@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

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

:root {
    --bg-gradient: radial-gradient(circle at 50% 0%, #1e1b4b 0%, #0f172a 100%);
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --success: #10b981;
    --danger: #ef4444;
    --input-bg: rgba(15, 23, 42, 0.6);
    --input-border: rgba(255, 255, 255, 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--card-border);
    backdrop-filter: blur(8px);
}

header nav {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header nav a {
    font-weight: 700;
    font-size: 1.25rem;
    text-decoration: none;
    color: var(--text-primary);
    letter-spacing: -0.025em;
    background: linear-gradient(to right, #818cf8, #34d399);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

main {
    flex: 1;
    padding: 3rem 2rem;
    max-width: 680px;
    margin: 0 auto;
    width: 100%;
}

footer {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--card-border);
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    backdrop-filter: blur(8px);
}

/* Auth Layout (kept for administrative route compatibility) */
.auth {
    max-width: 400px;
    margin: 2rem auto;
    padding: 2.5rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    backdrop-filter: blur(12px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
}
.auth h1 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}
.auth label {
    display: block;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}
.auth input {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    margin-top: 0.5rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.2s;
}
.auth input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.2s;
}
.btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-green {
    background: var(--success);
}
.btn-green:hover {
    background: #059669;
    box-shadow: 0 0 12px rgba(16, 185, 129, 0.35);
}

.error {
    color: #fca5a5;
    margin-bottom: 1.5rem;
    padding: 0.75rem 1rem;
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 8px;
    font-size: 0.875rem;
}

/* Todo Container & Cards */
.todo-container {
    width: 100%;
}

.todo-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    backdrop-filter: blur(12px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.todo-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.todo-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.todo-count {
    background: rgba(16, 185, 129, 0.12);
    color: #34d399;
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

/* Todo Form & Inputs */
.todo-input-form {
    display: flex;
    gap: 0.75rem;
}

.todo-input {
    flex: 1;
    padding: 0.85rem 1.25rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.2s;
}

.todo-input::placeholder {
    color: #64748b;
}

.todo-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
}

.todo-add-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3.2rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.todo-add-btn:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

.todo-add-btn:active {
    transform: scale(0.95);
}

/* Todo List Row & Items */
.todo-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.todo-item-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    transition: all 0.2s;
}

.todo-item-row:hover {
    background: rgba(30, 41, 59, 0.6);
    border-color: rgba(255, 255, 255, 0.06);
    transform: translateX(2px);
}

.todo-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.35rem;
    height: 1.35rem;
    border-radius: 50%;
    border: 2px solid var(--text-secondary);
    background: transparent;
    cursor: pointer;
    color: #fff;
    transition: all 0.2s;
    padding: 0;
    flex-shrink: 0;
}

.todo-toggle-btn:hover {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.todo-item-row.completed .todo-toggle-btn {
    background: var(--success);
    border-color: var(--success);
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.4);
}

.todo-text {
    flex: 1;
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: all 0.2s;
}

.todo-item-row.completed .todo-text {
    text-decoration: line-through;
    color: var(--text-secondary);
}

.todo-delete-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.25rem;
}

.todo-item-row:hover .todo-delete-btn {
    opacity: 1;
}

.todo-delete-btn:hover {
    color: var(--danger);
    transform: scale(1.1);
}

/* Empty State */
.todo-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 3rem 1rem;
    text-align: center;
    color: var(--text-secondary);
}

.todo-empty svg {
    color: var(--text-secondary);
    opacity: 0.4;
}

.todo-empty p {
    font-size: 0.95rem;
    font-weight: 500;
}

/* Error page formatting */
.error-page { text-align: center; padding: 3rem 0; }
.error-page h1 { margin-bottom: 0.5rem; }
.error-page a { color: var(--text-primary); }