:root{
        --ease-in-cubic: cubic-bezier(0.55,0.055,0.675,0.19);
        --gap-sm: clamp(0.5rem, 1.2vw, 1rem);
        --gap-md: clamp(0.75rem, 2vw, 1.5rem);
        --gap-lg: clamp(1rem, 3vw, 2.25rem);
        --radius-sm: 6px;
        --radius-md: 10px;
        --header-h: 64px;
        --content-max: 760px;
        --fg: #111;
        --muted: #6b7280;
        --border: #d1d5db;
        --bg: #ffffff;
        --card-bg: #ffffff;
        --chip-bg: #f9fafb;
        --grid-line: rgba(0,0,0,0.05);
        --header-bg: #000;
        --header-fg: #fff;
    }
    [data-theme="dark"]{
        --fg: #f3f4f6;
        --muted: #9ca3af;
        --border: #374151;
        --bg: #0b0c0f;
        --card-bg: #14161a;
        --chip-bg: #1f2228;
        --grid-line: rgba(255,255,255,0.05);
        --header-bg: #14161a;
        --header-fg: #f3f4f6;
    }
    @font-face {
        font-family: "Space Grotesk";
        font-weight: 400 900;
        font-style: normal;
        src: url("/assets/fonts/Space_Grotesk/SpaceGrotesk-VariableFont_wght.ttf") format("truetype-variations");
    }
    *,*::before,*::after{ box-sizing: border-box; }
    *{
        text-rendering: optimizeLegibility;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        font-family: "Space Grotesk","Inter",system-ui,-apple-system,sans-serif;
        
    }
    html, body{ margin: 0; padding: 0; width: 100%; min-height: 100%; scroll-behavior: smooth; }
    body{
        color: var(--fg);
        background-color: var(--bg);
        background-image:
            linear-gradient(var(--grid-line) 1px, transparent 1px),
            linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
        background-size: 8px 8px;
        align-content:center;
    }
    a{ color: inherit; text-decoration: none; }
    button{ font: inherit; cursor: pointer; }

    header{
        position: fixed; top: 0; left: 0; right: 0; z-index: 100;
        height: var(--header-h);
        background-color: var(--header-bg); color: var(--header-fg);
        display: flex; align-items: center; justify-content: space-between;
        padding: 0 clamp(0.75rem, 3vw, 2rem); gap: var(--gap-sm);
    }
    .header-left{ display: flex; align-items: center; gap: 0.6rem; }
    .header-right{ display: flex; align-items: center; gap: 0.5rem; }
    .brand{ font-weight: 700; color: var(--header-fg); }
    header > nav{ display: flex; gap: 0.5rem; }
    header > nav > a{
        color: rgb(185,185,185);
        padding: 0.4rem 0.7rem; border-radius: var(--radius-sm); font-size: 0.9rem;
        transition: color 0.15s ease, background-color 0.15s ease;
    }
    header > nav > a:hover{ color: white; background: rgba(255,255,255,0.08); }

    /* Day/night toggle (top-left) */
    .theme-toggle{
        display: inline-flex; align-items: center; gap: 0.4rem;
        background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.2);
        color: var(--header-fg); padding: 0.25rem 0.4rem 0.25rem 0.3rem;
        border-radius: 999px; cursor: pointer; font-size: 0.8rem;
        transition: background 0.15s ease;
    }
    .theme-toggle:hover{ background: rgba(255,255,255,0.16); }
    .theme-toggle .knob{
        width: 22px; height: 22px; border-radius: 999px;
        background: #fff; color: #111;
        display: inline-flex; align-items: center; justify-content: center;
        font-size: 0.85rem;
    }
    [data-theme="dark"] .theme-toggle .knob{ background: #111; color: #fff; }

    .logout-btn{
        background: white; color: black; border: 2px solid black;
        border-radius: var(--radius-sm); padding: 0.4rem 0.8rem;
        font-size: 0.85rem; font-weight: 600;
    }

    main{
        padding: calc(var(--header-h) + clamp(1.5rem, 5vw, 3rem)) clamp(1rem, 4vw, 2rem) clamp(2rem, 6vw, 4rem);
        max-width: var(--content-max); margin: 0 auto;
        margin:auto;
    }
    .page-header{ display: flex; flex-direction: column; gap: 0.4rem; margin-bottom: var(--gap-lg); }
    .page-header h1{ font-size: clamp(1.6rem, 4vw, 2.2rem); margin: 0; }
    .page-header p{ margin: 0; color: var(--muted); }

    /* Tabs */
    .tabs{
        display: flex; gap: 0.4rem; margin-bottom: var(--gap-md);
        border-bottom: 1px solid var(--border); flex-wrap: wrap;
    }
    .tab{
        background: transparent; border: none; color: var(--muted);
        padding: 0.6rem 0.9rem; font-size: 0.95rem; font-weight: 600;
        border-bottom: 2px solid transparent; margin-bottom: -1px;
    }
    .tab.is-active{ color: var(--fg); border-bottom-color: var(--fg); }

    form.upload-form{
        display: grid; gap: var(--gap-md);
        background: var(--card-bg); border: 1px solid var(--border);
        border-radius: var(--radius-md); padding: clamp(1rem, 3vw, 1.75rem);
        box-shadow: 0 4px 14px rgba(0,0,0,0.04);
    }
    .field{ display: flex; flex-direction: column; gap: 0.35rem; }
    .field label{ font-size: 0.85rem; font-weight: 600; }
    .field .hint{ font-size: 0.75rem; color: var(--muted); }
    .field input[type="email"],
    .field input[type="password"],
    .field input[type="text"],
    .field input[type="url"],
    .field input[type="number"],
    .field input[type="datetime-local"],
    .field select,
    .field textarea{
        padding: 0.6rem 0.7rem; border-radius: var(--radius-sm);
        border: 1px solid var(--border); background: var(--card-bg); color: var(--fg);
        font-size: 0.95rem; width: 100%; font-family: inherit;
    }
    .field textarea{ min-height: 90px; resize: vertical; }
    .field input[type="file"]{ padding: 0.4rem 0; font-size: 0.9rem; color: var(--fg); }

    .row-2{ display: grid; grid-template-columns: 1fr 1fr; gap: var(--gap-md); }
    @media (max-width: 600px){ .row-2{ grid-template-columns: 1fr; } }

    .checkbox-grid{
        display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        gap: 0.4rem;
    }
    .checkbox-grid label{
        display: flex; align-items: center; gap: 0.4rem;
        font-size: 0.85rem; font-weight: 500;
        background: var(--chip-bg); border: 1px solid var(--border);
        border-radius: var(--radius-sm); padding: 0.45rem 0.6rem; cursor: pointer;
    }

    .actions{ display: flex; gap: 0.5rem; justify-content: flex-end; flex-wrap: wrap; }
    .btn{
        width:120px;
        border-radius: var(--radius-sm); border: 2px solid var(--fg);
        padding: 0.55rem 1rem; font-size: 0.95rem; font-weight: 600;
        background: var(--card-bg); color: var(--fg);
        transition: transform 0.15s ease, filter 0.15s ease;
        
    }
    .btn:hover{ filter: invert(1); transform: scale(1.03); }
    .btn.primary{ background: var(--fg); color: var(--bg); }

    .feedback{
        padding: 0.7rem 0.85rem; border-radius: var(--radius-sm);
        font-size: 0.9rem; display: none; margin-bottom: var(--gap-md);
    }
    .feedback.is-visible{ display: block; }
    .feedback.success{ background: #ecfdf5; color: #065f46; border: 1px solid #6ee7b7; }
    .feedback.error  { background: #fef2f2; color: #991b1b; border: 1px solid #fca5a5; }
    [data-theme="dark"] .feedback.success{ background: #052e22; color: #a7f3d0; border-color: #065f46; }
    [data-theme="dark"] .feedback.error  { background: #3b0d0d; color: #fecaca; border-color: #7f1d1d; }

    .pane{ display: none; }
    .pane.is-active{ display: block; }