/* style.css – LeetMetric Premium SaaS Dashboard */
:root {
    --lm-bg-primary: #1a1d24;
    --lm-bg-secondary: #23272e;
    --lm-bg-tertiary: #2c3139;
    --lm-bg-glass: rgba(35, 39, 46, 0.65);
    --lm-bg-card: #2c3139;
    --lm-text-primary: #f5f7fa;
    --lm-text-secondary: #a6adb8;
    --lm-text-tertiary: #7a8290;
    --lm-accent-primary: #5a8a6f;
    --lm-accent-light: #9db59d;
    --lm-accent-gradient: linear-gradient(135deg, #4a6741 0%, #9db59d 100%);
    --lm-easy-color: #6b8e5f;
    --lm-medium-color: #a8956a;
    --lm-hard-color: #8b4a4a;
    --lm-border-color: #3a3f47;
    --lm-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.12);
    --lm-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.18);
    --lm-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.25);
    --lm-radius-sm: 8px;
    --lm-radius-md: 12px;
    --lm-radius-lg: 16px;
    --lm-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --lm-spacing: 1.5rem;
    --lm-spacing-sm: 0.75rem;
}

[data-theme="light"] {
    --lm-bg-primary: #f8f9fb;
    --lm-bg-secondary: #eff0f3;
    --lm-bg-tertiary: #e8eaef;
    --lm-bg-glass: rgba(239, 240, 243, 0.85);
    --lm-bg-card: #f5f6fa;
    --lm-text-primary: #1a1d24;
    --lm-text-secondary: #5a6270;
    --lm-text-tertiary: #7a8290;
    --lm-border-color: #d5d8e0;
    --lm-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --lm-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --lm-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
}

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

html, body {
    height: 100%;
    width: 100%;
}

body {
    background: var(--lm-bg-primary);
    color: var(--lm-text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Root Container */
.lm-root {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 900px;
    margin: 0 auto;
    background: var(--lm-bg-primary);
    position: relative;
}

.lm-noise {
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' seed='2'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23noiseFilter)' opacity='0.03'/%3E%3C/svg%3E");
    background-size: 200px 200px;
    z-index: 0;
}

/* Header */
.lm-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--lm-spacing);
    background: var(--lm-bg-glass);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--lm-border-color);
    position: relative;
    z-index: 10;
}

.lm-logo-area {
    display: flex;
    align-items: center;
    gap: var(--lm-spacing-sm);
}

.lm-logo {
    display: block;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.lm-logo-text h1 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--lm-text-primary);
    margin: 0;
    line-height: 1;
}

.lm-logo-text p {
    font-size: 0.75rem;
    color: var(--lm-text-secondary);
    margin: 0.2rem 0 0 0;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.lm-theme-btn {
    background: var(--lm-bg-secondary);
    border: 1px solid var(--lm-border-color);
    border-radius: var(--lm-radius-sm);
    padding: 0.5rem 0.6rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--lm-transition);
    color: var(--lm-text-primary);
}

.lm-theme-btn:hover {
    background: var(--lm-bg-tertiary);
    box-shadow: var(--lm-shadow-sm);
}

.lm-theme-btn:focus-visible {
    outline: 2px solid var(--lm-accent-primary);
    outline-offset: 2px;
}

.lm-theme-icon {
    width: 20px;
    height: 20px;
    display: inline-block;
    background-size: contain;
}

[data-theme="dark"] .lm-theme-icon {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%239db59d'%3E%3Cpath d='M21 12a9 9 0 11-18 0 9 9 0 0118 0z'/%3E%3C/svg%3E");
}

[data-theme="light"] .lm-theme-icon {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%235a8a6f'%3E%3Cpath d='M12 3v1m0 16v1m9-9h-1M4 12H3m15.364 6.364l-.707-.707M6.343 6.343l-.707-.707m12.728 0l-.707.707M6.343 17.657l-.707.707M16 12a4 4 0 11-8 0 4 4 0 018 0z'/%3E%3C/svg%3E");
}

/* Main Content */
.lm-main {
    flex: 1;
    padding: var(--lm-spacing);
    display: flex;
    flex-direction: column;
    gap: var(--lm-spacing);
    position: relative;
    z-index: 1;
}

/* Search Section */
.lm-search-section {
    background: var(--lm-bg-card);
    border: 1px solid var(--lm-border-color);
    border-radius: var(--lm-radius-lg);
    padding: var(--lm-spacing);
    box-shadow: var(--lm-shadow-sm);
}

.lm-search-form {
    display: flex;
    flex-direction: column;
    gap: var(--lm-spacing-sm);
}

.lm-search-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--lm-text-secondary);
    letter-spacing: 0.3px;
}

.lm-search-row {
    display: flex;
    gap: var(--lm-spacing-sm);
}

#user-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--lm-bg-secondary);
    border: 1px solid var(--lm-border-color);
    border-radius: var(--lm-radius-sm);
    color: var(--lm-text-primary);
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 1rem;
    transition: all var(--lm-transition);
}

#user-input:focus {
    outline: none;
    border-color: var(--lm-accent-primary);
    background: var(--lm-bg-tertiary);
    box-shadow: 0 0 0 3px rgba(90, 138, 111, 0.1);
}

#user-input::placeholder {
    color: var(--lm-text-tertiary);
}

/* Buttons */
.lm-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--lm-radius-sm);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--lm-transition);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.lm-btn-primary {
    background: var(--lm-accent-gradient);
    color: #fff;
    box-shadow: 0 4px 12px rgba(90, 138, 111, 0.25);
}

.lm-btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(90, 138, 111, 0.35);
}

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

.lm-btn-secondary {
    background: var(--lm-bg-secondary);
    color: var(--lm-accent-primary);
    border: 1.5px solid var(--lm-accent-primary);
}

.lm-btn-secondary:hover:not(:disabled) {
    background: var(--lm-bg-tertiary);
    box-shadow: var(--lm-shadow-md);
    transform: translateY(-1px);
}

.lm-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.lm-btn:focus-visible {
    outline: 2px solid var(--lm-accent-primary);
    outline-offset: 2px;
}

.lm-spinner {
    display: none;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.lm-btn[aria-busy="true"] .lm-btn-text {
    display: none;
}

.lm-btn[aria-busy="true"] .lm-spinner {
    display: inline-block;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Empty State */
.lm-empty-state {
    text-align: center;
    padding: 3rem var(--lm-spacing);
    color: var(--lm-text-secondary);
    animation: fade-in 0.5s ease-out;
}

.lm-empty-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 1rem;
}

.lm-empty-state p {
    font-size: 1.1rem;
}

/* Error State */
.lm-error-state {
    background: var(--lm-bg-card);
    border: 1px solid var(--lm-border-color);
    border-radius: var(--lm-radius-lg);
    padding: var(--lm-spacing);
    text-align: center;
    animation: fade-in 0.5s ease-out;
}

.lm-error-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--lm-spacing-sm);
    color: #8b4a4a;
}

#lm-error-msg {
    color: #a8765a;
    margin-bottom: var(--lm-spacing-sm);
    font-weight: 500;
}

/* Skeleton Loader */
.lm-skeleton {
    display: flex;
    flex-direction: column;
    gap: var(--lm-spacing);
    animation: fade-in 0.3s ease-out;
}

.lm-skeleton-rings {
    display: flex;
    justify-content: center;
    gap: var(--lm-spacing);
    flex-wrap: wrap;
}

.lm-skeleton-rings::before,
.lm-skeleton-rings::after {
    content: '';
    width: 110px;
    height: 110px;
    border-radius: 50%;
    background: var(--lm-bg-tertiary);
    animation: shimmer 1.8s infinite;
}

.lm-skeleton-card {
    height: 240px;
    background: var(--lm-bg-tertiary);
    border-radius: var(--lm-radius-lg);
    animation: shimmer 1.8s infinite;
}

@keyframes shimmer {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

@keyframes fade-in {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Stats Container */
.stats-container {
    display: flex;
    flex-direction: column;
    gap: var(--lm-spacing);
    animation: fade-in 0.6s ease-out;
}

/* Progress Section */
.lm-progress-section {
    background: var(--lm-bg-card);
    border: 1px solid var(--lm-border-color);
    border-radius: var(--lm-radius-lg);
    padding: var(--lm-spacing);
    box-shadow: var(--lm-shadow-sm);
}

.lm-section-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--lm-text-primary);
    margin-bottom: var(--lm-spacing);
}

.progress {
    display: flex;
    justify-content: center;
    gap: var(--lm-spacing);
    flex-wrap: wrap;
}

.progress-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--lm-spacing-sm);
}

/* Circle Progress */
.circle {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--lm-bg-secondary);
    border: 3px solid;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2), var(--lm-shadow-sm);
    transition: transform var(--lm-transition), box-shadow var(--lm-transition);
}

.circle:hover {
    transform: scale(1.05);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2), var(--lm-shadow-md);
}

.circle::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: conic-gradient(var(--circle-color, #6b8e5f) calc(var(--progress-degree, 0) * 3.6deg), transparent 0);
    transition: background 1.2s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 0;
}

.easy-progress {
    border-color: var(--lm-easy-color);
    --circle-color: #6b8e5f;
}

.medium-progress {
    border-color: var(--lm-medium-color);
    --circle-color: #a8956a;
}

.hard-progress {
    border-color: var(--lm-hard-color);
    --circle-color: #8b4a4a;
}

.circle-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--lm-text-primary);
    position: relative;
    z-index: 1;
    font-variant-numeric: tabular-nums;
}

.circle-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--lm-text-secondary);
    position: relative;
    z-index: 1;
    margin: 0;
}

/* Overview Section */
.lm-overview-section {
    background: var(--lm-bg-card);
    border: 1px solid var(--lm-border-color);
    border-radius: var(--lm-radius-lg);
    padding: var(--lm-spacing);
    box-shadow: var(--lm-shadow-sm);
}

/* Stats Card */
.stats-card {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--lm-spacing-sm);
    margin-bottom: var(--lm-spacing);
}

.card-item {
    background: var(--lm-bg-secondary);
    border: 1px solid var(--lm-border-color);
    border-radius: var(--lm-radius-sm);
    padding: 1.2rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    transition: all var(--lm-transition);
}

.card-item:hover {
    background: var(--lm-bg-tertiary);
    transform: translateY(-4px);
    box-shadow: var(--lm-shadow-md);
    border-color: var(--lm-accent-primary);
}

.item-label {
    font-size: 0.8rem;
    color: var(--lm-text-secondary);
    font-weight: 600;
    letter-spacing: 0.3px;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.item-value {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--lm-accent-light);
    font-variant-numeric: tabular-nums;
}

/* Card Actions */
.lm-card-actions {
    display: flex;
    gap: var(--lm-spacing-sm);
    margin-top: var(--lm-spacing);
}

/* Footer */
.lm-footer {
    text-align: center;
    padding: var(--lm-spacing);
    color: var(--lm-text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--lm-border-color);
    position: relative;
    z-index: 1;
}

.lm-footer a {
    color: var(--lm-accent-light);
    text-decoration: none;
    transition: color var(--lm-transition);
}

.lm-footer a:hover {
    color: var(--lm-accent-primary);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .lm-root {
        max-width: 100vw;
    }

    .lm-main {
        padding: var(--lm-spacing-sm);
    }

    .lm-header {
        padding: var(--lm-spacing-sm);
    }

    .lm-logo-text h1 {
        font-size: 1.2rem;
    }

    .lm-search-row {
        flex-direction: column;
    }

    #user-input {
        width: 100%;
    }

    .lm-btn {
        width: 100%;
        justify-content: center;
    }

    .progress {
        gap: var(--lm-spacing-sm);
    }

    .circle {
        width: 90px;
        height: 90px;
    }

    .circle-value {
        font-size: 1.5rem;
    }

    .stats-card {
        grid-template-columns: repeat(2, 1fr);
    }

    .lm-card-actions {
        flex-direction: column;
    }

    .lm-card-actions .lm-btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    :root {
        --lm-spacing: 1rem;
        --lm-spacing-sm: 0.5rem;
    }

    .lm-header {
        padding: var(--lm-spacing-sm);
        flex-wrap: wrap;
    }

    .lm-logo-area {
        gap: 0.5rem;
    }

    .lm-logo {
        width: 36px;
        height: 36px;
    }

    .lm-logo-text h1 {
        font-size: 1rem;
    }

    .lm-logo-text p {
        font-size: 0.65rem;
    }

    .lm-search-section {
        padding: var(--lm-spacing-sm);
    }

    .lm-main {
        padding: var(--lm-spacing-sm);
        gap: var(--lm-spacing-sm);
    }

    .circle {
        width: 70px;
        height: 70px;
    }

    .circle-value {
        font-size: 1.2rem;
    }

    .circle-label {
        font-size: 0.75rem;
    }

    .lm-progress-section,
    .lm-overview-section {
        padding: var(--lm-spacing-sm);
    }

    .lm-section-title {
        font-size: 1rem;
        margin-bottom: var(--lm-spacing-sm);
    }

    .stats-card {
        grid-template-columns: 1fr;
        gap: var(--lm-spacing-xs);
    }

    .card-item {
        padding: 0.9rem 0.8rem;
    }
}

/* Accessibility */
:focus-visible {
    outline: 2px solid var(--lm-accent-primary);
    outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}