/* === Google Fonts === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');

/* === CSS Variables (Refined Dark Theme) === */
:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2c2c2c;
    --bg-tertiary: #3a3a3a;
    --text-primary: #f0f0f0;
    --text-secondary: #b0b0b0;
    --accent-primary: #007bff;
    --accent-hover: #0056b3;
    --danger-primary: #dc3545;
    --danger-hover: #c82333;
    --success-primary: #28a745;
    --border-color: #4a4a4a;
    --font-family: 'Inter', sans-serif;
    --border-radius: 12px;
    --box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5);
}

/* === Global Styles === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.6;
    padding: 1.5rem;
    min-height: 100vh; /* Added for vertical centering */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* === Main Layout & Header === */
.main-layout {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center; /* Added for vertical centering */
    width: 100%;
    flex-grow: 1; /* Allow it to take available space */
}

.site-header {
    width: 100%;
    max-width: 900px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.site-header .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.site-header .logo a {
    color: inherit;
    text-decoration: none;
}

/* === Main Container === */
.container {
    width: 100%;
    max-width: 900px;
    background-color: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* === Typography === */
h1, h2 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-weight: 700;
    text-align: left;
}

h1 {
    font-size: 2.2rem;
}

h2 {
    font-size: 1.6rem;
    margin-top: 2.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* === Forms === */
.form-section {
    background-color: var(--bg-tertiary);
    padding: 2rem;
    border-radius: var(--border-radius);
}

form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

input[type="url"],
input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 0.8rem 1.2rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-family);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(0, 123, 255, 0.25);
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-start;
    margin-top: 1rem;
}

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: background-color 0.2s ease, transform 0.1s ease, box-shadow 0.2s ease;
}

.btn-primary {
    background-color: var(--accent-primary);
    color: white;
    box-shadow: 0 2px 4px rgba(0, 123, 255, 0.2);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    text-decoration: none;
    box-shadow: 0 4px 8px rgba(0, 123, 255, 0.3);
}

.btn:active {
    transform: translateY(2px);
}

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

.btn-danger:hover {
    background-color: var(--danger-hover);
    text-decoration: none;
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: #4a4a4a;
    text-decoration: none;
}

/* === Table Styles === */
.table-container {
    overflow-x: auto;
    margin-top: 2rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-tertiary);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    table-layout: fixed;
}

.data-table .th-alias { width: 20%; }
.data-table .th-url { width: 40%; }
.data-table .th-visits { width: 10%; }
.data-table .th-status { width: 15%; }
.data-table .th-actions { width: 15%; }

.data-table th,
.data-table td {
    padding: 1rem 1.2rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    font-weight: 600;
    color: var(--text-primary);
    background-color: rgba(0,0,0,0.1);
}

.data-table tbody tr {
    transition: background-color 0.2s ease;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.data-table tbody tr:hover {
    background-color: var(--bg-secondary);
}

.data-table td:first-child a,
.data-table .col-url a {
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.data-table .actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.actions .btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    display: flex;
    align-items: center;
    border-radius: 6px;
    transition: background-color 0.2s ease;
}

.actions .btn-icon:hover {
    background-color: var(--bg-primary);
}

.actions .btn-icon svg {
    width: 20px;
    height: 20px;
    stroke: var(--text-secondary);
    transition: stroke 0.2s ease;
}

.actions .btn-icon:hover svg {
    stroke: var(--text-primary);
}

/* === Utility & Message Styles === */
.error-message {
    color: var(--danger-primary);
    background-color: rgba(220, 53, 69, 0.1);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    margin-bottom: 1.5rem;
    border: 1px solid var(--danger-primary);
}

.message-box {
    text-align: center;
    max-width: 600px;
    margin: auto;
}

.message-box h1 {
    color: var(--accent-primary);
    text-align: center;
}

.hint {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 1.5rem;
}

/* === Modal Styles === */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    position: relative;
    width: 90%;
    max-width: 450px;
    text-align: center;
    transform: translateY(-20px);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.modal-overlay.visible .modal-content {
    transform: translateY(0);
    opacity: 1;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s ease, transform 0.2s ease;
}

.modal-close:hover {
    color: var(--text-primary);
    transform: rotate(90deg);
}

#qr-code-container {
    margin: 1.5rem 0;
    padding: 1rem;
    background-color: white;
    border-radius: 8px;
    display: inline-block;
}

#qr-code-container img {
    display: block;
    width: 100%;
    max-width: 256px;
    height: auto;
}

/* === Copy Success Popup === */
.copy-popup {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--success-primary);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 1000;
}

.copy-popup.show {
    opacity: 1;
    visibility: visible;
}

/* === Responsive Design === */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem;
    }

    h1 {
        font-size: 1.8rem;
    }
    h2 {
        font-size: 1.4rem;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    /* Responsive Table: Turn into cards */
    .table-container {
        border: none;
        background-color: transparent;
    }

    .data-table,
    .data-table thead,
    .data-table tbody,
    .data-table th,
    .data-table td,
    .data-table tr {
        display: block;
    }

    .data-table thead {
        display: none; /* Hide table headers */
    }

    .data-table tr {
        margin-bottom: 1.5rem;
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        padding: 1rem;
        background-color: var(--bg-tertiary);
    }
    
    .data-table td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0.8rem 0;
        border-bottom: 1px solid var(--border-color);
        width: 100% !important; /* Override fixed widths */
    }
    
    .data-table tr:last-child {
        margin-bottom: 0;
    }

    .data-table td:last-child {
        border-bottom: none;
    }

    .data-table td::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--text-primary);
        text-align: left;
        margin-right: 1rem;
        flex-shrink: 0;
    }

    /* --- KEY FIX: Stack long-text cells vertically --- */
    .data-table td[data-label="Alias"],
    .data-table td[data-label="Destination URL"] {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }

    .data-table td[data-label="Alias"] a,
    .data-table td[data-label="Destination URL"] a {
        white-space: normal;
        word-break: break-all;
        text-align: left;
        overflow: visible;
        text-overflow: initial;
        display: inline;
    }

    .data-table .actions {
        justify-content: flex-end;
    }
}

@media (max-width: 480px) {
    body {
        padding: 1rem;
    }
    .container {
        padding: 1rem;
    }
    h1 {
        font-size: 1.6rem;
    }
    .btn {
        padding: 0.7rem 1.5rem;
        font-size: 0.9rem;
    }
    .form-section {
        padding: 1.5rem;
    }
    .data-table tr {
        padding: 1rem;
    }
}