/* Google Fonts: Poppins - Modern ve Okunaklı */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600&display=swap');

:root {
    --bg-color: #000000;           /* Saf Siyah Arka Plan */
    --card-bg: #1c1c1e;            /* Apple Koyu Gri Panel */
    --accent-blue: #0a84ff;        /* Apple Mavisi */
    --accent-green: #30d158;       /* Apple Yeşili (Gelir) */
    --accent-red: #ff453a;         /* Apple Kırmızısı (Gider) */
    --text-main: #ffffff;          /* Ana Beyaz Yazı */
    --text-dim: #8e8e93;           /* İkincil Gri Yazı */
    --glass: rgba(255, 255, 255, 0.05); /* Cam Efekti Çizgisi */
    --border-radius: 22px;         /* İkonik Apple Köşeleri */
}

/* Temel Sıfırlama */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* --- NAVBAR (Cam Efekti) --- */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 6%;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 0.5px solid var(--glass);
}

.logo {
    font-weight: 600;
    font-size: 1.3rem;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 25px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dim);
    font-size: 0.9rem;
    font-weight: 400;
    transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-links a:hover {
    color: var(--text-main);
}

/* --- BENTO GRID LAYOUT --- */
.container {
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 20px;
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr); /* 4 Sütunlu Yapı */
    grid-auto-rows: minmax(160px, auto);
    gap: 20px;
}

/* Kart Genel Yapısı */
.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 24px;
    border: 1px solid var(--glass);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.5);
    border-color: rgba(255, 255, 255, 0.1);
}

/* Kart Boyutlandırma (Bento Mantığı) */
.col-2 { grid-column: span 2; }
.row-2 { grid-row: span 2; }

/* --- FORM ELEMANLARI --- */
.input-group { margin-bottom: 20px; }
.input-group label { display: block; color: var(--text-dim); margin-bottom: 8px; font-size: 0.8rem; }

input, select, textarea {
    width: 100%;
    padding: 14px;
    border-radius: 12px;
    border: 1px solid var(--glass);
    background: rgba(255, 255, 255, 0.03);
    color: white;
    font-size: 0.9rem;
    outline: none;
    transition: 0.3s;
}

input:focus, select:focus {
    border-color: var(--accent-blue);
    background: rgba(255, 255, 255, 0.06);
}

.btn-primary {
    background: var(--accent-blue);
    color: white;
    border: none;
    padding: 14px 20px;
    border-radius: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s ease;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: scale(0.98);
}

/* --- LİSTE VE TABLO ÖĞELERİ --- */
.list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 0;
    border-bottom: 1px solid var(--glass);
}

.income { color: var(--accent-green); font-weight: 500; }
.expense { color: var(--accent-red); font-weight: 500; }

/* --- RESPONSIVE (MOBİL UYUMLULUK) --- */
@media (max-width: 900px) {
    .bento-grid {
        grid-template-columns: repeat(2, 1fr); /* Tablet için 2 sütun */
    }
}

@media (max-width: 600px) {
    .bento-grid {
        grid-template-columns: 1fr; /* Mobil için tek sütun */
    }
    .col-2, .row-2 { grid-column: span 1; grid-row: span 1; }
    .nav-links { display: none; } /* Mobil menü için geliştirilebilir */
    .container { margin: 20px auto; }
}

/* --- FOOTER --- */
footer {
    text-align: center;
    padding: 50px 20px;
    color: var(--text-dim);
    font-size: 0.75rem;
    opacity: 0.6;
}