/* ===== CSS Variables & Design System ===== */
:root {
    /* Color Palette */
    --color-primary: hsl(260, 85%, 65%);
    --color-primary-dark: hsl(260, 85%, 55%);
    --color-primary-light: hsl(260, 85%, 75%);
    --color-secondary: hsl(200, 90%, 60%);
    --color-success: hsl(145, 70%, 55%);
    --color-warning: hsl(35, 95%, 60%);
    --color-danger: hsl(0, 80%, 60%);

    /* Background Colors */
    --bg-primary: hsl(240, 15%, 8%);
    --bg-secondary: hsl(240, 12%, 12%);
    --bg-card: hsla(240, 12%, 15%, 0.7);
    --bg-card-hover: hsla(240, 12%, 18%, 0.8);

    /* Text Colors */
    --text-primary: hsl(0, 0%, 95%);
    --text-secondary: hsl(0, 0%, 70%);
    --text-muted: hsl(0, 0%, 50%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(139, 92, 246, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ===== Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== Background Gradient ===== */
.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background:
        radial-gradient(circle at 20% 20%, hsla(260, 85%, 65%, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, hsla(200, 90%, 60%, 0.15) 0%, transparent 50%),
        var(--bg-primary);
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }
}

/* ===== Container ===== */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* ===== Header ===== */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInDown 0.6s ease;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.title-icon {
    font-size: 2.5rem;
    filter: drop-shadow(0 0 10px rgba(139, 92, 246, 0.5));
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
}

/* ===== Cards ===== */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid hsla(0, 0%, 100%, 0.1);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    animation: fadeInUp 0.6s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid hsla(0, 0%, 100%, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.card-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
}

.card-body {
    padding: var(--spacing-lg);
}

/* ===== Upload Area ===== */
.upload-area {
    border: 2px dashed hsla(0, 0%, 100%, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--color-primary);
    background: hsla(260, 85%, 65%, 0.05);
}

.upload-area.dragover {
    border-color: var(--color-primary);
    background: hsla(260, 85%, 65%, 0.1);
    transform: scale(1.02);
}

.upload-label {
    cursor: pointer;
    display: block;
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    animation: bounce 2s ease infinite;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.upload-text {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.upload-text strong {
    color: var(--color-primary);
}

.upload-hint {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===== Stats Row ===== */
.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.stat-item {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid hsla(0, 0%, 100%, 0.05);
    transition: all var(--transition-normal);
}

.stat-item:hover {
    transform: translateY(-2px);
    border-color: var(--color-primary);
}

.stat-label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-value.available {
    color: var(--color-success);
}

.stat-value.used {
    color: var(--text-muted);
}

/* ===== Result Display ===== */
.result-display {
    min-height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 2px solid hsla(0, 0%, 100%, 0.1);
    padding: var(--spacing-lg);
}

.result-placeholder {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.result-name {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: scaleIn 0.5s ease;
    text-align: center;
}

@keyframes scaleIn {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* ===== Buttons ===== */
.btn-primary,
.btn-secondary {
    font-family: 'Inter', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid hsla(0, 0%, 100%, 0.1);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.btn-icon {
    font-size: 1.2rem;
}

/* ===== Decision Buttons ===== */
.decision-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    animation: fadeInUp 0.4s ease;
}

.btn-confirm,
.btn-reject {
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn-confirm {
    background: linear-gradient(135deg, var(--color-success), hsl(145, 70%, 45%));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-confirm:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 20px hsla(145, 70%, 55%, 0.4);
}

.btn-reject {
    background: linear-gradient(135deg, var(--color-warning), hsl(35, 95%, 50%));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-reject:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 20px hsla(35, 95%, 60%, 0.4);
}

.btn-confirm:active,
.btn-reject:active {
    transform: translateY(0);
}

/* ===== Action Buttons ===== */
.action-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

/* ===== Filter Buttons ===== */
.filter-buttons {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.filter-btn {
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid hsla(0, 0%, 100%, 0.1);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--text-primary);
}

.filter-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* ===== Names List ===== */
.names-list {
    max-height: 400px;
    overflow-y: auto;
    padding-right: var(--spacing-xs);
}

.names-list::-webkit-scrollbar {
    width: 8px;
}

.names-list::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.names-list::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: var(--radius-sm);
}

.names-list::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}

.name-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid hsla(0, 0%, 100%, 0.05);
    transition: all var(--transition-fast);
    animation: fadeInLeft 0.3s ease;
}

.name-item:hover {
    background: var(--bg-card-hover);
    border-color: var(--color-primary);
    transform: translateX(5px);
}

.name-item.used {
    opacity: 0.5;
}

.name-item.used .name-text {
    text-decoration: line-through;
}

.name-text {
    font-weight: 500;
}

.name-badge {
    font-size: 0.8rem;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 600;
}

.name-badge.available {
    background: hsla(145, 70%, 55%, 0.2);
    color: var(--color-success);
}

.name-badge.used {
    background: hsla(0, 0%, 50%, 0.2);
    color: var(--text-muted);
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-hint {
    font-size: 0.9rem;
    margin-top: var(--spacing-xs);
}

/* ===== Animations ===== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

    .title {
        font-size: 2rem;
        flex-direction: column;
    }

    .card-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .filter-buttons {
        width: 100%;
    }

    .filter-btn {
        flex: 1;
    }

    .action-buttons {
        grid-template-columns: 1fr;
    }
}

/* ===== Action Buttons ===== */
.action-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

/* ===== Filter Buttons ===== */
.filter-buttons {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.filter-btn {
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid hsla(0, 0%, 100%, 0.1);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--text-primary);
}

.filter-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* ===== Names List ===== */
.names-list {
    max-height: 400px;
    overflow-y: auto;
    padding-right: var(--spacing-xs);
}

.names-list::-webkit-scrollbar {
    width: 8px;
}

.names-list::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.names-list::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: var(--radius-sm);
}

.names-list::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}

.name-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid hsla(0, 0%, 100%, 0.05);
    transition: all var(--transition-fast);
    animation: fadeInLeft 0.3s ease;
}

.name-item:hover {
    background: var(--bg-card-hover);
    border-color: var(--color-primary);
    transform: translateX(5px);
}

.name-item.used {
    opacity: 0.5;
}

.name-item.used .name-text {
    text-decoration: line-through;
}

.name-text {
    font-weight: 500;
}

.name-badge {
    font-size: 0.8rem;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 600;
}

.name-badge.available {
    background: hsla(145, 70%, 55%, 0.2);
    color: var(--color-success);
}

.name-badge.used {
    background: hsla(0, 0%, 50%, 0.2);
    color: var(--text-muted);
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-hint {
    font-size: 0.9rem;
    margin-top: var(--spacing-xs);
}

/* ===== Animations ===== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

    .title {
        font-size: 2rem;
        flex-direction: column;
    }

    .card-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .filter-buttons {
        width: 100%;
    }

    .filter-btn {
        flex: 1;
    }

    .action-buttons {
        grid-template-columns: 1fr;
    }

    .result-name {
        font-size: 2rem;
    }

    .decision-buttons {
        grid-template-columns: 1fr;
    }
}

/* ===== Search Container ===== */
.search-container {
    padding: var(--spacing-md);
    border-bottom: 1px solid hsla(0, 0%, 100%, 0.1);
}

.search-input {
    width: 100%;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid hsla(0, 0%, 100%, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px hsla(260, 85%, 65%, 0.1);
}

.search-input::placeholder {
    color: var(--text-muted);
}

/* ===== Name Item Edit Mode ===== */
.name-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
}

.name-edit-input {
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-primary);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    flex: 1;
}

.name-edit-input:focus {
    outline: none;
    box-shadow: 0 0 0 2px hsla(260, 85%, 65%, 0.2);
}

.name-actions {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.btn-edit,
.btn-save,
.btn-cancel,
.btn-delete,
.btn-toggle-status {
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-edit {
    background: var(--color-secondary);
    color: white;
}

.btn-edit:hover {
    background: hsl(200, 90%, 50%);
    transform: scale(1.05);
}

.btn-save {
    background: var(--color-success);
    color: white;
}

.btn-save:hover {
    background: hsl(145, 70%, 45%);
    transform: scale(1.05);
}

.btn-cancel {
    background: var(--text-muted);
    color: white;
}

.btn-cancel:hover {
    background: hsl(0, 0%, 40%);
    transform: scale(1.05);
}

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

.btn-delete:hover {
    background: hsl(0, 80%, 50%);
    transform: scale(1.05);
}

.btn-toggle-status {
    background: var(--color-warning);
    color: white;
}

.btn-toggle-status:hover {
    background: hsl(35, 95%, 50%);
    transform: scale(1.05);
}