:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --input-bg: #2d2d2d;
    --text-main: #e0e0e0;
    --text-muted: #a0a0a0;
    --accent: #bb86fc;
    --success: #03dac6;
    --warning: #ffb74d;
    --danger: #cf6679;
    --border: #333;
    --font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-family);
    padding: 10px;
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 100%;
    width: 100%;
    margin: 0 auto;
}

.page-title {
    text-align: center;
    color: var(--accent);
    margin-bottom: 25px;
    font-size: 2rem;
    font-weight: 700;
    margin-top: 10px;
}

/* --- Settings --- */
.settings-panel {
    background-color: var(--card-bg);
    padding: 35px 20px 20px 20px;
    /* More top padding for button */
    border-radius: 12px;
    margin-top: 25px;
    /* Changed from margin-bottom to margin-top */
    margin-bottom: 0;
    border: 1px solid var(--border);
    position: relative;
    transition: all 0.3s ease;
}

.settings-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    transition: opacity 0.3s ease, margin 0.3s ease;
}

.settings-panel.collapsed .settings-content {
    display: none;
    opacity: 0;
}

.settings-panel.collapsed {
    padding-bottom: 10px;
    /* Smaller padding when collapsed */
}



.btn-toggle {
    position: absolute;
    top: 5px;
    left: 50%;
    transform: translateX(-50%);
    background: #333;
    color: #ccc;
    font-size: 0.8rem;
    padding: 4px 12px;
    border-radius: 12px;
    border: 1px solid #444;
    cursor: pointer;
    z-index: 10;
}

.btn-toggle:hover {
    background: #444;
    color: white;
}

.save-indicator {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 0.75rem;
    color: var(--success);
    opacity: 0;
    transition: opacity 0.5s;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 600;
}

.input-group input {
    background-color: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 12px;
    border-radius: 8px;
    font-size: 1rem;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent);
}

/* --- Table --- */
.table-container {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    overflow-x: auto;
    border: 1px solid var(--border);
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 900px;
}

th {
    text-align: left;
    padding: 15px;
    color: var(--accent);
    border-bottom: 2px solid var(--border);
}

td {
    padding: 10px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

td input {
    width: 100%;
    background-color: var(--input-bg);
    border: 1px solid transparent;
    color: white;
    padding: 10px;
    border-radius: 6px;
}

td input:focus {
    border-color: var(--accent);
    outline: none;
}

/* --- Results --- */
.result-cell {
    font-size: 0.9rem;
    line-height: 1.5;
}

.status-pass {
    color: var(--success);
    font-weight: bold;
}

.status-cond {
    color: var(--warning);
    font-weight: bold;
}

.status-fail {
    color: var(--danger);
    font-weight: bold;
}

.target-container {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px dashed var(--border);
}

.target-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
}

.target-item {
    background-color: #252525;
    padding: 4px;
    border-radius: 4px;
    text-align: center;
    font-size: 0.8rem;
    border: 1px solid #333;
}

.t-lbl {
    color: var(--accent);
    font-weight: 700;
    margin-right: 3px;
}

/* --- Buttons --- */
.btn {
    cursor: pointer;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    transition: opacity 0.2s;
}

.btn:hover {
    opacity: 0.8;
}

.btn-add {
    background-color: var(--accent);
    color: #000;
    margin-top: 15px;
}

.btn-remove {
    background-color: var(--danger);
    color: white;
    padding: 8px 12px;
    font-size: 0.8rem;
}

.btn-clear {
    background-color: #444;
    color: #ccc;
    margin-left: 10px;
}

.btn-import {
    background-color: var(--success);
    color: #000;
    margin-left: 10px;
}

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-overlay.active {
    display: flex;
}

/* Added .active class support for JS toggle */
.modal {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    border: 1px solid var(--border);
}

.modal h2 {
    margin-bottom: 15px;
    color: var(--accent);
}

.modal textarea {
    width: 100%;
    height: 200px;
    background: var(--input-bg);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 10px;
    border-radius: 8px;
    resize: vertical;
    margin-bottom: 15px;
}

.modal-info {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 15px;
}

/* --- Summary --- */
.summary-panel {
    margin-top: 25px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

@media screen and (max-width: 480px) {
    .summary-panel {
        grid-template-columns: 1fr;
        /* Stack vertically on very small screens */
    }
}

.summary-card {
    background: linear-gradient(145deg, var(--card-bg), #252530);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border);
    text-align: center;
}

.summary-card h3 {
    font-size: 1rem;
    margin-bottom: 5px;
}

.summary-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--accent);
}

/* --- Mobile Responsive --- */
@media screen and (max-width: 768px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 0 10px;
    }

    /* Transform Table to Card Grid */
    thead {
        display: none;
    }

    /* Reset Table min-width to prevent overflow */
    table {
        min-width: 0;
        width: 100%;
        display: block;
    }

    tbody,
    tr {
        display: grid;
        width: 100%;
    }

    tbody {
        gap: 15px;
    }

    tr {
        grid-template-columns: 1fr 1fr;
        /* 2 Column Grid */
        gap: 8px;
        background-color: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: 12px;
        padding: 12px;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    }

    td {
        display: block;
        padding: 0;
        border: none;
        text-align: left;
    }

    /* 1. Ders Adı - Full Width */
    td:nth-of-type(1) {
        grid-column: span 2;
    }

    /* 2. Kredi & 6. Sil Button - Bottom Row shared? or separate? */
    /* Layout: 
       Row 1: Name (Span 2)
       Row 2: Vize | Final
       Row 3: Kredi | Sil
       Row 4: Result (Span 2)
    */

    /* Vize (3) & Final (4) - Natural Flow (1 col each) */

    /* Result (5) - Full Width */
    td:nth-of-type(5) {
        grid-column: span 2;
        margin-top: 5px;
        padding-top: 5px;
        border-top: 1px dashed #333;
    }

    /* Kredi (2) & Sil (6) */
    /* We want Kredi and Sil on the same row, probably after Vize/Final? 
       Order in HTML: Name(1), Credit(2), Vize(3), Final(4), Result(5), Delete(6).
       Grid Auto Flow is Row.
       1 (Span 2) -> Row 1
       2 (1 col) -> Row 2 Left
       3 (1 col) -> Row 2 Right
       4 (1 col) -> Row 3 Left
       5 (Span 2) -> Row 4
       6 (1 col) ... Wait, HTML order matters.
       
       We need to force positions if we want specific layout.
       Let's try:
       Name (1) -> Order 1 (Span 2)
       Vize (3) -> Order 2
       Final (4) -> Order 3
       Kredi (2) -> Order 4
       Delete (6) -> Order 5
       Result (5) -> Order 6 (Span 2)
    */

    /* Kredi (2) & Sil (6) */
    td:nth-of-type(1) {
        order: 1;
        grid-column: span 2;
    }

    td:nth-of-type(3) {
        order: 2;
    }

    /* Vize */
    td:nth-of-type(4) {
        order: 3;
    }

    /* Final */
    td:nth-of-type(2) {
        order: 4;
    }

    /* Kredi */
    td:nth-of-type(6) {
        order: 5;
    }

    /* Sil */
    td:nth-of-type(5) {
        order: 6;
        grid-column: span 2;
        background: rgba(0, 0, 0, 0.2);
        padding: 8px;
        border-radius: 6px;
    }

    /* Restore Labels (Data-Label) and Stack Them */
    td::before {
        display: block;
        content: attr(data-label);
        font-size: 0.85rem;
        color: var(--text-muted);
        margin-bottom: 4px;
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.5px;
    }

    /* Ensure content stacks vertically */
    td {
        display: flex;
        flex-direction: column;
        justify-content: flex-end;
    }

    /* Input styling adjustment for mobile */
    td input {
        width: 100%;
        text-align: center;
        background: var(--input-bg);
        border: 1px solid var(--border);
        padding: 12px;
        /* larger touch target */
        font-size: 1.2rem;
        /* larger text */
    }

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

    /* Result cell specific */
    td.result-cell {
        text-align: center;
        width: 100%;
    }

    /* Buttons */
    .btn {
        width: 100%;
        padding: 10px;
        margin: 0;
        height: 100%;
        /* Fill cell */
        display: flex;
        font-size: 1.1rem;
        align-items: center;
        justify-content: center;
    }

    .btn-remove {
        background-color: var(--danger);
    }

    /* Target Grid Mobile Override: Vertical List */
    .target-grid {
        grid-template-columns: 1fr;
    }
}

/* --- Collapsible Targets --- */
details.target-details {
    margin-top: 10px;
    padding-top: 5px;
    border-top: 1px dashed var(--border);
}

details.target-details summary {
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 8px;
    outline: none;
    list-style: none;
    /* Hide default triangle in some browsers if desired, but default is fine usually */
}

details.target-details summary:hover {
    color: var(--accent);
}

/* Optional: rotate summary marker? */
details.target-details[open] summary {
    margin-bottom: 10px;
}

/* --- GitHub Support Link --- */
.github-support {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    color: var(--text-muted);
    transition: color 0.3s ease, transform 0.3s ease;
    background-color: var(--card-bg);
    border-radius: 50%;
    padding: 10px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
}

.github-support:hover {
    color: var(--accent);
    transform: scale(1.1);
    border-color: var(--accent);
    box-shadow: 0 4px 15px rgba(187, 134, 252, 0.3);
}

/* --- Sidebar & Layout --- */
.main-wrapper {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.sidebar {
    width: 250px;
    flex-shrink: 0;
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 15px;
    border: 1px solid var(--border);
    position: sticky;
    top: 20px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}

.content {
    flex-grow: 1;
    min-width: 0;
    /* Prevent flex overflow */
}

.sidebar-header {
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 15px;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 8px;
}

.sidebar-item {
    display: block;
    width: 100%;
    text-align: left;
    background: transparent;
    color: var(--text-muted);
    padding: 10px 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 5px;
    transition: all 0.2s;
    font-size: 0.9rem;
}

.sidebar-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.sidebar-item.active {
    background-color: var(--accent);
    color: #000;
    font-weight: 600;
}

.btn-add-term {
    width: 100%;
    margin-top: 10px;
    background-color: #333;
    color: #ccc;
    border: 1px dashed #555;
    padding: 8px;
}

.btn-add-term:hover {
    background-color: #444;
    border-color: var(--accent);
    color: white;
}

/* Mobile Sidebar */
@media screen and (max-width: 768px) {
    .main-wrapper {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        position: static;
        max-height: none;
        display: flex;
        overflow-x: auto;
        padding: 10px;
        align-items: center;
        gap: 10px;
    }

    .sidebar-header {
        display: none;
        /* Hide header on mobile to save space */
    }

    .sidebar-item {
        width: auto;
        white-space: nowrap;
        margin: 0;
        flex-shrink: 0;
        padding: 10px 15px;
        background: rgba(255, 255, 255, 0.1);
        border-radius: 20px;
        border: 1px solid var(--border);
    }

    .sidebar-item.active {
        background: var(--accent);
        color: #000;
        border-color: var(--accent);
    }

    .btn-add-term {
        width: auto;
        margin: 0;
        white-space: nowrap;
    }
}