:root {
    --bg: #0f172a;
    --card-bg: rgba(255, 255, 255, 0.03);
    --accent: #38bdf8;
    --success: #22c55e;
    --text: #f1f5f9;
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    background-color: var(--bg);
    background-image: 
        radial-gradient(at 0% 0%, rgba(56, 189, 248, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(34, 197, 94, 0.1) 0px, transparent 50%);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    min-height: 100vh;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    letter-spacing: -1px;
}

h1 span {
    color: var(--accent);
    font-weight: 300;
    margin-left: 10px;
}

/* Input Area */
.controls {
    margin-top: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 10px;
}

input {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    color: white;
    width: 300px;
    outline: none;
    transition: 0.3s;
}

input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.2);
}

button {
    background: var(--accent);
    color: var(--bg);
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
}

button:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

/* Kanban Board Layout */
.board {
    display: flex;
    justify-content: center;
    gap: 2rem;
    align-items: flex-start;
}

.column-wrapper {
    width: 350px;
}

h2 {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
    opacity: 0.7;
    padding-left: 0.5rem;
}

.column {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1rem;
    min-height: 600px;
    transition: background 0.3s;
}

/* Task Cards */
.task-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    padding: 1.2rem;
    border-radius: 12px;
    margin-bottom: 1rem;
    cursor: grab;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    animation: fadeIn 0.4s ease-out;
}

.task-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent);
    transform: scale(1.02);
}

.task-card p {
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: 0.5rem;
}

.task-card span {
    font-size: 0.75rem;
    color: var(--accent);
    opacity: 0.8;
}

/* Dragging State */
.task-card.dragging {
    opacity: 0.5;
    transform: rotate(3deg);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}