/* Task Management Design System - Gradient & Glassmorphism */

:root {
    /* Gradient Background Colors (HSL) */
    --gradient-peach: 17 88% 86%;
    --gradient-orange: 24 100% 45%;
    --gradient-maroon: 359 97% 17%;
    --gradient-black: 0 0% 0%;
    
    /* Glassmorphism Surfaces */
    --background: 0 0% 5%;
    --foreground: 0 0% 95%;
    
    --card: 0 0% 100% / 0.05;
    --card-foreground: 0 0% 95%;
    
    --popover: 0 0% 8%;
    --popover-foreground: 0 0% 95%;
    
    --primary: 204 80% 53%;
    --primary-foreground: 0 0% 100%;
    
    --secondary: 0 0% 100% / 0.1;
    --secondary-foreground: 0 0% 95%;
    
    --muted: 0 0% 100% / 0.05;
    --muted-foreground: 0 0% 70%;
    
    --accent: 0 0% 100% / 0.1;
    --accent-foreground: 0 0% 95%;
    
    --destructive: 0 84% 60%;
    --destructive-foreground: 0 0% 100%;
    
    --success: 160 100% 37%;
    --success-foreground: 0 0% 100%;
    
    --warning: 40 100% 56%;
    --warning-foreground: 0 0% 0%;
    
    --border: 0 0% 100% / 0.1;
    --input: 0 0% 100% / 0.1;
    --ring: 204 80% 53%;
    
    --radius: 0.75rem;
    
    /* Priority Colors */
    --priority-high: 0 84% 60%;
    --priority-medium: 40 100% 56%;
    --priority-low: 160 100% 37%;
    
    /* Glass Effect */
    --glass-bg: 0 0% 0% / 0.6;
    --glass-border: 0 0% 100% / 0.1;
    --glass-blur: blur(10px);
    
    /* Shadows */
    --shadow-glass: 0 4px 30px rgba(0, 0, 0, 0.3);
    --shadow-glass-hover: 0 8px 40px rgba(0, 0, 0, 0.4);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "DM Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: linear-gradient(
        135deg,
        hsl(var(--gradient-peach)) 0%,
        hsl(var(--gradient-orange)) 33%,
        hsl(var(--gradient-maroon)) 66%,
        hsl(var(--gradient-black)) 100%
    );
    background-size: 400% 400%;
    animation: gradient-flow 20s ease infinite;
    color: hsl(var(--foreground));
    line-height: 1.5;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Animations */
@keyframes gradient-flow {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fade-in-down {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes scale-in {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slide-up {
    from {
        opacity: 0;
        transform: translateY(100px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Utility Classes */
.glass {
    background: hsl(var(--glass-bg));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid hsl(var(--glass-border));
}

.glass-light {
    background: hsl(0 0% 100% / 0.08);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid hsl(var(--glass-border));
}

.animate-fade-in-up {
    animation: fade-in-up 0.6s ease-out forwards;
}

.animate-fade-in-down {
    animation: fade-in-down 0.5s ease-out forwards;
}

.animate-fade-in {
    animation: fade-in 0.8s ease-out forwards;
}

.animate-scale-in {
    animation: scale-in 0.3s ease-out forwards;
}

.animate-slide-up {
    animation: slide-up 0.6s ease-out forwards;
}

.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }
.delay-500 { animation-delay: 0.5s; }
.delay-600 { animation-delay: 0.6s; }
.delay-700 { animation-delay: 0.7s; }

.hover-lift {
    transition: transform 0.2s, box-shadow 0.2s;
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glass-hover);
}

.hover-glow:hover {
    box-shadow: 0 0 20px hsl(var(--primary) / 0.3);
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    background: hsl(var(--glass-bg));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid hsl(var(--border));
    opacity: 0;
    animation: fade-in-down 0.5s ease-out forwards;
}

.header h1 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: hsl(var(--foreground));
    letter-spacing: -0.025em;
}

.navbar {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    color: hsl(var(--muted-foreground));
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.375rem 0.75rem;
    border-radius: 0.375rem;
    transition: color 0.2s, background 0.2s;
}

.nav-link:hover {
    color: hsl(var(--foreground));
    background: hsl(var(--secondary));
}

.nav-link.is-active {
    color: hsl(var(--primary));
}

/* Main Content */
.main {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

h2 {
    margin: 0 0 1.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: hsl(var(--foreground));
    letter-spacing: -0.025em;
    opacity: 0;
    animation: fade-in-up 0.6s ease-out 0.2s forwards;
}

.dashboard {
    margin-bottom: 3rem;
}

/* Dashboard Cards */
.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: hsl(var(--glass-bg));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid hsl(var(--glass-border));
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    box-shadow: var(--shadow-glass);
    opacity: 0;
    animation: fade-in-up 0.6s ease-out forwards;
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card.delay-200 {
    animation-delay: 0.2s;
}

.stat-card.delay-300 {
    animation-delay: 0.3s;
}

.stat-card.delay-400 {
    animation-delay: 0.4s;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glass-hover);
}

.stat-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: hsl(var(--muted-foreground));
}

.stat-value {
    font-size: 2.25rem;
    font-weight: 700;
    color: hsl(var(--foreground));
    letter-spacing: -0.025em;
}

/* Dashboard Graphs */
.dashboard-graphs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.graph-card {
    background: hsl(var(--glass-bg));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid hsl(var(--glass-border));
    border-radius: var(--radius);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: var(--shadow-glass);
    min-height: 300px;
    opacity: 0;
    animation: fade-in-up 0.6s ease-out forwards;
    transition: transform 0.2s, box-shadow 0.2s;
}

.graph-card.delay-400 {
    animation-delay: 0.4s;
}

.graph-card.delay-500 {
    animation-delay: 0.5s;
}

.graph-card.delay-600 {
    animation-delay: 0.6s;
}

.graph-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glass-hover);
}

.graph-card-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: hsl(var(--foreground));
}

.graph-wrap {
    flex: 1;
    min-height: 220px;
    height: 220px;
    position: relative;
}

.graph-wrap canvas {
    display: block;
    max-width: 100%;
}

/* Tasks Section */
.tasks-section {
    margin-top: 3rem;
}

/* Search Container */
.search-container {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: hsl(var(--glass-bg));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid hsl(var(--glass-border));
    border-radius: var(--radius);
    box-shadow: var(--shadow-glass);
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    color: hsl(var(--muted-foreground));
    pointer-events: none;
    z-index: 1;
}

.search-input {
    width: 100%;
    padding: 0.625rem 2.5rem 0.625rem 2.75rem;
    font-size: 0.875rem;
    font-family: inherit;
    background: hsl(var(--input));
    border: 1px solid hsl(var(--border));
    border-radius: var(--radius);
    color: hsl(var(--foreground));
    transition: border-color 0.2s, box-shadow 0.2s;
}

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

.search-input:focus {
    outline: none;
    border-color: hsl(var(--primary));
    box-shadow: 0 0 0 3px hsl(var(--primary) / 0.1);
}

.btn-clear-search {
    position: absolute;
    right: 0.75rem;
    display: none;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    padding: 0;
    background: transparent;
    border: none;
    color: hsl(var(--muted-foreground));
    cursor: pointer;
    border-radius: 50%;
    transition: color 0.2s, background 0.2s;
    z-index: 1;
}

.btn-clear-search:hover {
    color: hsl(var(--foreground));
    background: hsl(var(--secondary));
}

.btn-clear-search svg {
    width: 16px;
    height: 16px;
}

.task-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1rem;
}

.task-card {
    background: hsl(var(--glass-bg));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid hsl(var(--glass-border));
    border-radius: var(--radius);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    box-shadow: var(--shadow-glass);
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    opacity: 0;
    animation: fade-in-up 0.6s ease-out forwards;
}

.task-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glass-hover);
    border-color: hsl(var(--border));
}

.task-card.priority-high {
    border-left: 4px solid hsl(var(--priority-high));
}

.task-card.priority-medium {
    border-left: 4px solid hsl(var(--priority-medium));
}

.task-card.priority-low {
    border-left: 4px solid hsl(var(--priority-low));
}

.task-card h3 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: hsl(var(--foreground));
}

.task-desc {
    font-size: 0.875rem;
    color: hsl(var(--muted-foreground));
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
}

.task-desc.expanded {
    -webkit-line-clamp: unset;
}

.btn-see-more {
    background: none;
    border: none;
    padding: 0;
    color: hsl(var(--primary));
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    margin-top: 0.25rem;
    display: none;
    transition: text-decoration 0.2s;
}

.btn-see-more:hover {
    text-decoration: underline;
}

.task-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: hsl(var(--muted-foreground));
    margin-top: auto;
    padding-top: 0.5rem;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    border-radius: 0.375rem;
    font-weight: 500;
    font-size: 0.75rem;
}

.badge-priority-high {
    background: hsl(var(--priority-high) / 0.2);
    color: hsl(var(--priority-high));
}

.badge-priority-medium {
    background: hsl(var(--priority-medium) / 0.2);
    color: hsl(var(--priority-medium));
}

.badge-priority-low {
    background: hsl(var(--priority-low) / 0.2);
    color: hsl(var(--priority-low));
}

.badge-status {
    background: hsl(var(--primary) / 0.2);
    color: hsl(var(--primary));
}

.task-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid hsl(var(--border));
}

.task-actions select {
    padding: 0.35rem 0.6rem;
    font-size: 0.75rem;
    border-radius: 0.375rem;
    border: 1px solid hsl(var(--border));
    background: hsl(var(--glass-bg));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    color: hsl(var(--foreground));
    cursor: pointer;
    transition: border-color 0.2s;
}

.task-actions select:focus {
    outline: none;
    border-color: hsl(var(--primary));
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    font-family: inherit;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

.btn-primary {
    background: hsl(var(--primary));
    color: hsl(var(--primary-foreground));
}

.btn-primary:hover {
    background: hsl(var(--primary) / 0.9);
    box-shadow: 0 0 20px hsl(var(--primary) / 0.3);
}

.btn-secondary {
    background: hsl(var(--secondary));
    color: hsl(var(--secondary-foreground));
    border: 1px solid hsl(var(--border));
}

.btn-secondary:hover {
    background: hsl(var(--secondary) / 0.8);
}

.btn-outline {
    background: transparent;
    color: hsl(var(--foreground));
    border: 1px solid hsl(var(--border));
}

.btn-outline:hover {
    background: hsl(var(--secondary));
}

.btn-danger {
    background: transparent;
    color: hsl(var(--destructive));
    border: 1px solid hsl(var(--destructive));
}

.btn-danger:hover {
    background: hsl(var(--destructive) / 0.1);
}

.btn-sm {
    padding: 0.35rem 0.7rem;
    font-size: 0.75rem;
}

/* Spinner Animation */
@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.spinner {
    display: none;
    width: 14px;
    height: 14px;
    border: 2px solid transparent;
    border-top: 2px solid #E75800;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

.spinner.visible {
    display: inline-block;
}

.btn-summarize {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-summarize .btn-text {
    display: inline-block;
}

.btn-summarize.loading .btn-text {
    display: none;
}

.btn-summarize.loading {
    opacity: 0.7;
    cursor: not-allowed;
    pointer-events: none;
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
}

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

.modal {
    background: hsl(var(--glass-bg));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid hsl(var(--glass-border));
    border-radius: var(--radius);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-glass);
    transform: scale(0.95);
    opacity: 0;
    transition: transform 0.3s ease-out, opacity 0.3s ease-out;
}

.modal-overlay.is-open .modal {
    transform: scale(1);
    opacity: 1;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid hsl(var(--border));
}

.modal-header h2 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: hsl(var(--foreground));
    animation: none;
    opacity: 1;
}

.btn-close {
    background: none;
    border: none;
    color: hsl(var(--muted-foreground));
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.25rem;
    transition: color 0.2s;
}

.btn-close:hover {
    color: hsl(var(--foreground));
}

#taskForm {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.35rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: hsl(var(--muted-foreground));
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    font-family: inherit;
    border: 1px solid hsl(var(--border));
    border-radius: 0.5rem;
    background: hsl(var(--glass-bg));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    color: hsl(var(--foreground));
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: hsl(var(--primary));
}

.description-row {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.description-row .btn {
    align-self: flex-start;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid hsl(var(--border));
}

/* Toast */
.toast {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 0.75rem 1.25rem;
    background: hsl(var(--glass-bg));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid hsl(var(--glass-border));
    border-radius: 0.5rem;
    box-shadow: var(--shadow-glass);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.2s, opacity 0.2s, visibility 0.2s;
    z-index: 1100;
    color: hsl(var(--foreground));
}

.toast.is-visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    visibility: visible;
}

.toast.error {
    border-color: hsl(var(--destructive));
}

.toast.success {
    border-color: hsl(var(--success));
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    color: hsl(var(--muted-foreground));
    background: hsl(var(--glass-bg));
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid hsl(var(--glass-border));
    border-radius: var(--radius);
    opacity: 0;
    animation: fade-in 0.8s ease-out forwards;
}