:root {
    --primary: #0984E3;
    --primary-hover: #076CBA;
    --secondary: #74B9FF;
    --accent: #FD79A8;
    --background: #0C1A2E;
    --surface: rgba(18, 32, 57, 0.7);
    --border: rgba(116, 185, 255, 0.15);

    --text-main: #FFFFFF;
    --text-muted: #8AA4C8;

    --color-added: #00b894;
    --color-added-bg: rgba(0, 184, 148, 0.15);
    --color-removed: #d63031;
    --color-removed-bg: rgba(214, 48, 49, 0.15);
    --color-changed: #feca57;
    --color-changed-bg: rgba(254, 202, 87, 0.15);

    --radius: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--background);
    color: var(--text-main);
    min-height: 100vh;
    padding: 2rem;
    overflow-x: hidden;
}

.glass-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 20% 20%, rgba(9, 132, 227, 0.1), transparent 40%),
        radial-gradient(circle at 80% 80%, rgba(253, 121, 168, 0.05), transparent 40%);
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.glass-panel {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(9, 132, 227, 0.3);
}

h1 {
    font-size: 1.4rem;
    font-weight: 600;
}

.subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.header-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 12px;
    color: var(--text-muted);
}

#search-input {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border);
    color: white;
    padding: 0.6rem 1rem 0.6rem 2.2rem;
    border-radius: 8px;
    outline: none;
    font-family: inherit;
    font-size: 0.9rem;
    width: 250px;
    transition: all 0.2s;
}

#search-input:focus {
    border-color: var(--primary);
    width: 280px;
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    outline: none;
    transition: all 0.2s;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.primary-btn {
    background: var(--primary);
    color: white;
    padding: 0.6rem 1.2rem;
}

.primary-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.icon-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.6rem 1rem;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Filter Bar */
.filter-bar {
    display: flex;
    gap: 1rem;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-muted);
    padding: 0 0.5rem;
}

.filter-btn {
    background: transparent;
    color: var(--text-muted);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    border: 1px solid transparent;
}

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

.filter-btn.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    border: 1px solid var(--border);
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.bg-added {
    background-color: var(--color-added);
}

.bg-removed {
    background-color: var(--color-removed);
}

.bg-changed {
    background-color: var(--color-changed);
}

/* Main Diff Area */
.diff-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.env-panel {
    display: flex;
    flex-direction: column;
}

.env-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.env-header h2 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.env-name-input {
    background: transparent;
    border: none;
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
    outline: none;
    border-bottom: 1px dashed transparent;
}

.env-name-input:focus,
.env-name-input:hover {
    border-bottom-color: var(--primary);
}

.upload-zone {
    padding: 4rem 2rem;
    text-align: center;
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s border;
    border: 2px dashed transparent;
    border-radius: 0 0 var(--radius) var(--radius);
}

.upload-zone:hover,
.upload-zone.dragover {
    background: rgba(9, 132, 227, 0.05);
    border-color: var(--primary);
}

.upload-zone svg {
    color: var(--primary);
    margin-bottom: 1rem;
}

.drop-subtext {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.hidden-input {
    display: none;
}

/* Diff View List */
.diff-view {
    margin-top: 1rem;
    overflow: hidden;
}

.hidden {
    display: none !important;
}

.diff-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 1px;
}

.diff-header>div {
    padding: 0.8rem 1.5rem;
}

.diff-header .right-col {
    border-left: 1px solid var(--border);
}

.diff-lines {
    max-height: 600px;
    overflow-y: auto;
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
}

.diff-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: background-color 0.2s;
}

.diff-row:hover {
    background: rgba(255, 255, 255, 0.03);
}

.diff-cell {
    padding: 0.8rem 1.5rem;
    word-break: break-all;
    position: relative;
    display: flex;
    flex-direction: column;
}

.diff-cell.right {
    border-left: 1px solid var(--border);
}

.var-key {
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 0.3rem;
    display: flex;
    justify-content: space-between;
}

.var-value {
    color: var(--text-main);
    display: inline-block;
    cursor: copy;
}

.var-value.masked {
    filter: blur(4px);
    user-select: none;
    transition: filter 0.2s;
}

.var-value.masked:hover:not(.copying) {
    filter: blur(0px);
}

.copy-icon {
    opacity: 0;
    color: var(--text-muted);
    transition: opacity 0.2s;
    cursor: pointer;
}

.diff-cell:hover .copy-icon {
    opacity: 1;
}

.copy-icon:hover {
    color: white;
}

.empty-cell {
    color: var(--text-muted);
    font-style: italic;
    opacity: 0.5;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Status Colors */
.row-added .right {
    background: var(--color-added-bg);
    border-left-color: var(--color-added);
}

.row-added .left {
    opacity: 0.5;
}

.row-removed .left {
    background: var(--color-removed-bg);
}

.row-removed .right {
    opacity: 0.5;
    border-left-color: var(--color-removed);
}

.row-changed .left {
    background: var(--color-changed-bg);
}

.row-changed .right {
    background: var(--color-changed-bg);
    border-left-color: var(--color-changed);
}

.status-badge {
    font-size: 0.7rem;
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    background: rgba(0, 0, 0, 0.3);
    margin-left: 0.5rem;
}

.row-added .status-badge {
    color: var(--color-added);
}

.row-removed .status-badge {
    color: var(--color-removed);
}

.row-changed .status-badge {
    color: var(--color-changed);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(116, 185, 255, 0.2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(116, 185, 255, 0.4);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-main);
    color: var(--background);
    padding: 0.8rem 1.5rem;
    border-radius: 30px;
    font-weight: 500;
    font-size: 0.9rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    transition: opacity 0.3s, transform 0.3s;
}

.toast.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
    pointer-events: none;
}

@media (max-width: 768px) {

    .diff-container,
    .diff-header,
    .diff-row {
        grid-template-columns: 1fr;
    }

    .diff-cell.right,
    .diff-header .right-col {
        border-left: none;
        border-top: 1px dashed var(--border);
    }

    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}