/* =============================================================
   DS Audio File Manager — Unified Design System
   Matches frankfarukceviz.uk (D-Summary)
   ============================================================= */

:root {
    --bg-color: #fcfcfc;
    --text-primary: #111111;
    --text-secondary: #555555;
    --text-tertiary: #888888;
    --accent-color: #000000;
    --border-color: #e2e2e2;
    --font-family: 'Inter', sans-serif;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 32px;
    --spacing-xl: 64px;

    --nav-height: 80px;
    --max-w: 1200px;
    --ease: 0.2s ease;
    
    /* App Specific */
    --card-bg: #ffffff;
    --input-bg: #ffffff;
    --output-bg: #f9f9f9;
}

/* ----- Reset & Base ----- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ----- Layout ----- */
.page-container {
    max-width: var(--max-w);
    margin: var(--nav-height) auto 0;
    padding: 40px 24px;
}

.app-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.app-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
    text-transform: uppercase;
}

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

@media (max-width: 992px) {
    .grid { grid-template-columns: 1fr; }
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 24px;
    display: flex;
    flex-direction: column;
}

.card__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.card__title {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 700;
    color: var(--text-tertiary);
}

/* ----- Editor/Inputs ----- */
.editor-box {
    width: 100%;
    height: 300px;
    border: 1px solid var(--border-color);
    padding: 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    overflow: auto;
    background: var(--input-bg);
    outline: none;
    resize: none;
}

.editor-box.output {
    background: var(--output-bg);
}

/* ----- Buttons ----- */
.button {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 12px 24px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all var(--ease);
    display: flex;
    align-items: center;
    gap: 8px;
}

.button:hover:not(:disabled) {
    border-color: var(--text-primary);
    background: #f5f5f5;
}

.button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.button.primary {
    background: var(--text-primary);
    color: #fff;
}

.button.small {
    padding: 6px 12px;
    font-size: 0.65rem;
}

/* ----- Folder Builder ----- */
.builder-area {
    margin-top: 24px;
}

.builder-controls {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
}

.arrow-btn {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-weight: 700;
}

.arrow-btn:hover { background: #f5f5f5; }

.structure-panel {
    border: 1px solid var(--border-color);
    background: #f9f9f9;
    padding: 16px;
    min-height: 200px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
}

.tree-node {
    cursor: pointer;
    padding: 2px 8px;
    margin: 2px 0;
}

.tree-node:hover { background: #f0f0f0; }
.tree-node.selected { background: #111; color: #fff; }

.action-row {
    display: flex;
    gap: 8px;
    margin-top: 16px;
    flex-wrap: wrap;
}

/* ----- Upload Area ----- */
.upload-zone {
    border: 2px dashed var(--border-color);
    padding: 32px;
    text-align: center;
    margin-bottom: 16px;
    cursor: pointer;
    transition: var(--ease);
}

.upload-zone:hover {
    border-color: var(--text-primary);
}

.upload-zone i {
    font-size: 24px;
    margin-bottom: 8px;
    display: block;
}

/* ----- Navbar & Footer ----- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
}

.navbar__logo-img { height: 36px; filter: invert(1); }
.navbar__menu { display: flex; list-style: none; gap: 32px; }
.navbar__link {
    color: var(--text-secondary); text-decoration: none;
    font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em;
}
.navbar__link.active { color: var(--text-primary); }

.navbar__hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}
.navbar__hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transform-origin: center;
    transition: transform 0.3s ease, opacity 0.3s ease, width 0.3s ease;
}
.navbar__hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar__hamburger.is-open span:nth-child(2) { opacity: 0; width: 0; }
.navbar__hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
    .navbar { padding: 0 20px; }
    .navbar__hamburger { display: flex; }
    .navbar__menu {
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: var(--bg-color);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease, padding 0.25s ease;
        padding: 0;
        border-bottom: 1px solid var(--border-color);
        z-index: 99;
    }
    .navbar__menu.is-open {
        max-height: 300px;
        padding: 8px 0 16px;
    }
    .navbar__link {
        display: block;
        padding: 14px 28px;
        text-align: center;
    }
}

.footer { padding: 80px 40px; border-top: 1px solid var(--border-color); background: #fff; margin-top: 64px; }
.footer__inner { max-width: var(--max-w); margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 64px; }
.footer__brand h2 { font-size: 1.5rem; margin-bottom: 16px; }
.footer__newsletter h3 { font-size: 0.8rem; text-transform: uppercase; margin-bottom: 16px; }
.footer__form { display: flex; gap: 0; border: 1px solid var(--border-color); overflow: hidden; }
.footer__form input { flex: 1; border: none; padding: 12px; outline: none; }
.footer__form button { background: var(--text-primary); color: #fff; border: none; padding: 0 24px; cursor: pointer; }

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: #fff;
    padding: 32px;
    width: 400px;
    border: 1px solid var(--border-color);
}

.modal-title {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.modal-input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 16px;
    outline: none;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* Notify */
.notification {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 12px 24px;
    background: #111;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    z-index: 3000;
    transform: translateY(100px);
    transition: transform 0.3s cubic-bezier(0.19, 1, 0.22, 1);
}

.notification.show { transform: translateY(0); }

.hidden { display: none !important; }
.visually-hidden { position: absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); border:0; }