/* File: style.css */

@layer reset, tokens, base, components, utilities, motion;

@layer reset {
    *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
    button { font: inherit; color: inherit; background: none; border: none; }
    input, textarea, select { font: inherit; color: inherit; }
    img, svg { display: block; max-width: 100%; }
}

@layer tokens {
    :root {
        --bg-color: #F8F9FA;
        --text-main: #1A1A1A;
        --text-muted: #555555;
        --primary-color: #0056B3;
        --primary-hover: #004494;
        --primary-contrast: #FFFFFF;
        --danger-color: #C62828;
        --danger-hover: #B71C1C;
        --surface-color: #FFFFFF;
        --border-color: #DDDDDD;
        --border-hover: #CCCCCC;
        --focus-ring: rgba(0, 86, 179, 0.30);
        --info-bg: #FFF3CD;
        --info-text: #664D03;
        --info-border: #FFEEBA;
        --error-bg: #F8D7DA;
        --error-text: #721C24;
        --error-border: #F5C6CB;
        --toast-bg: #1A1A1A;
        --toast-text: #FFFFFF;

        --font-family: 'Segoe UI', system-ui, -apple-system, 'Noto Sans Bengali', sans-serif;
        --fs-base: 112.5%;
        --lh-base: 1.6;

        --space-1: 0.5rem;
        --space-2: 1rem;
        --space-3: 1.5rem;
        --space-4: 2rem;

        --radius-sm: 4px;
        --radius-md: 8px;

        --transition-speed: 0.25s;
        --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
    }

    @media (prefers-color-scheme: dark) {
        :root {
            --bg-color: #121212;
            --text-main: #E0E0E0;
            --text-muted: #A0A0A0;
            --primary-color: #66B2FF;
            --primary-hover: #99CCFF;
            --primary-contrast: #0A1929;
            --danger-color: #D32F2F;
            --danger-hover: #FF6B6B;
            --surface-color: #1E1E1E;
            --border-color: #333333;
            --border-hover: #444444;
            --focus-ring: rgba(102, 178, 255, 0.40);
            --info-bg: #4D4529;
            --info-text: #FFE69C;
            --info-border: #665D33;
            --error-bg: #4A1920;
            --error-text: #FFB3B8;
            --error-border: #8C2A35;
            --toast-bg: #E0E0E0;
            --toast-text: #121212;
        }
    }
}

@layer base {
    html { scroll-behavior: smooth; }

    body {
        background-color: var(--bg-color);
        color: var(--text-main);
        font-family: var(--font-family);
        font-size: var(--fs-base);
        line-height: var(--lh-base);
        display: flex;
        flex-direction: column;
        min-height: 100vh;
        min-height: 100dvh;
        -webkit-font-smoothing: antialiased;
        text-rendering: optimizeLegibility;
    }

    *:focus-visible {
        outline: 3px solid var(--primary-color);
        outline-offset: 3px;
        border-radius: var(--radius-sm);
    }

    #main-content:focus { outline: none; }

    .sr-only {
        position: absolute;
        width: 1px; height: 1px;
        padding: 0; margin: -1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        white-space: nowrap;
        border: 0;
    }

    .sr-only-focusable:focus,
    .sr-only-focusable:active {
        position: static;
        width: auto;
        height: auto;
        overflow: visible;
        clip: auto;
        white-space: normal;
        display: inline-block;
        padding: 0.5rem 1rem;
        background: var(--primary-color);
        color: var(--primary-contrast);
        border-radius: var(--radius-sm);
        margin-top: 0.5rem;
    }

    .skip-link {
        position: absolute;
        top: -100px; left: 0;
        background: var(--primary-color);
        color: var(--primary-contrast);
        padding: 10px 15px;
        z-index: 9999;
        text-decoration: none;
        font-weight: bold;
        border-bottom-right-radius: var(--radius-sm);
        transition: top var(--transition-speed) var(--transition-ease);
    }
    .skip-link:focus { top: 0; }

    .noscript-banner {
        background-color: var(--danger-color);
        color: #FFFFFF;
        text-align: center;
        padding: 1rem;
        font-weight: bold;
    }
}

@layer components {
    .container { width: 90%; max-width: 1000px; margin: 0 auto; padding: 1.5rem 0; }

    .main-header {
        background-color: var(--surface-color);
        border-bottom: 2px solid var(--border-color);
        padding: 1rem 0;
    }
    .main-header .container { display: flex; justify-content: space-between; align-items: center; padding: 0; }
    .site-title {
        font-size: 1.8rem;
        font-weight: 700;
        color: var(--primary-color);
        cursor: pointer;
        padding: 0.25rem 0.5rem;
        border-radius: var(--radius-sm);
        transition: background-color var(--transition-speed) var(--transition-ease);
    }
    .site-title:hover { background-color: var(--bg-color); }

    .main-footer {
        margin-top: auto;
        text-align: center;
        padding: 1.5rem;
        background-color: var(--surface-color);
        border-top: 2px solid var(--border-color);
        font-size: 0.9rem;
        color: var(--text-muted);
    }

    .toast-region {
        position: fixed;
        bottom: 1.5rem;
        left: 50%;
        transform: translateX(-50%);
        z-index: 10000;
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
        pointer-events: none;
        width: min(90%, 420px);
    }
    .toast {
        background-color: var(--toast-bg);
        color: var(--toast-text);
        padding: 0.9rem 1.2rem;
        border-radius: var(--radius-md);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
        font-weight: 600;
        text-align: center;
        opacity: 0;
        transform: translateY(12px);
        pointer-events: auto;
        transition: opacity var(--transition-speed) var(--transition-ease),
                    transform var(--transition-speed) var(--transition-ease);
    }
    .toast.toast--error { background-color: var(--danger-color); color: #FFFFFF; }
    .toast.is-visible { opacity: 1; transform: translateY(0); }

    .content-section {
        margin-bottom: 3rem;
        background-color: var(--surface-color);
        padding: 2rem;
        border-radius: var(--radius-md);
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    }

    .section-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 1rem;
        margin-bottom: 1.5rem;
        border-bottom: 2px solid var(--border-color);
        padding-bottom: 0.5rem;
    }
    .section-heading {
        font-size: 1.5rem;
        color: var(--primary-color);
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
    }

    .dynamic-content-wrapper { font-size: 1.1rem; }
    .dynamic-content-wrapper p { margin-bottom: 1rem; }

    .empty-msg {
        color: var(--text-muted);
        font-style: italic;
        text-align: center;
        padding: 2rem;
        background-color: var(--bg-color);
        border-radius: var(--radius-sm);
    }

    .loader {
        text-align: center;
        padding: 2rem;
        color: var(--primary-color);
        font-weight: bold;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 1rem;
    }
    .loader::before {
        content: "";
        width: 40px; height: 40px;
        border: 4px solid var(--border-color);
        border-top-color: var(--primary-color);
        border-radius: 50%;
        animation: spin 1s linear infinite;
    }
    @keyframes spin { to { transform: rotate(360deg); } }

    .nav-cards-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        gap: 1.5rem;
    }
    .nav-card {
        background-color: var(--surface-color);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        padding: 1.5rem;
        text-align: center;
        cursor: pointer;
        color: inherit;
        width: 100%;
        transition: transform var(--transition-speed) var(--transition-ease),
                    box-shadow var(--transition-speed) var(--transition-ease),
                    border-color var(--transition-speed) var(--transition-ease);
    }
    .nav-card:hover,
    .nav-card:focus-visible {
        transform: translateY(-4px);
        box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
        border-color: var(--primary-color);
    }
    .card-body { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
    .card-icon { font-size: 2.5rem; color: var(--primary-color); }
    .card-title { font-size: 1.3rem; font-weight: 700; color: var(--text-main); }

    .folder-entry-btn {
        background: transparent;
        border: none;
        cursor: pointer;
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        padding: 0.5rem;
        color: var(--text-main);
        font-size: 1.05rem;
        border-radius: var(--radius-sm);
        text-align: left;
    }
    .folder-entry-btn:hover { background-color: var(--bg-color); }
    .folder-entry-btn .fa-folder { color: var(--primary-color); }

    .post-block {
        margin-bottom: 1rem;
        padding: 1rem;
        background-color: var(--bg-color);
        border-radius: var(--radius-md);
        border-left: 4px solid var(--primary-color);
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
    }
    .post-title-btn {
        background: none;
        border: none;
        font-size: 1.2rem;
        font-weight: bold;
        color: var(--primary-color);
        cursor: pointer;
        text-align: left;
        padding: 0.25rem 0;
        text-decoration: underline;
        text-underline-offset: 3px;
    }
    .post-title-btn:hover { text-decoration-thickness: 2px; }
    .post-author { font-size: 0.9rem; color: var(--text-muted); }

    .read-nav-buttons {
        display: flex;
        justify-content: space-between;
        gap: 1rem;
        margin-top: 3rem;
        padding-top: 1.5rem;
        border-top: 2px solid var(--border-color);
        flex-wrap: wrap;
    }
    .read-nav-btn { flex: 1 1 45%; min-width: 200px; padding: 1rem; font-size: 1.05rem; }
    .read-nav-btn:disabled { opacity: 0.5; cursor: not-allowed; border-color: transparent; }

    button, .btn-link {
        cursor: pointer;
        font-family: inherit;
        font-size: 1rem;
        font-weight: 600;
        border: none;
        border-radius: var(--radius-sm);
        padding: 0.6rem 1.2rem;
        min-height: 48px;
        transition: background-color var(--transition-speed) var(--transition-ease),
                    color var(--transition-speed) var(--transition-ease),
                    border-color var(--transition-speed) var(--transition-ease);
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        text-decoration: none;
    }
    .btn-primary, .btn-link { background-color: var(--primary-color); color: var(--primary-contrast); }
    .btn-primary:hover, .btn-link:hover { background-color: var(--primary-hover); }

    .btn-secondary { background-color: var(--border-color); color: var(--text-main); border: 2px solid transparent; }
    .btn-secondary:hover:not(:disabled) { background-color: var(--border-hover); color: var(--text-main); }

    .btn-danger { background-color: var(--danger-color); color: #FFFFFF; }
    .btn-danger:hover:not(:disabled) { background-color: var(--danger-hover); }

    .btn-admin {
        background-color: transparent;
        color: var(--primary-color);
        border: 2px solid var(--primary-color);
        min-height: 44px;
        padding: 0.4rem 0.8rem;
    }
    .btn-admin:hover { background-color: var(--primary-color); color: var(--primary-contrast); }

    .btn-icon {
        background: transparent;
        color: var(--text-muted);
        font-size: 1.2rem;
        padding: 0.5rem;
        min-height: 44px;
        min-width: 44px;
    }
    .btn-icon:hover { color: var(--primary-color); }

    .nav-buttons-wrapper { display: flex; flex-direction: column; gap: 0.5rem; max-width: 250px; }

    .breadcrumb-container {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 0.3rem;
        padding: 0.8rem 0;
        margin-bottom: 1.5rem;
        border-bottom: 1px solid var(--border-color);
    }
    .breadcrumb-btn {
        background: none;
        border: none;
        color: var(--primary-color);
        font-size: 1rem;
        font-family: inherit;
        font-weight: 600;
        cursor: pointer;
        padding: 0.2rem 0.5rem;
        border-radius: var(--radius-sm);
        text-decoration: underline;
        text-underline-offset: 2px;
        transition: background-color var(--transition-speed) var(--transition-ease);
    }
    .breadcrumb-btn:hover:not(.breadcrumb-active) {
        background-color: var(--primary-color);
        color: var(--primary-contrast);
        text-decoration: none;
    }
    .breadcrumb-active { color: var(--text-muted); text-decoration: none; cursor: default; }
    .breadcrumb-separator { color: var(--text-muted); font-weight: bold; user-select: none; }

    .contact-item-block { display: flex; flex-direction: column; gap: 0.5rem; }

    .login-wrapper { flex: 1; display: flex; align-items: center; justify-content: center; min-height: 60vh; }
    .login-card { max-width: 450px; width: 100%; margin: auto; }
    .login-error {
        background-color: var(--error-bg);
        color: var(--error-text);
        padding: 0.8rem;
        border-radius: var(--radius-sm);
        margin-bottom: 1rem;
        border: 1px solid var(--error-border);
        font-weight: bold;
        text-align: center;
    }
    .login-buttons { flex-direction: column; margin-top: 0; }

    #admin-indicator {
        background-color: var(--info-bg);
        color: var(--info-text);
        padding: 1rem;
        border-radius: var(--radius-sm);
        margin-bottom: 2rem;
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 1rem;
        font-weight: bold;
        border: 1px solid var(--info-border);
    }

    .custom-modal {
        margin: auto;
        border: none;
        border-radius: var(--radius-md);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
        max-width: 500px;
        width: 90%;
        background-color: var(--surface-color);
        color: var(--text-main);
        padding: 0;
    }
    .custom-modal::backdrop { background-color: rgba(0, 0, 0, 0.7); backdrop-filter: blur(3px); }
    .modal-content { padding: 2rem; }
    .modal-title {
        margin-bottom: 1.5rem;
        color: var(--primary-color);
        font-size: 1.4rem;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 0.5rem;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }
    .delete-warning-icon { font-size: 3rem; color: var(--danger-color); }

    .form-group { margin-bottom: 1.2rem; position: relative; }
    .form-group label { display: block; margin-bottom: 0.4rem; font-weight: 600; }
    .form-group input[type="text"],
    .form-group input[type="url"],
    .form-group input[type="email"],
    .form-group input[type="password"],
    .form-group textarea {
        width: 100%;
        padding: 0.8rem;
        font-size: 1rem;
        font-family: inherit;
        border: 2px solid var(--border-color);
        border-radius: var(--radius-sm);
        background-color: var(--surface-color);
        color: var(--text-main);
        transition: border-color var(--transition-speed) var(--transition-ease),
                    box-shadow var(--transition-speed) var(--transition-ease);
    }
    .form-group input:focus,
    .form-group textarea:focus {
        border-color: var(--primary-color);
        outline: none;
        box-shadow: 0 0 0 3px var(--focus-ring);
    }
    
    .input-wrapper { position: relative; display: flex; align-items: center; }
    .input-wrapper input { padding-right: 3rem; }
    .password-toggle { position: absolute; right: 0.5rem; top: 50%; transform: translateY(-50%); height: auto; color: var(--text-muted); }

    .checkbox-group {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        background-color: var(--bg-color);
        padding: 1rem;
        border-radius: var(--radius-sm);
        border: 1px solid var(--border-color);
    }
    .checkbox-group input[type="checkbox"] { width: 20px; height: 20px; accent-color: var(--primary-color); flex-shrink: 0; }
    .checkbox-group label { margin-bottom: 0; cursor: pointer; }
    .modal-buttons { display: flex; justify-content: flex-end; gap: 1rem; margin-top: 2rem; }

    .form-group:focus-within label { color: var(--primary-color); font-weight: 700; }
}

@layer utilities {
    .hidden { display: none !important; }
    .mb-1 { margin-bottom: 1rem; }
    .mb-2 { margin-bottom: 2rem; }
    .mt-2 { margin-top: 2rem; }
    .mr-1 { margin-right: 0.5rem; }
    .text-center { text-align: center; }
    .flex-row { display: flex; align-items: center; }
    .gap-1 { gap: 1rem; }
    .flex-wrap { flex-wrap: wrap; }
    .w-100 { width: 100%; }
    .w-auto { width: auto; }
    .fw-bold { font-weight: bold; }
    .opacity-60 { opacity: 0.6; }
    .border-none { border: none; }
    .bg-transparent { background: transparent; }
    .cursor-pointer { cursor: pointer; }
    .text-primary { color: var(--primary-color) !important; }
    .text-danger { color: var(--danger-color) !important; }
    .text-muted { color: var(--text-muted) !important; }
    .text-italic { font-style: italic; }
    .justify-center { justify-content: center; }
    .icon-3xl { font-size: 3rem; }

    @media (min-width: 600px) {
        .nav-buttons-wrapper { flex-direction: row; max-width: 100%; }
    }

    @media (max-width: 600px) {
        .content-section { padding: 1.5rem 1rem; }
        .section-header { flex-direction: column; align-items: flex-start; }
        #admin-indicator { flex-direction: column; text-align: center; }
        .modal-buttons { flex-direction: column; }
        .modal-buttons button { width: 100%; }
    }

    @media (max-width: 500px) {
        .read-nav-btn { flex: 1 1 100%; min-width: 0; }
    }
}

@layer motion {
    @media (prefers-reduced-motion: reduce) {
        html { scroll-behavior: auto; }
        *, *::before, *::after {
            animation-duration: 0.01ms !important;
            animation-iteration-count: 1 !important;
            transition-duration: 0.01ms !important;
            scroll-behavior: auto !important;
            transform: none !important;
        }
        .loader::before { animation: none; border-top-color: var(--primary-color); }
    }
}