    --list-bg: #1a1a1a;
    --list-border: #2f2f2f;
}


* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Inter", sans-serif;
}

/* BODY */
body {
    background: var(--bg-main);
    color: var(--text-main);
    padding: 40px 20px;
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

/* APP CONTAINER */
.app-container {
    width: 100%;
    max-width: 850px;
}

/* HEADER */
.header {
    text-align: center;
    margin-bottom: 32px;
}

.header h1 {
    font-size: 2.4rem;
    font-weight: 600;
    color: var(--primary);
}

.header p {
    color: #777;
    margin-top: 6px;
}

/* THEME BUTTON */
.theme-btn {
    background: #ffffff;
    color: #1a1a1a;
    border: 1px solid #e2e8f0;
    padding: 10px 16px;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* HOVER */
.theme-btn:hover {
    background: #f1f5f9;
}

/* DARK MODE ACTIVE STATE */
body.dark .theme-btn {
    background: #1f2933;
    color: #f9fafb;
    border-color: #334155;
}


/* RESET BUTTON */
.reset-container {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 20px;
}

.reset-btn {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
    padding: 10px 16px;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
}

.reset-btn:hover {
    background: var(--danger-soft);
}

/* CARD */
.card {
    background: var(--card-bg);
    padding: 26px;
    border-radius: 14px;
    margin-bottom: 28px;
    border: 1px solid var(--card-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.card-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 18px;
}

/* FORM */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group.full {
    grid-column: span 2;
}

label {
    font-size: 0.9rem;
    font-weight: 500;
}

input {
    padding: 12px;
    border-radius: 10px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    font-size: 1rem;
    outline: none;
    color: var(--text-main);
}

input:focus {
    border-color: var(--primary);
}

/* BUTTONS */
.primary-btn {
    background: var(--primary);
    color: white;
    padding: 14px 16px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: 0.25s ease;
}

.primary-btn:hover {
    background: var(--primary-hover);
}

.primary-btn.full {
    grid-column: span 2;
}

/* EXPENSES */
.expense-list {
    list-style: none;
}

.expense-list li {
    background: var(--list-bg);
    border: 1px solid var(--list-border);
    padding: 12px 16px;
    border-radius: 10px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
}

.expense-text {
    font-size: 0.95rem;
}

/* BALANCES */
.balance-grid {
    display: grid;
    gap: 12px;
}

.balance-grid div {
    background: var(--soft-bg);
    border-left: 4px solid var(--soft-border);
    padding: 12px 16px;
    border-radius: 10px;
    font-weight: 500;
}

/* CHART */
.chart-wrapper {
    width: 100%;
    max-width: 500px;
    height: 320px;
    margin: 0 auto;
}

.chart-wrapper canvas {
    width: 100% !important;
    height: auto !important;
}


/* SETTLEMENTS */
.settlement-list li {
    padding: 10px;
    margin-bottom: 8px;
    background: var(--list-bg);
    border-radius: 8px;
    font-weight: 500;
}

/* DELETE BUTTON */
.delete-btn {
    background: transparent;
    border: none;
    color: #e63946;
    font-size: 16px;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 6px;
    transition: background 0.2s ease;
}

.delete-btn:hover {
    background: var(--danger-soft);
}

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

/*
   RESPONSIVE DESIGN
/* Tablets (<= 768px) */
@media (max-width: 768px) {
    body {
        padding: 20px 12px;
    }

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

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

    .form-grid {
        grid-template-columns: 1fr;
    }

    .form-group.full,
    .primary-btn.full {
        grid-column: span 1;
    }

    .chart-wrapper {
        width: 100%;
    }

    .chart-wrapper canvas {
        width: 100% !important;
        height: auto !important;
    }
}

/* Mobile (<= 480px) */
@media (max-width: 600px) {

    .header h1 {
        font-size: 1.7rem;
    }

    .header p {
        font-size: 0.9rem;
    }

    .card {
        padding: 18px;
    }

    .card-title {
        font-size: 1.1rem;
    }

    input {
        font-size: 0.95rem;
        padding: 10px;
    }

    .primary-btn,
    .reset-btn,
    .theme-btn {
        width: 100%;
        justify-content: center;
    }

    .reset-container {
        justify-content: center;
    }

    .expense-list li {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .delete-btn {
        align-self: flex-end;
    }
}