.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    font-size: var(--font-size-base);
    gap: 10px;
    width: 100%;
    position: relative;
    overflow: hidden;
}

.btn:active {
    transform: scale(0.96);
}

.icon-btn {
    background: transparent;
    border: none;
    color: inherit;
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

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

.btn-primary {
    background: var(--grad-electric);
    color: var(--text-on-primary);
    box-shadow: var(--shadow-blue);
    position: relative;
    z-index: 1;
}

.btn-primary:after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--grad-lava);
    opacity: 0;
    transition: opacity 0.4s;
    z-index: -1;
    border-radius: inherit;
}

.btn-primary:hover {
    box-shadow: var(--shadow-orange);
    transform: translateY(-3px) scale(1.02);
}

.btn-primary:hover:after {
    opacity: 1;
}

.btn-secondary {
    background-color: var(--surface-color);
    color: var(--text-primary);
    border: 1px solid var(--text-light);
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

/* Inputs */
.input-group {
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.input-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--primary-light);
}

.input-field {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: var(--font-size-base);
    transition: all 0.3s;
    background: var(--surface-color);
}

.input-field:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(0, 174, 239, 0.15);
}

/* Cards */
.card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 24px;
    padding: 28px;
    box-shadow: var(--shadow-premium);
    border: 1px solid var(--glass-border);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.2);
    border-color: var(--accent-color);
}

.glass-card {
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.4);
}

/* Header */
.app-header {
    background: var(--grad-electric);
    color: white;
    padding: calc(var(--spacing-sm) + 8px) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 10px 30px rgba(0, 59, 145, 0.2);
    border-bottom: 2px solid var(--secondary-accent);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Lists */
.list-item {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Floating Action Button */
.fab {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 64px;
    height: 64px;
    border-radius: 24px;
    background: var(--grad-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 15px 30px rgba(0, 59, 145, 0.3);
    border: none;
    cursor: pointer;
    z-index: 100;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    animation: fabPulse 2s infinite;
}

.fab:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 20px 40px rgba(0, 59, 145, 0.4);
}

@keyframes fabPulse {
    0% {
        box-shadow: 0 0 0 0 rgba(0, 59, 145, 0.4);
    }

    70% {
        box-shadow: 0 0 0 15px rgba(0, 59, 145, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(0, 59, 145, 0);
    }
}

@media (max-width: 640px) {
    .app-header {
        flex-direction: row;
        /* Force row layout */
        justify-content: space-between;
        align-items: center;
        gap: 8px;
        padding: 10px 16px;
    }

    .app-header h3 {
        font-size: 16px;
        margin: 0;
        max-width: none;
        /* Allow more space */
    }

    .app-header small {
        display: block;
        font-size: 11px;
    }

    .input-group.flex.gap-md {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}